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Box Build Assembly Companies

Last updated: January 2026

This directory lists 112 box build assembly companies across the United States, from specialized boutique shops to full-service EMS providers.

Companies typically seek box build assembly partners to consolidate their supply chain, transitioning from managing multiple discrete component vendors (for PCBs, custom sheet metal, plastics, wire harnesses) to a single point of accountability for the entire product. This move is driven by the desire to streamline logistics, accelerate time-to-market, and leverage a supplier's expertise in Design for Manufacturability (DFM) for mechanical integration, comprehensive BOM scrubbing, and efficient final functional testing (FFT) setup.

Supplier types in this sector range significantly, from smaller, agile contract manufacturers specializing in low-volume, high-mix (LVHM) prototyping and niche industrial applications, to large, vertically integrated Electronics Manufacturing Services (EMS) providers capable of high-volume, low-mix (HVLM) production for complex consumer or medical devices. The key differentiator often lies in their core competencies: some excel in electro-mechanical assembly and custom enclosure integration, while others primarily scale up PCBA-centric builds with minimal mechanical complexity.

Buyers approaching these suppliers should arrive prepared with a comprehensive data package. This includes detailed 3D CAD models for enclosures, full Bills of Materials (BOM) with approved manufacturers and part numbers, clear assembly instructions with visual aids, and detailed specifications for final functional testing. Suppliers, in turn, expect a thorough understanding of your product's intended market, expected volume ramp, and critical quality requirements to accurately scope and quote the project.

112 companies·90 emails·105 phones

Company Directory

112 companies nationwide

Elgin, IL

Based in Elgin, IL, A2Z EMS specializes in box build assembly services, offering complete product integration for USA businesses. They provide mechanical assembly, wiring, and enclosure fabrication, alongside custom kitting and packaging. The company supports flexible low-to-mid volume and high mix assemblies, ensuring quality and precision.

Dayton, OH

Based in Dayton, OH, ADCURA specializes in low to high volume contract manufacturing for electromechanical and panel/box build assemblies. They provide custom wire, cable, and wire harness assemblies, prototyping, and kitting solutions. Capabilities include electrical box enclosures and panel build and assembly services.

Webster, TX

Based in Webster, TX, Alert Tech SMT is a full-stack electronics manufacturer providing turnkey PCB assembly and comprehensive box build services. They manage the entire process, from parts sourcing and procurement to assembly and rigorous quality assurance, leveraging extensive in-house capabilities for sophisticated systems.

Lathrop, CA

Alteraflex provides comprehensive PCB assembly services, utilizing surface mount (SMT), through-hole, and mixed technology manufacturing. Based near Lathrop, CA, the company offers these services with fast delivery times, including its PCB assembly operations in Toledo, Ohio.

Thousand Oaks, CA

Based in Thousand Oaks, CA, Altraco is a contract manufacturer specializing in outsourced production of products and components. They help companies in various sectors, including aerospace and consumer electronics, optimize operations and reduce costs. Altraco leverages California's industrial ecosystem and cutting-edge technology for manufacturing solutions.

Akron, OH

Based in Akron, OH, Anzer USA provides comprehensive PCB box-build assembly services. They integrate and assemble electronic and non-electronic components into complete product enclosures, covering PCB, mechanical, and cabling integration. With over three decades of experience, Anzer also manages component procurement for various electronic devices and systems.

Hampshire, IL

Based in Hampshire, IL, American Precision Assemblers, Inc. specializes in electronic box build assembly services. Certified to ISO 9001:2015 and AS9100D, they integrate components into various enclosure types like die castings and sheet metal. Serving industrial vehicles and automotive testing systems, they manage production from prototypes to high volume.

San Diego, CA

AP Precision Metals, Inc., based in San Diego, CA, is a full-service metal fabricator specializing in a range of services including cutting, welding, painting, and finishing. They provide comprehensive assembly and kitting services, fulfilling OEM supply requirements for various industrial customers, focusing on quality assurance.

Austin, TX

Based in Austin, TX, Arctos Assembly provides full built-to-print contract manufacturing services. They specialize in system-level assemblies (box builds), sub-assemblies, and PCB assemblies, offering end-to-end solutions. The company supports product manufacturing from prototype to full production builds with flexible scale and quick turnaround.

College Station, TX

ARQ Electronics Manufacturing Services, Inc., based in College Station, TX, offers comprehensive electronics manufacturing services. Specializing in electrical and mechanical design and development engineering, the company aims to be a full-service partner, exceeding client expectations for quality, schedule, and cost. It is ISO 9001:2015 certified.

Brenham, TX

Based in Brenham, TX, Bencor LLC specializes in precision PCB assembly and custom box build contract manufacturing. They offer final assembly services, adhering to IPC Class III or higher standards for various demanding industries. Bencor serves sectors like medical, aerospace, military, industrial controls, and outer space exploration across the United States.

Houston, TX

Based in Houston, TX, Best Industrial Services provides a wide array of fabrication and assembly capabilities. The company meets the diverse needs of various industries across Texas, offering comprehensive solutions for industrial clients requiring custom manufacturing and final product assembly.

Northbrook, IL

Blind Buried Circuits, based in Northbrook, IL, offers comprehensive electronic manufacturing services. The company specializes in PCB assembly, cable and wire harness assembly, and box build assembly. They also provide design engineering, prototyping, and inventory management solutions for various industries.

Carson, CA

Based in Carson, CA, ACME PCB Assembly specializes in electronic box build and assembly services. They provide full turnkey solutions, covering purchasing, electronics engineering, contract manufacturing, and testing for tabletop box builds. Their capabilities include enclosure fabrication, cable/wire harness installation, and sub-assembly integration, alongside comprehensive PCB assembly services.

Botkins, OH

Based in Botkins, OH, Buckeye Electrical provides complete box build assembly services, including both electrical and mechanical assemblies. They offer turnkey solutions or can build with customer-supplied materials. The company also specializes in PC board and cable harness manufacturing, functionally testing all finished box builds before shipping.

Santa Ana, CA

Based in Santa Ana, CA, Cal Quality Electronics offers complete turnkey manufacturing and testing solutions for system and box build requirements. With 30 years of experience, they dedicate 30% of their facility to these builds, serving medical, industrial, military, aerospace, and computing industries.

Tipp City, OH

Based in Tipp City, OH, Captor Corporation specializes in military electromechanical assembly solutions, including box building, custom electrical control panels, and integrated systems production. They leverage precision manufacturing and engineering expertise to deliver turn-key build to print applications that meet stringent military standards and client specifications.

Irvine, CA

Based in Irvine, CA, Carr Manufacturing Company (CMC) is a women-owned business specializing in custom electro-mechanical and box build assemblies. They provide Electronic Manufacturing Services (EMS), supporting cable assembly and electronic device integration. CMC handles low-volume, high-mix prototype projects and is ITAR compliant.

Hillsboro, OR

Based in Hillsboro, OR, Cascade Systems Technology provides comprehensive box build electronics and manufacturing services. They offer design for manufacturing feedback, tooling evaluation, and detailed documentation. Capabilities include final assembly, functional testing, on-board/off-board programming, and robust supply chain management. They also provide cable and harness assembly services.

Jacksonville, IL

Based in Jacksonville, IL, CCK Automations, LLC. offers full-service box-build assembly, integrating various components into finished products ready for deployment. They provide customized solutions, utilizing optimized work cells for complex designs. Services also include automated PCB assembly, conformal coatings, and injection molding to support product lifecycles.

Hamden, CT

Based in Hamden, CT, CIC is a veteran-owned electronics manufacturing services provider, established in 1994. They specialize in box build, PCB, and cable & harness assembly, offering quality control, testing, and inventory management. CIC serves industrial instrumentation, energy, communications, aerospace, and medical sectors.

Boston, MA

Creation Technologies is an Electronics Manufacturing Services (EMS) provider based in Boston, MA. Specializing in high-reliability applications, they serve aerospace & defense, medical & life sciences, and tech industrial markets. The company offers comprehensive manufacturing and engineering solutions, including new product introduction and aftermarket services.

Hillsboro, OR

Based in Hillsboro, OR, Custom Contract Manufacturing specializes in box build assembly services, custom cable and wire harness assembly, and electronic, mechanical, and electronics assembly. The company supports projects from prototypes to high-volume production, offering flexible and responsive solutions to meet diverse customer needs.

Leander, TX

Based in Leander, TX, Cypress Technologies provides comprehensive electronics manufacturing services. Capabilities include precision assembly of printed circuit boards, box builds, cable harnesses, and panel assemblies. They specialize in electromechanical integration and full-scale contract manufacturing, serving alternative energy, oil & gas, military, autonomous vehicles, and robotics industries.

Georgetown, TX

Based in Georgetown, TX, Deaton Engineering, Inc. offers contract manufacturing and engineering services. They specialize in low-volume, build-to-order assembly, supporting product development through alpha and beta phases with skilled in-house technicians. The company also provides turnkey design services, preparing products for high-volume transition.

Oakland, CA

Based in Oakland, CA, Digicom Electronics specializes in PCB assembly, prototypes, and box-builds. They provide secure and precise builds for critical electronic systems, serving demanding sectors like aerospace, defense, medical devices, industrial automation, and telecommunications.

San Jose, CA

Based in San Jose, CA, Epoch International is an electronics manufacturing services company offering a full spectrum of services from concept to mass production. They provide design, engineering, prototyping, SMT assembly, precision testing, and supply chain management. The company serves diverse industries including medical, mobile devices, automotive, and industrial automation.

Des Moines, IA

Based in Des Moines, IA, ETI Manufacturing provides complete box build assembly solutions. They help clients reduce supply chain risk and meet rigorous standards for various electronic applications. Their manufacturing services encompass the full scope of box build, ensuring high-quality and reliable final products.

Round Rock, TX

Based in Round Rock, TX, East/West Manufacturing Enterprises specializes in Box Build Manufacturing and Systems Integration. They provide complete assembly, testing, procurement, and material sourcing for projects, from electronic enclosures to cable harness assemblies. Serving industrial, medical, automotive, and aerospace & defense sectors, they offer end-to-end solutions.

Cranston, RI

Based in Cranston, RI, Federal Electronics is an EMS provider specializing in electronic box build assembly services. They offer vertical integration, managing complex supply chains and integrating lower-level assemblies into higher-level electronic controllers. With a US-Mexico manufacturing footprint, they serve OEMs producing high-complexity, highly engineered, and regulated products.

Brea, CA

Based in Brea, CA, Fineline Circuits & Technology Inc. provides box build and electro-mechanical assembly services. They offer partial or full product integration and final assemblies for end-users, complementing their PCBA operations. Services include complex cable and wire harness assembly, soldering, and precise torque requirements. They are ISO 9001:2015 certified.

Irwindale, CA

Based in Irwindale, CA, Fine Pitch Electronic Assembly specializes in PCB and full box-build assembly services for manufacturers. They assist with design, component selection, and the entire product build, installing circuit boards, components, wiring, and housing. Each unit undergoes inspection prior to shipment.

El Paso, TX

Based in El Paso, TX, First Texas Products offers a full range of electronics manufacturing and electromechanical assembly services. They provide consignment and complete turnkey manufacturing solutions, leveraging advanced equipment and a skilled workforce. Serving a wide range of industries, they efficiently produce all quantities from their US and Mexico facilities.

Jacksonville, IL

Based in Jacksonville, IL, Foxtronics EMS provides comprehensive box build assembly and system integration services. Capabilities include mechanical assembly, cable routing, enclosure integration, testing, and packaging. They deliver turnkey solutions, integrating PCBs and components into compact control units, rack-mounted systems, or industrial enclosures.

Huntsville, AL

Based in Huntsville, AL, Futaba EMS specializes in contract electronics manufacturing, offering both PCBA and full system integration. Their box build assembly services include enclosure assembly, cable and wire harness integration, sub-assembly, firmware installation, and system-level testing. They support industries such as aerospace, automotive, and medical devices.

San Jose, CA

Green Circuits Inc., based in San Jose, CA, provides comprehensive system box build assembly and integration services. They manage sub-assembly installation, cable assemblies, wiring harnesses, and enclosure fabrication for electronic applications. Capabilities include product assembly, functional testing, software loading, product configuration, packaging, and order fulfillment.

Rowlett, TX

Based in Rowlett, TX, H&S Manufacturing Co. provides electromechanical assembly and box build services. They manage component integration, from fabrication to complete final assembly including enclosures, handling prototype to large production volumes. Their AS9100D, ISO 9001:2015, and ITAR compliant facility serves diverse industries like military and medical.

San Marcos, CA

Based in San Marcos, CA, Hughes Circuits Inc. provides comprehensive box build and system-level assembly services. The company specializes in advanced microelectronics assembly, printed circuit board (PCB) fabrication, and precision metal fabrication. They serve industrial and commercial clients needing integrated electronic and mechanical assemblies.

Marina, CA

Based in Marina, California, INDTEC Corporation delivers turnkey box build assembly services, specializing in image acquisition systems. Their capabilities encompass complex PCB and in-house cable assembly, electromechanical integration, and developing 3D-2D build instructions. They provide expedited procurement and responsive support for industrial clients, including those in the semiconductor equipment industry.

Austin, TX

Based in Austin, TX, Kodiak Assembly Solutions provides flexible electronic manufacturing services. They specialize in turnkey system integration and box build assembly for complex devices, supporting high-mix PCB assembly from prototype to high-volume production. The company offers advanced testing, engineering support, and full material traceability. Kodiak is ISO 9001:2015 and ITAR certified.

San Leandro, CA

Based in San Leandro, CA, KS Group provides specialized contract manufacturing services. They offer plastic injection molding, product development, and comprehensive assembly, including cleanroom capabilities. With over 50 years of experience, they support clients from prototyping to delivering finished goods, serving highly regulated industries.

Mundelein, IL

Based in Mundelein, IL, Larsen Manufacturing provides end-to-end contract manufacturing and outsourced assembly. They offer full-scale mechanical and electrical assembly, wiring, testing, and customized packaging services. Leveraging precision metal fabrication, Larsen builds sub-assemblies or finished goods for medium to high volume production.

Brisbane, CA

LeeMAH Electronics specializes in electromechanical box build manufacturing and assembly services from facilities in California and Texas. Capabilities include custom programming, packaging, and extensive testing, such as hi-pot and functional. They serve industries like aerospace, medical devices, and industrial, maintaining ISO 9001:2015 and AS9100D certifications.

Columbus, OH

Based in Columbus, OH, Levison Enterprises provides electronic manufacturing services, including PCB assembly and streamlined turnkey manufacturing. They specialize in bringing products from concept to market, offering assistance with new designs and legacy product updates. The company also handles small runs and prototyping to identify issues early in production.

Columbus, OH

Based in Columbus, OH, ADL Technology specializes in complete PCBA design and manufacturing services, including cable and wire harness assemblies. They offer functional testing and final product assembly, providing comprehensive box build solutions. Their LEAN, ISO 9001:2015 certified facility supports high mix/high volume and prototype production.

Rosenberg, TX

Based in Rosenberg, TX, Martin Company offers electronics engineering, design, and manufacturing services. They provide PCB layout, firmware, prototyping, assembly, and testing for custom electronic systems. The ISO 9001 certified company delivers complete production services for diverse industries, including oil & gas, seismic, and security.

Milpitas, CA

Based in Milpitas, CA, Meritronics provides complete product assembly and box build assembly services. They handle electrical enclosures, power supplies, cable routing, packaging, labeling, testing, and software installation for full system integration. Meritronics also offers printed circuit board capabilities, programming, and integration, managing RMA throughout the product's lifecycle.

Glendale, WI

Based in Glendale, WI, Milwaukee Electronics is a full-service, vertically integrated electronics manufacturer. The company provides a complete range of electronics contract manufacturing services, including PCBA, subassembly, panel assembly, box build, and system integration solutions for various industries.

Garland, TX

Based in Garland, TX, NCA, Inc. is a U.S.A.-based PCBA contract manufacturer. They offer quick turn, prototype, small and production quantity services, including complete box build production, electro-mechanical assembly, and wire harness and cable assembly. They serve Defense/Aerospace, Medical, Telecommunications, and AI/Robotics sectors.

Sugar Land, TX

Based in Sugar Land, TX, Niltronix Circuits is an electronics manufacturing services provider specializing in box build assembly. The company offers comprehensive solutions including printed circuit board fabrication, PCB assembly, and various testing capabilities for B2B industrial and commercial clients.

Richardson, TX

NPI Technologies, based in Richardson, TX, is a contract electronic manufacturing company. They provide comprehensive services from prototyping to final product delivery, encompassing PCB assembly, box build, and testing. NPI emphasizes quality, transparency, and no minimum order requirements, partnering with diverse manufacturing businesses.

Lewisberry, PA

Based in Lewisberry, PA, Optima Technology Associates, Inc. provides comprehensive Printed Circuit Board Electronic Manufacturing Services (EMS). Offerings include engineering design, PCB fabrication and assembly, parts procurement, and functional testing. The company specializes in turnkey and box build assemblies, complemented by supply chain management for various technology fields.

Morgan Hill, CA

Based in Morgan Hill, CA, O&Y Precision, Inc. is a contract manufacturing partner specializing in complex full assemblies ready for shipment. Services encompass prototyping, machining, metal forming, testing, packaging, and fulfillment. The company supports industries such as aerospace, medical, and semiconductor.

Cleveland, OH

Based in Cleveland, OH, Paragon Robotics offers complete electronics manufacturing services, including PCB assembly and box-build assembly from their facility. They provide comprehensive testing, quality assurance, and engineering support for electronic products. The company holds certifications such as ITAR, AS9100, and ISO9001.

Orange County, CA

PARPRO specializes in complete electro-mechanical services, including box build, sub-assembly, and product manufacturing, offering an all-encompassing solution. They provide PCB assembly, custom cable and wire harnesses, precision machining, and sheet metal fabrication with full testing capabilities. PARPRO serves the aerospace & defense, industrial, EV, medical, communications, and computer & storage industries.

PEKO Precision provides U.S.-based, turnkey box build assembly services for OEMs manufacturing complex, highly regulated electromechanical systems. They integrate mechanical, electrical, and electronic components into complete, self-contained systems, spanning fabrication to full systems integration. PEKO serves industries including medical, defense, semiconductor, and renewable energy.

Rochester Hills, MI

Based in Rochester Hills, MI, PGF Technology Group provides comprehensive box build assembly and system integration services. They integrate various electronic components, subsystems, and modules into finished products within enclosures. Their capabilities include PCBA and cable assemblies, offering full turnkey manufacturing solutions for complex electromechanical collections.

Grove City, PA

Based in Grove City, PA, Pine Electronics, Inc. specializes in low-to-mid volume box build assemblies. They provide comprehensive electromechanical assembly services, including enclosure fabrication, sub-assembly installation, and precision routing of cabling and wire harnesses. Their box builds serve diverse industrial applications.

Nutley, NJ

Based in Nutley, NJ, PNC Online offers electronics manufacturing. With 50 years' experience in PCB assembly and wire harness, they directly provide mechanical or box assembly, programming, and functional testing. The company holds AS9100D, ISO-9001-2015, and ITAR certifications.

Poly Electronics offers comprehensive Box Build Assembly solutions, integrating custom or off-the-shelf cabinet housings with display, PCB assemblies, and wiring harnesses. They deliver fully functional, long-lasting, ready-to-integrate products designed to client specifications. Their services simplify BOM management and mitigate supply chain risks by providing all solutions under one roof.

Sugar Land, TX

Based in Sugar Land, TX, Premier Electronics specializes in PCB assembly, chassis/box builds, and cable/wire harnesses. They provide Tier 1 capabilities, manufacturing flexibility, and control material acquisition. Utilizing high-speed SMT lines, the company offers onshoring solutions, accelerating time to market for customers.

Roseville, CA

Based in Roseville, CA, PRIDE Industries offers customized electronics manufacturing services. Leveraging in-house SMTA Certified SMT Process Engineers and state-of-the-art facilities, the company focuses on streamlining production and enhancing product quality. They provide dependable electronics assembly, serving various industries with comprehensive manufacturing solutions.

Suwanee, GA

Prime EMS provides advanced Electronic Manufacturing Services (EMS), offering customized solutions from prototypes to turnkey management of product portfolios. Based in Suwanee, GA, their 50,000 sq. ft. facility features four precision SMT lines for manufacturing high-reliability electronics. They serve OEMs in markets like energy, medical, and military.

Santa Fe Springs, CA

Based in Santa Fe Springs, CA, Pro-Tech Design & Manufacturing, Inc. specializes in medical device contract assembly. They offer full-service final device production, packaging, and kitting within ISO 13485 certified, Class 10,000/ISO 7-rated cleanroom facilities. The company serves the medical industry from multiple US locations.

Gardena, CA

Based in Gardena, CA, Qual-Pro provides comprehensive PCBA manufacturing services, including expert PCB assembly and box build. They also offer cable assemblies, wire harnesses, conformal coating, and order fulfillment. Their engineering support encompasses DFX analysis and test development.

Anaheim, CA

Based in Anaheim, CA, Rapid Manufacturing is a global electronics manufacturing company. It specializes in custom-designed wire & cable harnesses, electro-mechanical, and box build assemblies for OEMs. The company offers engineering services, material management, and global support, delivering quality and cost-effective solutions.

Cincinnati, OH

Based in Cincinnati, OH, RB Tool & Manufacturing Company provides automated and box build assembly services. They build products such as packaging and automation systems, sound enclosures, food applications, gauges, and heaters. The ISO 9001:2015 certified and Woman-Owned company ensures all finished work is 100% inspected and tested.

Marlborough, MA

Richardson Electronics, Ltd. is a global manufacturer of engineered solutions. They specialize in creating custom display solutions for Original Equipment Manufacturers (OEMs), and design and manufacture unique energy storage solutions. The company provides value-added integration and assembly of complex systems, components, and finished products for diverse industrial applications.

Grand Prairie, TX

Based in Grand Prairie, TX, REYcomp provides electronic contract manufacturing services to the electro-mechanical industry. They specialize in automated circuit board assembly, offering thru-hole, SMT, and BGA technologies. The company also provides comprehensive Box Build assembly and testing for sectors including industrial, aerospace, and defense.

Lewiston, MN

Based in Lewiston, MN, RiverSide Integrated Solutions specializes in comprehensive box builds and full product assembly, integrating complex electromechanical systems. Capabilities include structural assembly, control panel installation, wiring, PCB integration, and power distribution. The company serves diverse industries such as medical devices, industrial equipment, telecommunications, and consumer electronics, offering tailored solutions.

Chagrin Falls, OH

Based in Chagrin Falls, OH, RPC Electronics provides electronic manufacturing services. They specialize in printed circuit board assembly, electromechanical assembly, and panel building. The company also offers custom wire harnessing and manufactures LCD displays and embedded computing systems, serving OEMs in industrial, medical, and commercial markets.

Milpitas, CA

Based in Milpitas, CA, Rush PCB provides comprehensive quick-turn PCB fabrication, PCB assembly, and box build assembly services. They offer customized solutions including cable assembly, sub-level product assembly, testing, custom enclosures, and final packaging from their facilities in California and Texas.

Winfield, KS

Based in Winfield, KS, S and Y Industries offers complete box-build and turnkey assembly solutions for custom electronic systems. They support projects from prototyping through production, performing final product assembly alongside precision testing and inspection services. Their IPC-A-610 certified staff and ISO-certified quality processes ensure reliable, functional assemblies.

Urbana, OH

Based in Urbana, OH, Sarica Manufacturing offers contract manufacturing and design support for customized electronics and electro-mechanical assemblies. Capabilities include circuit card assemblies and custom cable assemblies. The company serves the aerospace, defense, medical, industrial, and automotive sectors.

Anaheim, CA

SI Manufacturing, based in Anaheim, CA, provides custom electronics contract manufacturing services. They specialize in full turnkey box builds, PCB designs, and assemblies, alongside mechanical assembly and comprehensive electronic testing. The company serves demanding sectors like medical, railroad, aerospace, and defense applications.

Melbourne, FL

Based in Melbourne, FL, SMTC Corporation delivers end-to-end electronics manufacturing services. Capabilities encompass PCBA production, systems integration, comprehensive testing, and enclosure fabrication, covering the entire product life cycle from prototype to end-of-life. They serve various focused markets.

Rockledge, FL

Based in Rockledge, FL, Solutions Manufacturing, Inc. provides comprehensive box build assembly, electro-mechanical assembly, and complete system integration services. They offer automated conformal coating, encapsulation, and product testing, delivering full turnkey solutions tailored to customer-specific design, form factor, and packaging requirements.

Fremont, CA

Based in Fremont, CA, Sonic Manufacturing Technologies offers a complete range of electronic manufacturing services. The company provides comprehensive solutions from New Product Introduction (NPI) to supply chain management, ensuring efficient and high-quality production for various electronic components and assemblies, including box build services.

Buffalo, NY

Based in Buffalo, NY, SoPark offers precision box build and module assembly services, supporting kitted and turnkey projects. Certified to ISO 9001, ISO 13485, and AS 9100D, and ITAR registered, they provide quick turn capabilities, testing, DFM, and flexible production.

Watertown, SD

Based in Watertown, SD, Spartronics provides contract manufacturing services, including printed circuit board assemblies, subsystem integration, and full-box builds. They serve highly-regulated markets such as commercial aerospace, defense, medical devices, life sciences, instrumentation and control, and space with comprehensive electronic manufacturing solutions.

Round Rock, TX

Based in Round Rock, TX, Special Products & Mfg., Inc. provides precision sheet metal fabrication, CNC machining, laser cutting, welding, and electro-mechanical assembly services. They operate multiple facilities in Texas, focusing on contract manufacturing for mechanical products and assemblies.

Madison, AL

Based in Madison, AL, STI Electronics, Inc. specializes in electronic manufacturing services, providing end-to-end solutions for circuit card assemblies and box builds. They offer full-service capabilities from design to full production, including PCB assembly, rigorous testing, DFM/DFT analysis, and integrated logistics.

Anaheim, CA

Based in Anaheim, CA, Technotronix provides electronic manufacturing services for OEMs, specializing in PCB fabrication, manufacturing, design, and comprehensive testing of circuit board assemblies. They offer quick-turn PCB assembly, prototyping, and integrate Design for Manufacturability (DFM) principles. The company serves industrial and medical sector clients.

Perry, OH

Based in Perry, OH, TT Electronics provides comprehensive manufacturing services including box build, high-level assembly, SMT lines, and cable harness assembly. They serve the Aerospace, Defense, Healthcare, and Industrial sectors, offering NPI and test solutions from their 11,148 SQM facility.

Houston, TX

Based in Houston, TX, UPG International specializes in value-added assemblies and contract manufacturing. They assemble critical products, including plastics, metal, PCAs, cables, and LCD screens, for diverse industrial markets. Offering both automated and manual assembly for electro-mechanical devices and sub-assemblies, they also integrate comprehensive testing solutions.

Austin, TX

Based in Austin, TX, VIRTEX is an electronic contract manufacturer offering comprehensive Electronic Manufacturing Services (EMS). Their integrated solutions include printed circuit assembly, cable and harness manufacturing, and system integration. VIRTEX serves market sectors like military & aerospace, medical, and industrial clients.

Akron, OH

Based in Akron, OH, WRC Akron is an ISO 9001:2015 and AS9100D certified provider of electronics design and manufacturing services. They offer turn-key, custom engineered solutions for Original Equipment Manufacturers (OEMs), specializing in Embedded Control and Industrial Internet of Things (IIoT) technology for various electronic products.

Carson, CA

Based in Carson, CA, Yun Industrial provides turnkey box build assembly and full electro-mechanical manufacturing. They support projects from design conception and prototyping through volume production, offering comprehensive solutions, including PCB integration, wiring, and testing, to meet specific requirements.

Phelps, NY

Based in Phelps, NY, Z-AXIS Inc. provides electronic product design and contract electronics manufacturing services. They specialize in box build assembly projects, producing systems from miniature custom power supplies to sophisticated units with multiple integrated printed circuit boards and cable assemblies.

Lincoln, AR

Based in Lincoln, Arkansas, EMS, Inc. provides comprehensive electronic manufacturing services. With over 19 years of experience, they specialize in reliable box build and electro-mechanical assembly for turnkey manufacturing. Capabilities include PCB design, assembly, and cable and wire harness assembly, serving diverse industrial clients.

Batavia, OH

Based in Batavia, OH, Spectra-Tech Manufacturing Inc. provides comprehensive Electronic Manufacturing Services (EMS). The company handles all components, from PCB manufacturing to PCB assembly. They aim to be a long-term manufacturing partner, offering solutions for various EMS applications and integrating complete electronic product builds.

Torrington, CT

Based in Torrington, CT, Altek Electronics, Inc. provides Box Build Assembly and System Integration services, with over 40 years of experience. They handle mechanical assembly, integrating PCB assemblies, cables, and control panels. Altek serves industrial, commercial, medical, telecommunications, and aerospace markets, offering full product integration solutions.

Montello, WI

Based in Montello, WI, Arimon provides full electrical and mechanical box build assembly contract manufacturing services for OEMs. They offer design, engineering, prototypes, and samples. Their facilities are UL Listed/Recognized and ISO 9001:2015 certified, conforming to IPC A-610, A-620, and A-630 standards.

Ephrata, PA

Based in Ephrata, PA, Astro Machine Works provides comprehensive contract manufacturing services for industries such as aerospace, electronics, medical, food and beverage, and robotics. With over three decades of experience and state-of-the-art equipment, they deliver scalable and reliable manufacturing solutions for both simple and complex projects.

Mckinney, TX

Based in McKinney, TX, Broach Bilt Manufacturing, Inc. is an ISO 9001 certified electronic manufacturing service provider. They specialize in circuit board assembly, cable assembly, programming, testing, box builds, and component sourcing, supporting projects from prototypes to full-scale production.

Orange County, CA

Based in Orange County, CA, CEM: Complete Electronics Manufacturing provides comprehensive electronics manufacturing services. They specialize in PCB assembly, handling projects from prototype to full production runs. With over 30 years of experience, the company serves diverse industries including medical devices, aerospace, industrial controls, and consumer electronics.

Reynoldsburg, OH

Based in Reynoldsburg, OH, Dynalab EMS, Inc. is a full-service electronic manufacturing services provider. Operating a 100,000 square foot facility, they specialize in printed circuit board assembly and full system box builds. Dynalab offers customized supply chain management and dedicated production lines for high volume manufacturing.

Jabil Inc. is an engineering-led, supply chain-enabled manufacturing company providing vertically integrated solutions for product design, build, and delivery. They offer services like design engineering, supply chain management, and various manufacturing models, including Build to Order, supporting diverse industries with complex assembly requirements globally.

Jasper, IN

Based in Jasper, IN, Kimball Electronics is an Electronics Manufacturing Services (EMS) provider. They specialize in full system complex builds, sub-assembly, and surface mount technology. Capabilities also include rapid prototyping, labeling, and packaging services for the healthcare, industrial, and automotive industries.

Chicago, IL

Based in Chicago, IL, Methode Electronics, Inc. is a global supplier of custom-engineered solutions. The company designs, engineers, and produces mechatronic products for original equipment manufacturers (OEMs). They utilize various technologies including user interface and LED solutions, with manufacturing facilities globally.

Chantilly, VA

Based in Chantilly, VA, MFG One provides comprehensive box build assembly manufacturing support, integrating electronic, mechanical, and software elements into ready-to-ship systems. The company also specializes in high-precision printed circuit board assembly, custom plastic injection molding for enclosures, and efficient mold tooling.

NEOTech provides comprehensive electronic manufacturing services for high-tech OEMs, offering solutions to bring advanced product visions to reality. Operating with U.S. and Mexico-based facilities, the company supports customers in developing cutting-edge technology. They deliver expertise and commitment to quality, focusing on building long-term partnerships for critical electronic systems.

NPI Services Inc. specializes in contract manufacturing, providing box build assembly services for various products. They manage both simple PCBA enclosures and complex box builds with multiple components. The company processes assemblies across diverse physical sizes and complexities for their clients.

Garrett, IN

Based in Garrett, IN, Prince Manufacturing provides comprehensive contract assembly services. They specialize in sub-assembly, final assembly, rigorous testing, and inspection processes. The company also offers efficient packaging and shipping solutions, aiming to streamline clients' production with decades of experience.

Wooster, OH

Based in Wooster, OH, RBB Systems specializes in complex printed circuit board assemblies (PCBA) and control panel projects. The company partners with manufacturers, providing comprehensive solutions for intricate electronic assemblies. They focus on delivering high-quality, reliable integration services for diverse industrial applications.

Baltimore, MD

Zentech Manufacturing, an EMS company, operates facilities in Maryland, Texas, and Illinois. They specialize in high-complexity, high-reliability circuit card and higher-level electromechanical assemblies. Serving the defense, aerospace, and medical industries, Zentech provides comprehensive manufacturing, inspection, and test services for mission-critical products.

Circuit Assembly provides complete, turnkey box build assembly services. The company specializes in integrating electronic components, sub-assemblies, and enclosures into a final product. They offer comprehensive manufacturing solutions, managing the full assembly process for their clients.

ACTIA EMS provides Electronic Manufacturing Services (EMS) in the United States, specializing in on-board electronic systems. As part of the international ACTIA group, they design and manufacture solutions for connected, safe, and sustainable mobility, serving demanding customer environments.

Evolve Manufacturing operates a 75,000 sq ft facility in Silicon Valley, specializing in the manufacturing of complex medical and life sciences devices and instruments. The company provides comprehensive services for advanced products, including box build assembly and integration, for these critical industries.

GTR Manufacturing provides electromechanical box build assembly services, handling projects from routine to highly complex. The company offers in-house chassis population and rigorous testing for assembled products, ensuring quality for various industrial and commercial clients.

Santa Clara, CA

Based in Santa Clara, CA, Venture Electronics provides comprehensive electronics manufacturing services (EMS), including full turnkey box build assembly. Capabilities encompass mechanical assembly, sub-assembly, product configuration, testing, and system integration. They deliver complete build box solutions for various enclosure types, from simple plastic to complex metal-ceramic designs.

Anaheim, CA

Based in Anaheim, CA, Vinatronic Inc. provides comprehensive Electronic Manufacturing Services (EMS). They specialize in the full lifecycle of electronic product manufacturing, from PCBA and sub-assembly to final box build assembly. Services include surface mount, thru-hole PCB assembly, cable and wire harness, plus integrated test services.

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How to Choose a Company

  • Assess their Design for Manufacturability (DFM) and Design for Test (DFT) capabilities specifically for electro-mechanical and system-level integration, ensuring they can optimize not just the PCB, but the entire enclosure and interconnects.
  • Verify their expertise in managing diverse Bill of Materials (BOM), particularly for custom enclosures, long-lead-time components, and specialized wire harnesses, beyond standard electronic parts.
  • Confirm relevant industry-specific certifications: ISO 13485 for medical devices, AS9100 for aerospace and defense, or ITAR registration if your product falls under US defense regulations.
  • Evaluate their in-house capabilities for cable harnessing, custom wire assemblies, and terminal crimping, demanding adherence to standards like IPC-A-620 for wire and cable harness quality.
  • Investigate their final functional testing (FFT) development process, including experience in designing and fabricating test fixtures, writing comprehensive test procedures, and providing robust test reports.
  • Beware of suppliers who show limited flexibility or enthusiasm for working with your existing preferred vendors for critical custom components (e.g., custom machined parts, specialized plastics), as this can indicate a lack of robust supply chain agility or potential vendor lock-in.
  • Examine their capacity for configuration management and revision control across all levels of the assembly, from individual components to the complete system, critical for ongoing product improvements and compliance.

Frequently Asked Questions

What documentation is absolutely critical for an accurate box build assembly quote, beyond just a Bill of Materials (BOM)?

Beyond your BOM, a complete box build quote requires detailed 3D CAD models (e.g., STEP, SolidWorks) for all custom mechanical parts (enclosures, brackets), comprehensive assembly instructions with torque specs and routing diagrams, a clear block diagram of the system, and a detailed specification for the final functional test (FFT) procedure, including expected pass/fail criteria and test equipment needed. Incomplete data is the leading cause of inaccurate quotes and project delays.

How do I ensure quality for the mechanical and aesthetic aspects of my box build, not just the electronics?

Focus on the supplier's first article inspection (FAI) process for mechanical components, their internal quality checks for fit-and-finish, paint adhesion, and label application. Inquire about their experience with specific materials (e.g., aluminum, plastics, composites) and finishing processes. Demand adherence to IPC-A-620 for cable and wire harness assemblies, which addresses critical mechanical integrity for interconnects. A strong partner will have dedicated mechanical QA processes separate from PCB-level inspection.

Should I provide my own specialized enclosures or let the box build assembler source them?

This depends on several factors. If you have an established relationship with a specialized enclosure manufacturer and proprietary tooling, providing your own may be more cost-effective. However, allowing the assembler to source can leverage their existing supply chain network, often leading to better pricing, integrated DFM feedback on the enclosure design, and consolidated quality control. Discuss the total cost of ownership, lead times, and quality control implications with potential suppliers during the quoting phase.

What's the difference between an EMS provider primarily focused on PCBA and a true box build specialist?

An EMS provider specializing in PCBA excels at surface mount technology (SMT) and thru-hole assembly for circuit boards. While they might perform basic sub-assemblies, a true box build specialist possesses deeper expertise in complex electro-mechanical integration. This includes advanced mechanical assembly, custom cable and wire harness fabrication, extensive experience with diverse enclosure types, and robust capabilities for full system-level testing, often involving custom test fixture development and sophisticated software loading.

What are the most common pitfalls in managing the Bill of Materials (BOM) for complex box builds?

Common pitfalls include outdated revision control across various sub-assemblies, neglecting End-of-Life (EOL) components for mechanical or custom parts, specifying single-sourced components without alternatives, and underestimating lead times for specialized items (e.g., custom machined parts, unique displays). A robust box build partner will perform thorough BOM scrubbing, identify potential issues early, and suggest qualified alternative components or suppliers to mitigate supply chain risks.

How critical is the final functional test (FFT) development for box build, and who typically owns it?

FFT is extremely critical, as it validates the entire product's functionality and performance before shipment, preventing costly field failures. While the buyer typically defines the test requirements and parameters, the box build assembler should be a collaborative partner in developing the test strategy, designing and fabricating test fixtures, writing test software, and executing the tests. A good partner will ask probing questions about test coverage, cycle time, and data logging requirements to ensure a robust and efficient FFT process.

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