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Last updated: January 2026
This directory lists 58 vacuum heat treating companies across the United States, from specialized job shops focusing on exotic alloys and R&D projects to high-volume commercial heat treaters handling common steel grades and larger production runs.
Buyers engage these suppliers to solve critical problems such as preventing decarburization and surface oxidation on precision components, achieving specific hardness profiles through processes like vacuum carburizing, and ensuring uniform material properties without introducing adverse microstructural changes. The ability to manage residual stresses and achieve precise dimensional control post-treatment is often paramount.
Supplier types in this sector generally fall into boutique specialists, who excel with complex geometries, tight tolerances, and exotic materials for industries like medical or defense, and larger commercial facilities, which offer greater capacity and often more standardized processes for industries like general industrial or automotive. The former often boast advanced metallurgical labs and highly specialized engineers, while the latter focus on efficiency and scalability.
To effectively engage these suppliers, buyers should come prepared with detailed material specifications, component drawings with critical dimensions, desired metallurgical properties (e.g., hardness range, case depth, core properties), and any post-treatment requirements. Suppliers, in turn, expect clear communication regarding end-use applications and acceptable limits for distortion minimization to ensure proper process selection and fixturing.
A significant trend in this category is the increasing demand for advanced processes like low-pressure vacuum carburizing for complex geometries, and improved high-pressure gas quench (HPGQ) systems for harder, denser materials. There's also a growing emphasis on process data transparency, digital traceability, and predictive maintenance for furnaces to ensure consistent quality and uptime.
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58 companies nationwide
Based in Grandview, TX, Advantage Aviation Technologies (AAT) is an FAA Repair Station serving the aviation industry for over 70 years. They provide comprehensive in-house services, including precision heat treating, CNC machining, welding, NDT, and composite repair. AAT specializes in innovative aircraft repair solutions and component overhauls for various aircraft.
Based in Moraine, Ohio, AccuPhase Metal Treating provides comprehensive heat treatment services, specializing in vacuum heat treating, carburizing, and nitriding. The company utilizes advanced processes to enhance the hardness, strength, and durability of various industrial metal components for diverse applications.
Based in South Gate, CA, Accurate Steel Treating provides a range of thermal processing services, including vacuum heat treating. The company specializes in aerospace heat treating, holding Nadcap accreditation. They are approved by major aerospace clients like Boeing and Northrop Grumman for critical material processing.
Aerocraft Heat Treating is an independent commercial heat treater specializing in steel, titanium, and high-temperature materials. They process forgings, castings, and machined parts, providing services for aircraft engine and structural components. The company offers a comprehensive range of heat treatment processes, holding Nadcap and AS9100/ISO9001:2015 certifications.
Analytic Stress Relieving, Inc. provides a full spectrum of comprehensive heat treating solutions, emphasizing quality and service. The company has been serving various industries since 1979, operating with a nationwide network and over 350 qualified technicians to meet diverse customer needs.
Based in Solon, OH, Braze Solutions LLC provides complete turn-key solutions for brazing, heat treating, and annealing. They specialize in advanced brazing, including all grades of titanium with ferrous and non-ferrous materials, for critical sectors such as aerospace, medical, and military, alongside related engineering services.
Burbank Steel Treating Inc, based in Burbank, CA, offers comprehensive metal heat treating and thermal processing services. They serve critical industries including Aerospace, Military, Automotive, Electronic, and Medical. The company provides precise, efficient solutions, leveraging extensive experience to meet exacting specifications and quality demands for various metal components.
Based in Santa Clara, CA, Byington Steel Treating Inc. offers expert heat treating services, including general, aluminum, and vacuum heat treatment. They specialize in precision heat treating, surface hardening, cryogenic, and metal forming services. Serving aerospace, electronics, automotive, and medical industries, the company operates with state-of-the-art equipment.
Based in Fairfield, OH, Byron Products specializes in vacuum and atmosphere heat treating services, complemented by extensive brazing and welding capabilities. With over 40 years of experience, they provide technical and tight-tolerance assembly operations for diverse industries. The company holds certifications including NADCAP, AS9100D, Rolls-Royce, Honeywell, Siemens, and GE.
Based in Cleveland, OH, Commercial Steel Treating specializes in providing professional heat treatment services for steel components. The company offers a variety of processes designed to enhance material properties, strength, and durability for commercial and industrial applications. They cater to businesses requiring precise control over metallurgical changes in their parts.
Based in Santa Fe Springs, CA, Continental Heat Treating, Inc. specializes in thermal processing, precisely altering the structural composition of metals for various alloys. They apply advanced knowledge and control of heating and cooling using top quality equipment. Serving aerospace, defense, energy, and transportation industries, they are NADCAP accredited.
Controlled Thermal Processing Inc. based in Torrance, CA, offers industrial thermal processing services. They remove manufacturing stresses, improve cutting properties of tool steels like HSS and Carbide, and enhance material characteristics such as tensile strength, toughness, and ductility for various components.
Based in Euclid, OH, Euclid Heat Treating has provided heat treating and secondary operations since 1946. Specializing in vacuum processing, induction hardening, case hardening, and quench & temper, the company serves medical, military, automotive, and tool & die industries. It holds AS9100 and ISO certifications.
Based in Santa Fe Springs, CA, Galaxy Brazing Inc. offers comprehensive vacuum furnace heat treating services. They specialize in various brazing techniques, including induction, torch, and furnace brazing, in addition to annealing, normalizing, and stress relieving. The company also performs induction hardening, soldering, and welding for diverse industrial applications.
Based in Montclair, CA, High Speed Steel Treating Co. INC operates a full-service heat treatment facility. With over 60 years of combined practical experience, the company provides quality heat treatment services, committed to meeting customer requirements and continually improving its business.
Based in Eastlake, OH, HI TecMetal Group Inc. specializes in heat treating, brazing, and welding services, providing thermal treatment since 1943. With five Northern Ohio locations, they serve aerospace, transportation, industrial, and manufacturing industries. Their HiTech Aero facility holds Nadcap and AS9100D accreditations.
Heat Treating Technologies Inc. is an industrial heat treating provider based in Lima, OH. The company leverages decades of experience, reliable lab services, and dedicated support staff to assist customers with their industrial heat treating projects.
Based in Elkhorn, WI, Hudapack Metal Treating, Inc. offers comprehensive commercial heat treating services. With multiple US plant locations, capabilities include vacuum processing, atmosphere hardening, carburizing, induction hardening, annealing, and nitriding. The company provides high-quality metal treating solutions, focusing on consistent results and timely order fulfillment for its clients.
Magnum Metal Treating Inc. based in Conroe, TX, specializes in comprehensive heat treating services, including vacuum heat treating. They provide precise thermal processing for critical components, minimizing distortion and oxidation. Serving aerospace, medical, tooling, and oil & gas industries, Magnum ensures enhanced material properties.
Based in Carol Stream, IL, Metals Technology Corporation provides comprehensive heat treating services to the Greater Chicago Metropolitan area. Specializing in vacuum heat treating up to 15 bar quench, gas nitriding, and bright annealing, the company offers tailored solutions. With a skilled metallurgical team, they ensure quality and quick turnaround.
Based in Huntington Beach, CA, Mil-Spec Heat Treating specializes in providing comprehensive heat treatment services. The company is equipped to handle various metallurgical processing needs, adhering to rigorous military specifications and industry standards for precision and quality.
Modern Heat Treat, based in Richland Hills, TX, offers direct vacuum heat treating services, hardening metals by removing oxygen from furnaces. Their 25,000 sq ft facility also provides alloy quench and temper, and carbonitride/carburizing processes for the Aerospace, Oil & Gas, and Construction industries.
Modern Industries, Inc. based in Erie, PA, provides vacuum heat treating services for oil quench tool steels, utilizing up to 10 multi-bar furnaces. The company also offers precision machining, hydraulic motion control, laboratory testing, and workholding solutions, serving industries such as automotive, aerospace, and medical.
Based in Houston, TX, National Heat Treat offers vacuum heat treating services like vacuum hardening and tempering. Utilizing state-of-the-art vacuum furnaces, they deliver superior results for industrial materials by minimizing distortion and surface contamination. Additional services include atmosphere heat treating and nitriding.
Phoenix Heat Treating, located in Phoenix, AZ, provides comprehensive heat treating services, including advanced vacuum processing, aluminum processing, and nitriding. The company specializes in resolving difficult heat treating problems that exceed typical capabilities, offering unique solutions and metal finishing for diverse industrial clients.
Precision Heat Treating Corporation, based in Fort Wayne, IN, specializes in a comprehensive range of thermal processing services. They offer vacuum heat treating, neutral hardening, carburizing, nitriding, tempering, annealing, and cryogenic processing for various steels and alloys. Serving industries like aerospace, automotive, medical, and defense, the company provides certified solutions.
Based in Valencia, CA, Metal Plasma Technology specializes in Ion Plasma Nitriding and Nitrocarburizing services. They provide case hardening for various steel alloys, serving aerospace, defense, power generation, oil & gas, automotive, and medical industries. The company is NADCAP accredited and approved by leaders like Boeing and GE Aviation.
Based in Youngstown, Ohio, P&L Heat Treating offers advanced heat treatment services. They leverage state-of-the-art equipment and expert technicians to deliver precision, consistency, and reliability. The company collaborates with clients to create durable, high-performing parts and smart solutions tailored to specific needs.
Rex Heat Treat is a commercial heat treating company operating two advanced facilities in Pennsylvania. Established in 1938, they provide a comprehensive range of services, including vacuum heat treating, austempering, and carburizing. The company serves diverse industrial sectors such as aerospace, defense, medical, and agriculture.
Based in Hampstead, MD, Ridge Engineering, LLC specializes in aluminum dip and vacuum brazing services, improving part structure, conductivity, and integrity. The company also offers advanced CNC machining, turning, milling, and precision laser cutting capabilities from its 84,674 square foot manufacturing facility, serving various industrial sectors.
Solar Atmospheres provides comprehensive vacuum heat treating and brazing services, operating over 90 furnaces across seven US locations. Serving aerospace, medical, and additive manufacturing sectors, they offer processes like annealing, stress relieving, and age hardening. The company handles large components, with vacuum furnace capacity up to 48 feet and 150,000 lbs.
Based in Round Rock, TX, Texas Heat Treating, Inc. provides professional heat treating services. The company emphasizes compliance with industry standards and customer requirements, holding certifications such as Nadcap, AS9100D, ISO 9001, and ISO 17025 accreditation. They serve the aerospace and general heat treating industries.
Based in Hayward, CA, ThermoFusion Inc. is an ISO 9001:2015, AS9100D, and Nadcap certified provider of metallurgical heat treating services. They specialize in a comprehensive range of processes, including annealing, brazing, carburizing, nitriding, and stress relieving, ensuring high-quality thermal processing for diverse industrial applications.
Based in Waukesha, WI, ThermTech is a privately held commercial heat treating company. They provide a comprehensive range of heat treating services to a diverse clientele. Their offerings likely include various specialized processes, catering to the exacting demands of industrial customers.
Vacu Braze, Inc. based in Quakertown, PA, specializes in precision vacuum heat treating and brazing services. They provide comprehensive thermal processing, cryogenic treatment, and metallurgical consulting. Serving medical, defense, aerospace, nuclear, and additive manufacturing industries, the company supports North American manufacturers.
Based in Garden Grove, CA, Varco Heat Treating Company has provided reliable metal heat treating services since 1908. Offering high-quality solutions, the company is NADCAP, ISO 9001:2015, and AS9100D accredited, ensuring excellence in its heat treatment processes.
Based in Waukesha, WI, Waukesha Foundry specializes in precision vacuum furnace services and advanced heat treatment. The company offers comprehensive capabilities for processing high-quality castings, focusing on enhancing metallurgical properties and product performance for diverse industrial applications.
Based in Dayton, OH, Winston Heat Treating Inc. has specialized in vacuum heat treating since 1967. They provide quality heat treatment services to industries like aerospace, automotive, medical, and mold-making. Winston holds both NADCAP and ISO accreditations, ensuring high standards and dependable service.
Bodycote Heat Treatment is the world's largest service provider of heat treatment and specialist metallurgical technologies. With numerous facilities across the United States, the company offers a comprehensive range of thermal processing solutions, including vacuum heat treatment, carburizing, nitriding, and brazing for diverse industrial applications.
Based in Santa Fe Springs, CA, HTA Los Angeles provides advanced thermal processing solutions, including vacuum brazing, Cryotemp® processing, and precipitation hardening. The company also offers ASTM E18 laboratory testing services, leveraging over 50 years of combined expertise.
Wall Colmonoy, based in Madison Heights, MI, offers high-temperature vacuum brazing and heat treatment services through its US Brazing Engineering Center. The company also specializes in advanced surfacing and brazing alloys, engineered components, and additive manufacturing for aerospace, energy, and transportation industries.
Aalberts Surface Technologies specializes in high-quality metal treatments, enhancing strength, durability, and precision for diverse industrial projects. This company provides advanced solutions to improve material performance and meet demanding specifications for various applications.
Applied Thermal Technologies Inc. provides commercial vacuum heat treating and brazing services for stainless steel and exotic alloys. Since 1992, they have served industrial sectors including medical, aerospace, military, and food handling. The company holds Nadcap™ accreditation and offers validation engineering to support customer-specific processes.
Based in La Porte, TX, HTS AmeriTek provides expert on-site and off-site metal heat treating services. The company specializes in precision metal, stainless steel, and aluminum heat treatment for refinery, petrochemical, fabrication, and pipeline industries, enhancing component durability and performance.
Based in Pontiac, MI, HTS Heat Treating Services provides comprehensive heat treating solutions for large-volume manufacturers and machiners of rough castings and forgings. They specialize in fulfilling diverse heat treating needs for industrial clients.
Based in Detroit, MI, Hy-Vac Technologies, Inc. specializes in vacuum and controlled atmosphere heat treating, offering processes like annealing, brazing, and sintering. They also provide aluminum heat treating and furnace brazing services. The company serves industrial clients in the aerospace, military/defense, automotive/heavy truck, and medical industries.
Based in St. Louis, MO, Paulo is a commercial thermal processing company providing precise, repeatable services for mission-critical parts. As thermal processing experts, they serve manufacturers in aerospace, automotive, and other industries with a wide variety of processing needs, likely including vacuum heat treating.
Based in Clintonville, WI, Precision Thermal Processing provides high-quality thermal process services for metals. Capabilities include hardening, normalizing, stress relieving, annealing, induction processing, surface treatments, and vacuum processing. The company also offers metallurgical analysis and serves industries like transportation and power generation.
Q Tech Heat Treat Inc. based in Dallas, TX, provides comprehensive vacuum heat treating services. Specializing in processes like vacuum tempering, annealing, and brazing, the company serves diverse industries including aerospace, medical, tool & die, and oil & gas, utilizing advanced vacuum furnace technology.
Based in Orange, CA, Scarrott Metallurgical Company provides high vacuum heat treating and brazing services. The facility specializes in processing aerospace and medical grade materials, ensuring pristine and clean atmospheres for thermal processes. They offer essential services for final production requirements in critical industries.
Based in Cranston, RI, Spectrum Thermal Processing is a Nadcap accredited heat treating company. They specialize in vacuum processing for superior surface finishes, low-pressure vacuum carburizing, and vacuum integral oil quenching. Their comprehensive services also include deep freeze, brazing, hardening, annealing, and gas nitriding, serving automotive, aerospace, and electronics sectors.
Based in Farmington Hills, MI, SST is an ISO certified metal and steel heat treatment company with over 60 years of experience. They specialize in precision-controlled heat treating services, including vacuum heat treatments, case hardening, and tempering steel. SST serves industrial sectors like aerospace, rail, and automotive.
Based in South El Monte, CA, Supreme Steel Treating Inc. provides comprehensive vacuum heat treating services for tool steels, high-speed steels, and alloys. Their capabilities include hardening, bright annealing, solution, precipitation hardening, stress relieving, and tempering, all performed in vacuum. They also offer induction hardening, carburizing, and cryogenic treatment.
Based in Orange, CA, Thermal-Vac Technology, Inc. provides vacuum heat treating, brazing, and coating services. Specializing in aerospace and defense applications, the company handles extreme environments and exacting tolerances. They are NADCAP approved for heat treating and brazing, also offering quick-turn production and R&D support.
Based in Sacramento, CA, Vacuum Process Engineering, Inc. (VPE) provides science-based metallurgical services, including precision heat treating, brazing, diffusion bonding, and hot pressing. The company specializes in mission-critical assemblies for high-tech industries such as aerospace, medical, and semiconductor.
Based in Elk Grove Village, IL, BTX Precision specializes in flux-free aluminum vacuum brazing for high-performance, leak-tight assemblies. As a platform of high-performance manufacturing organizations, they deliver build-to-print solutions. BTX serves mission-critical needs across aerospace, defense, and thermal applications.
Coating Services Group, based in Lakeside, CA, is a full-service metal finishing company offering diverse surface treatments. They provide specialized heat treating services, including vacuum heat treating, hydrogen annealing, and age hardening. Their solutions are designed to enhance the strength, durability, and performance of various metals and alloys.
Based in Cleveland, OH, General Metal Heat Treating provides comprehensive metal heat treating services for various industrial applications. Specializing in processes that enhance material properties, the company serves diverse manufacturing sectors. They utilize their own facilities and expertise to deliver reliable thermal processing solutions for metal components.
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Partial pressure control is vital for preventing surface reactions like decarburization or oxidation by precisely managing residual gases within the vacuum chamber. It also influences the effectiveness of high-pressure gas quench (HPGQ) by allowing for controlled backfilling, which is critical for achieving optimal cooling rates and minimizing distortion in various alloys.
AMS 2750F is a pyrometry standard that dictates furnace temperature uniformity surveys, thermocouple calibration, and instrumentation. Compliance ensures that your parts are consistently exposed to the specified temperature profile throughout the vacuum cycle, directly influencing the accuracy of metallurgical transformations, preventing overheating or under-treating, and maintaining process repeatability.
You absolutely should consider a Nadcap-accredited supplier if your components are destined for aerospace, defense, or other highly regulated industries where process control, traceability, and consistent quality are paramount. Nadcap certification for heat treating specifically validates a supplier's robust control over critical process variables, going far beyond general ISO 9001 requirements.
Distortion often arises from uneven heating or cooling rates, part geometry, fixturing, and material stress relief. A good supplier mitigates distortion through precise furnace loading, optimized high-pressure gas quench (HPGQ) parameters (including quench gas selection and pressure), specialized fixturing designed for your part, and potentially multi-step tempering or stress-relief cycles tailored to the material and part design.
Provide detailed material specifications (e.g., alloy designation, previous thermal history), complete part drawings with critical dimensions and tolerances, the desired final hardness range or microstructure, required case depth for processes like vacuum carburizing, specific industry standards or specifications to be met (e.g., AMS 2750F, Nadcap), and any post-treatment cleaning or inspection requirements.
Vacuum carburizing, also known as low-pressure carburizing (LPC), is a thermochemical process performed in a vacuum furnace where carbon-rich gas is introduced at low pressure to diffuse carbon into the surface of steel parts. Its key benefits include superior case depth uniformity on complex geometries, reduced distortion, cleaner part surfaces (no intergranular oxidation), and shorter cycle times for specific applications compared to traditional atmospheric gas carburizing.