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Last updated: January 2026
This directory lists 61 centerless grinding companies across the United States, from high-volume dedicated lines serving automotive and appliance sectors to specialty precision shops focused on medical, aerospace, and defense applications.
Buyers engage centerless grinding companies to address a spectrum of critical manufacturing problems. This includes achieving exceptionally tight geometric tolerances for components requiring superior roundness, concentricity, and cylindricity, often necessary for rotating shafts, pins, and bushings. They also solve challenges related to consistent surface finish (Ra, Rz) and precise diameter reduction, especially when correcting deformation from heat treatment or preparing parts for subsequent processes like plating.
Supplier types in this space broadly fall into a few categories: large-scale production houses equipped for long-run through-feed grinding of bar stock or simple cylindrical parts; specialized job shops adept at complex in-feed grinding for stepped, tapered, or shoulder components; and precision micro-grinding outfits focused on extremely small diameters and sub-micron finishes for sensitive applications. Distinctions often hinge on their primary equipment, capacity, material expertise, and inspection capabilities.
To effectively engage these suppliers, buyers should arrive with comprehensive engineering drawings detailing all critical dimensions, geometric tolerances, and explicit surface finish callouts (e.g., Ra, Rz, or Rmax). Crucially, provide material specifications, hardness requirements, and the pre-grind condition of the part, including any prior heat treatment. Suppliers will expect to understand the application, expected annual volume, and any specific fixturing or inspection needs.
A notable trend in the centerless grinding sector is the increasing demand for ultra-precision on difficult-to-machine materials, pushing suppliers to invest in advanced grinding wheel technology (e.g., CBN, ceramic abrasives), sophisticated coolant management systems, and integrated in-process gauging. Automation, including robotic loading/unloading and lights-out operation, is also becoming more prevalent to drive efficiency and consistency in high-volume environments.
61 companies nationwide
Based in Corona, CA, Accurate Grinding & Manufacturing Corporation specializes in AS9100D certified aerospace machining and grinding. They process cylindrical parts up to 30 inches long and 6 inches in diameter, achieving tight tolerances. Working with various alloys, they serve aerospace clients like Honeywell and Moog.
Based in San Jose, CA, ACM Grinding is a family-owned company specializing in centerless grinding services. As 3rd generation centerless grinders, they provide direct interaction with owners from project inception to completion, aiming to deliver top-quality results to their customers.
Based in Riverside, CA, Acro-Spec Grinding Co Inc offers precision grinding services for various materials, including titanium, stainless steels, brass, aluminum, and plastics. With over 57 years of experience, they manufacture high-quality products and provide knurling for cylindrical parts for industrial customers.
Based in Latrobe, PA, Aggressive Grinding Service offers precision carbide grinding and advanced ceramic finishing from its 42,000 sq/ft facility. Services include centerless, OD, ID, peel, and surface grinding, ID honing, PCD grinding, and Wire EDM. They deliver quality with quick turnaround for industrial clients.
Based in Orange, CA, All Diameter Grinding Inc. provides precision grinding services from its 20,000 sq ft facility. Specializing in centerless, OD, ID, and surface grinding, the company also offers honing, lapping, and polishing. They serve diverse industrial customers with comprehensive grinding solutions.
Based in Santa Fe Springs, CA, Alpa Centerless Products Inc. specializes in precision centerless grinding services. The company provides grinding solutions for a range of industrial applications and components, utilizing its expertise in advanced machining processes.
B J Grinding Inc. is a Burbank, CA-based company specializing in precision grinding services. Operating from its dedicated facility, the company offers various grinding capabilities for industrial and commercial clients, which are expected to include centerless grinding solutions. They provide specialized manufacturing services to meet client specifications.
Based in Houston, TX, Cassco Grinding & Machining delivers quality manufacturing and machining services. The company prioritizes innovation, employing degreed engineers to develop solutions. With 24/7 availability and real-time progress updates, Cassco is dedicated to superior customer service and timely project completion for industrial clients.
Centerless Tech specializes in precision grinding services, offering thrufeed, bar, journal, and infeed grinding. The company also provides cylindrical grinding, bar straightening, burnishing, polishing, and honing. Committed to high workmanship and timely delivery, Centerless Tech ensures products meet customer standards at competitive prices.
Based in Dallas, TX, Commerce Grinding Company has provided high-quality grinding solutions across North America since 1976. They specialize in precision Blanchard, surface, ID/OD, and centerless long bar grinding to tight tolerances. The company also offers a full-service machine shop with waterjet, gun drilling, and honing capabilities.
Based in Downey, CA, Downey Grinding Co Inc specializes in centerless grinding services, including infeed and thru-feed grinding, for outside diameters from .030” to 2.500”. Serving the aerospace industry since 1960, they maintain tight tolerances and provide superior finishes. The company adheres to MIL-I-45208A and stringent military standards.
Based in Santa Ana, CA, Duval Precision Grinding is a family-owned and operated company established in 1980. With over 40 years of experience, the company provides exceptional precision grinding services. They are committed to delivering precise products and quality services for their customers' business needs.
Based in Santa Fe Springs, CA, Electronic Chrome & Grinding Co., Inc. provides precision hard chrome plating and comprehensive grinding services, including ID-OD and centerless grinding. With over 70 years of expertise, they refurbish parts for enhanced wear protection in performance racing, hydraulics, and oil/gas drilling.
Based in West Haven, CT, ERA Wire Inc. provides on-site through-feed centerless grinding services. They specialize in processing cylindrical parts like rods and shafts, made from ferrous and non-ferrous materials. This complements their wire straightening and cutting, serving industrial clients with precision wire finishing.
Based in El Paso, TX, Filvar Manufacturing Inc. specializes in machining services, including centerless grinding, tool and die, cold forming, and laser cutting. They manufacture precision parts for the medical, electronic, pneumatic, and electrical industries, utilizing a 10,000 sq ft facility to process materials like stainless steel, aluminum, brass, and engineering plastics.
General Grinding & Manufacturing Co. LLC, based in La Mirada, CA, specializes in centerless grinding of steel, titanium, and specialty alloys, maintaining tight tolerances. They also offer OD/ID grinding and CNC machining. Serving aerospace, defense, and commercial industries, the company is AS9100 and ISO 9001 certified.
Based in Huntington Beach, CA, Great Western Grinding, Inc. provides professional grinding services for industrial clients. The company offers precision machining capabilities to meet various manufacturing specifications, serving as a direct provider of specialized grinding operations.
Based in Itasca, IL, Grindal Company is an ISO 9001:2015 certified precision grinding specialist since 1965. They offer extensive services, including centerless, OD, ID, surface, and vertical grinding. Capabilities handle parts up to 18” diameter and 60 inches long, alongside ID honing and machine repair.
Grinding Technology LLC provides high-precision centerless grinding services from its Houston, TX facility. Specializing in barstock, tubing, and shafts, they can grind diameters from .010” to 6.000” and lengths up to 20 feet. The company also offers rotary, thrufeed, and infeed grinding capabilities.
H&M Plating Co., Inc. in Houston, TX, offers industrial reconditioning services, including electroplated chrome, thermal spray coatings, and cylindrical grinding & honing. Serving oil & gas, petrochemical, and manufacturing sectors, the ISO 9001 certified company operates 24/7, providing efficient turnaround for critical equipment refurbishment.
Based in Houston, TX, Houston Centerless Grinding Service, LLC provides precision centerless grinding, shaft straightening, and CNC shaft turning services. They produce excellent roundness, low surface finishes, and hold tight tolerances for a wide range of industries, handling projects from prototypes to large-scale production.
Hi-Precision Grinding & Manufacturing offers precision centerless grinding and machining services, achieving tolerances as close as 10 millionths. They specialize in OD grinding, lapping, and accurate thread grinding for aerospace, defense, scientific, and medical device industries, processing steel, aluminum, and exotic materials. The company maintains ISO 9001 / AS 9100D certifications.
Based in Santa Fe Springs, CA, LongBar Grinding, Inc. specializes in centerless grinding, a primary focus since 1967. This ISO 9001:2015 and AS9100D certified company offers reliable, quality solutions for both short and long production runs. They emphasize fast turnaround for diverse industrial needs.
Based in St. Louis, MO, McCay Tool and Engineering is a manufacturer of precision aerospace components. They provide cylindrical grinding, CNC milling, turning, and 5-axis machining services. With over seven decades of experience, they serve major aerospace and government entities.
Based in Minneapolis, MN, Minnesota Grinding, Inc. specializes in high-quality production grinding services. They offer centerless, OD, ID, surface, and Blanchard grinding capabilities. Utilizing advanced CNC equipment, they deliver precision grinding solutions for industrial components, ensuring tight tolerances and superior finishes.
Based in Bessemer, AL, Precision Grinding, Inc. was established in 1971. The company specializes in custom steel processing, providing services such as plate cutting, industrial grinding, CNC machining, and custom fabrication. They cater to industrial and commercial clients seeking comprehensive metalworking solutions.
Pro-Grind Inc. is a family-owned and operated centerless grinding facility based in Houston, TX, with over 45 years of experience. They specialize in thru-feed, in-feed, bar, and form grinding for various materials including stainless steel, carbon steel, alloys, and plastics, serving diverse industrial applications.
Raymac Grinding is a precision grinding company specializing in a comprehensive range of services. They offer centerless grinding, honing, OD grinding, ID grinding, and surface grinding. Based in the US, the company provides expert solutions for various industrial applications, ensuring high-quality results.
Based in New Haven, MI, Sturdy Grinding Company offers high-volume centerless grinding services, including end feed plunge and thru-feed. They provide precision bar stock and CNC OD grinding for complex parts requiring exceptionally tight tolerances, specializing in the automotive sector.
Based in Santa Clara, CA, Swiss Screw Products Inc. provides precision manufactured metal and plastic parts to Silicon Valley's Hi-Tech industries since 1969. Specializing in CNC machining, screw machining, milling, and turning, the company offers a comprehensive range of secondary operations, including centerless, surface, and ID/OD grinding services.
Based in Brownstown, MI, Systrand provides high-precision machining and gear manufacturing services. The company utilizes CNC cylindrical grinding machines for high-volume production, excelling at tight tolerances and low NVH levels. Systrand is a Tier 1 supplier, certified ISO/IATF 16949.
Based in East Hartford, CT, United Centerless Grinding & Thread Rolling provides custom centerless grinding, thread rolling, wire EDM, Swiss precision machining, and CNC profile grinding services. As an AS9100D and ISO 9001:2015 registered company, they serve aerospace, automotive, medical, military, and commercial industries.
Based in Appleton, Wisconsin, Valley Tool specializes in providing cylindrical grinding services for precision components. The company also offers custom tool manufacturing, reconditioning of cutting tools to 'like new' performance, and comprehensive tool management solutions, focusing on quality and efficiency for its clients.
Based in Milpitas, CA, Yuhas Tooling & Machining, Inc. provides precision machining services for leading technology industries. Core capabilities include CNC milling, CNC turning, grinding, lapping, broaching, assembly, plating, and heat treating. The company is equipped to handle large format projects.
Based in Troy, MI, Dynamic Precision Tool & Manufacturing specializes in precision CNC machining, grinding, and wire EDM services. They offer Inside Diameter (ID) and Outside Diameter (OD) grinding, achieving tight tolerances for critical parts. The company serves demanding sectors like aerospace, military, medical, and automotive.
Based in Mason, OH, Ashley Ward is a precision manufacturer offering a comprehensive range of machining services for industrial clients. They specialize in centerless grinding, CNC turning, gear hobbing, spline rolling, and various screw machining processes, along with induction heat treating.
Based in Houston, TX, B-W Grinding Service Inc. offers full-service manufacturing, coating, and precision grinding. The company specializes in OEM replacement parts and components for gas and steam turbines, compressors, and pumps, serving turbomachinery, oil and gas, and industrial gas turbine markets.
Based in Oxford, CT, CED Services provides precision CNC manufacturing solutions. They offer multi-axis CNC machining, turning, milling, cutting, welding, and high-precision finishing, including grinding CNC machined parts. The company supports complex part and component manufacturing through consulting, engineering, and development expertise.
Based in Tucker, GA, Centerless Grinding Service specializes in centerless ground and polished products. Operating since 1972, they process various materials including carbon, alloy, and stainless steels, brass, aluminum, and exotic metals. The company serves industrial clients across automotive, marine, medical, and pulp and paper industries for diverse production needs.
Based in Schiller Park, IL, E.J. Basler Co. is a high-volume precision machine shop. They specialize in CNC grinding services for cylindrical parts requiring precision diameters and offer comprehensive CNC machining. Capabilities include Hydromat, Davenport, multi-spindle, and Swiss screw machining for custom precision components.
Based in Hatboro, PA, KMM Group is a precision contract manufacturer specializing in complex, tight-tolerance components. They offer ultra-precision and hybrid CNC centerless grinding, medical guidewire grinding, and multi-axis CNC OD/ID grinding. KMM serves industries like MedTech, aerospace, defense, and robotics.
Mahuta Tool Corp., based in Germantown, WI, specializes in expert OD grinding services for cylindrical components. Serving aerospace, automotive, and medical industries, they offer comprehensive CNC machining, turning, and milling. The ISO 9001:2015 certified company provides a wide range of secondary services for custom tool manufacturing.
Based in Cincinnati, OH, Midwest Precision Grinding Co. specializes in high-quality, precision cylindrical and centerless grinding services. They offer capabilities including centerless in-feed, thru-feed, and bar grinding, alongside cylindrical OD and internal grinding, working with materials such as tool steel and carbon fiber.
Based in Freeport, NY, Ondrives.US provides precision centerless grinding services, combining advanced technology with expert craftsmanship. They also offer extensive custom capabilities including gear cutting, precision turning, and milling. As a manufacturer, Ondrives.US produces high-quality shaft couplings and P-Series gearboxes, serving various industrial applications.
Based in Gardena, CA, Pacific Precision Grinding specializes in cylindrical I.D. and O.D. grinding, prominently offering centerless grinding capabilities. With over 35 years of experience, they provide precision grinding for ferrous and non-ferrous metals, supporting Aerospace, Petroleum, Military, and Automotive industries.
Based in Redwood City, CA, Petersen Precision is an ISO 9001/AS9100 certified high-volume manufacturer of precision metal parts. They offer centerless, double disc, fine, creep feed form, and surface grinding for complex profiles. Additional capabilities include CNC machining, fine blanking, lapping, and Wire EDM.
Based in Hamden, CT, Precision Grinding Solutions, LLC provides innovative grinding and inspection solutions for state-of-the-art applications. They serve industrial markets including aerospace/defense, automotive, and mold making. The company maintains AS9100D and ISO9001:2015 certifications, ensuring quality management and customer satisfaction.
Sauceda's Precision Grinding, Inc., established 1979 in San Benito, TX, provides precision grinding and CNC production services for mass manufacturing. The company also designs and builds custom specialty process equipment, jigs, fixtures, and gages, serving industrial clients with quality fabrication and custom solutions.
Based in Oxford, MA, Swissturn USA is an employee-owned CNC Swiss manufacturer offering expert centerless grinding services with over 40 years of experience. They provide precision CNC grinding for bar stock preparation and finished components, serving industries such as aerospace, medical, firearms, and defense.
Based in Santa Clara, CA, Western Grinding Service Inc. is an ISO 9001:2015 Certified manufacturer. They specialize in high precision, tight tolerance parts, offering direct centerless and cylindrical grinding. Capabilities extend to CNC Swiss turning, surface grinding, milling, and internal grinding, serving medical, automotive, aerospace, and defense industries.
Based in Santa Clarita, CA, Advanced CNC Grinding specializes in precision grinding services. They offer comprehensive capabilities including CNC grinding, OD, ID, surface, centerless, and double disc grinding, alongside honing. The company serves industrial clients requiring high-tolerance finished parts and components.
Based in Riverside, CA, Anderson Form Grinding provides precision grinding services, specializing in centerless, form, ID/OD, and surface grinding. They offer comprehensive capabilities including honing, lapping, polishing, milling, turning, and heat treating for various industrial applications.
Apex Grinding, Inc. provides state-of-the-art precision grinding services for industrial components and bars. They specialize in delivering high-quality, in-spec parts on time, supporting manufacturing needs with advanced grinding solutions.
Arrow Grinding, a family-owned company established in 1956, specializes in precision grinding services. They offer close-tolerance part manufacturing, adhering to AS 9100 and ISO 9001 quality standards. This provider focuses on delivering high-quality grinding solutions for industrial applications.
Boston Centerless specializes in the manufacturing and distribution of precision bar materials, providing advanced centerless grinding services. The company is recognized for its ability to achieve components with extremely tight precision tolerances, serving a range of industrial and commercial B2B customers.
Based in Elk Grove Village, IL, BTX Precision offers advanced precision manufacturing services, including grinding, lapping, milling, turning, and EDM. They provide build-to-print solutions for mission-critical needs across demanding industries like aerospace, defense, medical, and semiconductor.
Crush Master Grinding Corporation, based in Walnut, CA, specializes in precision centerless grinding services. They offer through-feed, in-feed, and bar grinding for various materials and industries, utilizing modern equipment and experienced personnel to deliver high-quality, precise grinding solutions.
Based in Denton, TX, Mayday Manufacturing specializes in precision CNC machining and comprehensive grinding services. They offer centerless, OD/ID, and surface grinding, alongside CNC milling, turning, and Wire EDM. The company produces high-quality components for aerospace, defense, medical, automotive, and energy industries.
Based in Buena Park, CA, Quality Grinding Co., Inc. specializes in precision centerless grinding services. They offer comprehensive thru-feed, in-feed, and bar grinding capabilities for diverse materials, ensuring high-quality surface finishes and tight tolerances for various industrial applications. The company has been serving the precision grinding industry since 1957.
West Coast Centerless Grinding, located in Santa Fe Springs, CA, offers high-volume precision centerless grinding services. Specializing in through-feed, in-feed, bar, and CNC grinding, they process diverse materials including metals, plastics, and ceramics. The company is dedicated to achieving tight tolerances for industrial applications.
Based in Sussex, WI, Wisconsin Metal Tech is a precision metal fabrication and machining company. They directly provide comprehensive grinding services, including both thru-feed and in-feed centerless grinding. Serving diverse industrial clients, the company offers custom solutions for various metal components and assemblies.
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Achieving consistent roundness and concentricity requires a combination of factors. First, ensure the supplier uses high-quality, well-maintained machines with rigid spindle designs. Crucially, ask about their work rest blade and regulating wheel setup: the material, angle, and condition of the work rest blade significantly impact stability, while the regulating wheel's trueing, dressing, and speed control are vital for consistent feed and roundness. Experienced suppliers will also employ in-process gauging or post-process inspection with specialized roundness checkers and CMMs to verify these critical geometric tolerances.
Through-feed grinding is ideal for high-volume production of continuous cylindrical parts without interruptions, such as long rods, tubes, or pins, where the part passes continuously between the grinding and regulating wheels. It's generally more cost-effective for these applications due to continuous processing and minimal loading/unloading. In-feed grinding, conversely, is used for parts with shoulders, tapers, or complex profiles that require the part to be loaded, ground, and then ejected. While offering greater versatility for complex geometries, it typically involves higher cycle times and thus higher costs per part due to the intermittent loading/unloading process and more complex setup.
For surface finish, expect profilometer reports showing Ra (average roughness), Rz (average maximum peak-to-valley height), or Rmax (maximum peak-to-valley height) as specified on your print. For dimensional accuracy, suppliers should provide CMM reports, optical comparator data, or micrometer/caliper readings on critical diameters. For high-volume production, inquire about their Statistical Process Control (SPC) charts, which demonstrate process stability and adherence to tolerance bands over time, including CPK and PPK values.
Long, slender parts are prone to deflection and vibration, leading to issues like taper, lobing, or chatter marks. Experienced suppliers mitigate this through precise work rest blade selection (e.g., carbide-tipped for rigidity), careful setup of bar support systems along the grinding zone, optimized regulating wheel speeds, and precise grinding wheel dressing. Exotic alloys often present challenges like heat sensitivity, rapid tool wear, or galling. Mitigation includes using specialized CBN or diamond grinding wheels, high-pressure through-the-wheel coolant systems, reduced stock removal rates, and highly controlled feed rates to prevent thermal damage and ensure surface integrity.
The regulating wheel controls the axial feed rate of the workpiece, its rotational speed, and precisely positions the workpiece against the grinding wheel. Its angle, speed, and condition are critical for consistent stock removal, feed rate, and especially the final roundness and concentricity. The work rest blade supports the workpiece during grinding. Its material (e.g., carbide, cast iron, bronze), angle, and height are paramount for workpiece stability, preventing vibration, and dictating the point of contact between the workpiece, grinding wheel, and regulating wheel. An optimal setup minimizes deflection and ensures the part is presented consistently to the grinding wheel, directly impacting surface finish, dimensional accuracy, and efficiency.