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Last updated: January 2026
This directory lists 55 induction hardening companies across the United States, from specialized job shops focusing on specific geometries to vertically integrated manufacturers offering a broad spectrum of heat treatment services.
Buyers often engage induction hardening suppliers to achieve localized surface hardening, significantly improving wear resistance and fatigue strength without affecting the core properties of the material. This process is critical for components like gears, shafts, bearings, and axles, where a tough core is needed to withstand shock loads, but a hard surface is essential for longevity. Key challenges revolve around achieving precise case depth, managing residual compressive stress, and ensuring dimensional stability.
Supplier types in this sector vary widely: some are dedicated induction hardening specialists, often excelling in specific part types or volumes. Others are full-service heat treaters, offering induction hardening alongside processes like carburizing, nitriding, or through-hardening. Distinguishing factors include their array of coil designs, frequency capabilities (e.g., low, medium, high, dual frequency), and ability to handle parts ranging from small pins to large heavy-duty shafts, as well as their in-house metallurgical testing capabilities.
To ensure a smooth engagement, buyers should arrive prepared with detailed part drawings, material specifications (including pre-heat treatment condition), critical dimensions, and specific metallurgical requirements like effective hardened depth (EDH), surface hardness range, and desired microstructure. Suppliers, in turn, expect clarity on volume projections, acceptable distortion limits, and any post-hardening processing or testing requirements.
A significant trend in the induction hardening industry is the increasing demand for advanced process control and simulation tools. This allows for more precise temperature profiles and quench parameter management, directly addressing tighter dimensional tolerances and more complex part geometries, ultimately reducing the trial-and-error often associated with new part qualification.
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55 companies nationwide
Based in Grandview, TX, Advantage Aviation Technologies (AAT) provides innovative repair and overhaul solutions for fixed-wing aircraft and helicopters. An FAA Repair Station, they offer comprehensive in-house services, including CNC machining, precision welding, composite repair, and crucial heat treatment for aviation components.
American Steel Treating provides comprehensive steel treating services, specializing in neutral hardening processes for various steel parts. Based in Perrysburg, OH, the company delivers high-quality and consistent heat treatment results. They focus on ensuring precise outcomes tailored to specific material requirements for industrial and commercial clients.
Burbank Steel Treating Inc specializes in metal heat treating and thermal processing services. Located in Southern California, they serve the Aerospace, Military, Automotive, Electronic, and Medical industries. The company leverages extensive experience to provide world-class thermal processing solutions, ensuring product quality and meeting customer specifications for various hardening requirements.
Based in Santa Clara, CA, Byington Steel Treating provides expert heat treating and surface hardening services. Specialties include induction hardening, carburizing, carbonitriding, and nitriding, alongside cryogenic treatments and metal forming. They serve the aerospace, electronics, automotive, and medical industries.
Based in East Chicago, IN, Chicago Flame Hardening is a family-owned company offering specialized metal heat treating services. They provide flame hardening and related surface hardening solutions for various industrial applications. The company holds a unique position within the metal-treating industry, focusing on material enhancement processes.
Based in Indianapolis, IN, Contour Hardening offers induction hardening and gas nitride thermal processing. For over 35 years, the company has provided science-based, repeatable solutions delivering precise hardness, depth, and minimal part distortion. They serve aerospace, automotive, agriculture, heavy machinery, and firearms industries.
Based in Maywood, CA, Cook Induction Heating Co. Inc. specializes in induction heating and metal joining. They provide heat treating services like localized hardening, localized annealing, and induction case hardening. The company holds Nadcap Merit status for heat treating and brazing, confirming their commitment to quality for the aerospace industry.
Based in Euclid, OH, Euclid Heat Treating specializes in induction hardening services for surface hardening steel. Established in 1946, they offer comprehensive heat treating capabilities, including case hardening and vacuum processing. The company serves diverse industries such as automotive, medical, military, and tool & die.
Based in Santa Fe Springs, CA, Galaxy Brazing Inc. offers specialized metal treatment services. They provide various brazing techniques, including induction, torch, and furnace. The company performs comprehensive heat treating, notably induction hardening, annealing, normalizing, and stress relieving, plus soldering and welding.
Horsburgh & Scott provides custom gear heat treatment services, including in-house induction hardening, gas carburizing, stress-relieving, and through-hardening. They also offer custom engineering and precision manufacturing of new and replacement gears and gearboxes, along with 24/7 emergency repair services.
Based in Montclair, CA, High Speed Steel Treating Co. INC (HSST) operates as a full-service heat treatment facility. Leveraging over 60 years of combined experience, HSST is committed to delivering quality heat treatment services. The company strives to meet customer requirements and incorporates technological advancements to enhance service delivery.
Based in Elkhorn, WI, Hudapack Metal Treating, Inc. is a three-plant commercial heat treating provider established in 1985. The company specializes in high-quality solutions, including induction hardening, atmosphere hardening, carburizing, annealing, nitriding, and vacuum processing for various industrial applications.
JASCO Heat Treating, based in Philadelphia, PA, is a family-owned provider of commercial and industrial metallurgical services. They specialize in a range of heat treatment processes, including induction hardening, atmosphere carburizing, gas nitriding, and vacuum heat treating. The company also offers abrasive blasting and metallurgical testing services.
Based in Houston, TX, Lone Star Heat Treating Corp directly provides induction hardening services for specific part areas. They also offer batch and vertical heat treating, controlled atmosphere case hardening, and comprehensive testing. Certified to AS 9100 and ISO/IEC 17025, the company has delivered quality heat treating solutions since 1945.
Magnum Induction, based in New Baltimore, MI, specializes in induction heat treating for large and unique part configurations. They accommodate extreme diameters and lengths for components such as rolls, shafts, and gears. With over 40 years of experience, the company provides innovative process solutions utilizing state-of-the-art technology for diverse induction hardening requirements.
Based in Conroe, TX, Magnum Metal Treating Inc. specializes in a comprehensive range of heat treating services for industrial clients. Their core offerings include atmosphere and vacuum heat treating, nitriding, stress relieving, cryogenic treating, and induction hardening. The company provides specialized processes to enhance material properties for various demanding applications.
Martin's Metal Services, LLC, based in Springfield, OH, provides direct induction hardening and comprehensive metal heat treatment. Their services include cryogenic treatment, nitriding, tempering, and annealing, alongside shot peening, black oxide, and metallurgical lab capabilities for diverse industrial applications.
Based in Carol Stream, IL, Metals Technology Corporation provides comprehensive heat treating services to the Greater Chicago Metropolitan area. They specialize in induction heat treating for gears, along with vacuum heat treating, gas nitriding, automated neutral hardening, and bright annealing. The company has served customers for over 59 years.
Based in Erie, PA, Modern Industries is a diversified services company providing thermal processing, including induction hardening, to a worldwide customer base. They specialize in heat treating for industries such as automotive, aerospace, medical, and military. Additional offerings include machining, laboratory testing, and workholding solutions.
Based in Houston, TX, National Heat Treat provides comprehensive industrial heat treatment services. The company specializes in various metallurgical processes, including hardening, tempering, annealing, and potentially induction hardening, serving a range of manufacturing and industrial sectors to enhance material properties.
Based in Waterbury, CT, Nelson Heat Treating Co. Inc. provides comprehensive hardening and heat treating services nationwide. They specialize in processes like case hardening, carburizing, annealing, stress relieving, carbonitriding, and tool & die hardening. With 68 years of experience, they offer light to deep case hardening for industrial and automotive components.
Based in Zelienople, PA, Penna Flame Industries, Inc. specializes in robotic induction and surface hardening applications. Serving the steel, mining, railroad, machine-tool, and automotive industries since 1968, they are committed to high quality and repeatability. They offer responsive heat treating services with an average 4-6 business day turnaround.
Quality Heat Treating, Inc. is a family-owned heat treatment company based in Burbank, CA. They provide a wide range of services, including induction hardening, atmosphere hardening, vacuum hardening, annealing, and nitriding. The company serves the aerospace, medical, automotive, and commercial industries with comprehensive heat treatment solutions.
Rex Heat Treat, based in Lansdale, PA, is a commercial heat treater with two advanced facilities. Since 1938, they have provided extensive services including hardening, tempering, carburizing, austempering, and vacuum heat treating. They serve critical industries like aerospace, medical, and defense, focusing on precision and quality.
Southwest Metal Treating Corp, based in Fort Worth, TX, offers comprehensive metal treating services with 40 years of experience. They serve industrial clients in cutlery, hand tool manufacturing, industrial machinery, and turbine and turbine generator manufacturing, providing specialized heat treating solutions to enhance component performance.
Based in Houston, TX, Specialty Heat Treat, Inc. provides advanced industrial metal heat treatment services. They specialize in processes like annealing, hardening, tempering, and stress relieving, serving oil and gas, aerospace, and automotive sectors. The company is committed to high-quality standards, utilizing state-of-the-art equipment and experienced professionals.
Based in Cincinnati, OH, Cincinnati Steel Treating Company provides industrial heat treatment services, specializing in induction hardening for a wide variety of steel parts. Their comprehensive offerings include annealing, carburizing, nitriding, and straightening. The company is IATF 16949:2016 and ISO 14001:2015 registered.
Based in Round Rock, TX, Texas Heat Treating, Inc. provides comprehensive heat treating services, crucial for various industrial applications. The company is certified to AS9100D, ISO 9001, and ISO 17025 standards, ensuring compliance and quality. They serve demanding sectors like the aerospace industry, upholding best practices and customer requirements.
Based in Waukesha, WI, ThermTech is a commercial heat-treating company providing a wide range of thermal processing services. They specialize in various heat treatment processes, including induction hardening, to serve diverse industrial and manufacturing customers.
Based in Cleveland, OH, USA Heat Treating offers commercial heat treatment services for diverse manufacturing industries. Established in 2002, the company prioritizes quality and turnaround, holding ISO 9001 certification for automotive supplier requirements. Their capabilities include continuous austemper, neutral hardening, and stress relieving.
Metlab Heat Treating, Nitriding, Induction Flame Hardening provides precision heat treatment services from Quakertown, PA. Capabilities include induction flame hardening, vacuum heat treating, brazing, atmospheric heat treating, and cryogenic treatment. They serve North American clients in medical, defense, aerospace, nuclear, and tool & die industries.
Based in Garden Grove, CA, Varco Heat Treating Company provides reliable metal heat treating services. Established in 1908, the company is NADCAP, ISO 9001:2015, and AS9100D accredited, ensuring high-quality and timely service for various projects.
Worldwide Heat Treat provides a range of heat treating services from its Houston, TX facility. Specializing in hardening, tempering, and metallurgy, the company also offers hardness testing, quenching, and sandblasting. They feature 40-foot furnaces and coordinate convenient pick-up and drop-off services for clients.
Bodycote is a global provider of thermal processing services with numerous facilities across the United States. The company offers a wide range of heat treatment solutions, including specialized induction hardening services, designed to enhance the mechanical properties and wear resistance of ferrous components for industrial applications.
Aalberts Surface Technologies, formerly Paulo, offers precise and repeatable thermal processing for mission-critical industrial parts. As experts in various heat treatment services, they provide comprehensive solutions for complex processing needs. The company serves diverse industries from its facilities across the United States.
Advanced Heat Treat Corp. offers commercial heat treatment and metallurgical solutions from facilities in Iowa, Michigan, and Alabama. Specializing in induction hardening, they operate eight machines capable of processing parts up to 54 inches long, 60 inches in diameter, and 800 lbs, addressing wear, corrosion, and abrasion.
Based in Mason, OH, Ashley Ward specializes in induction heat treating for a range of metal parts, including drive shafts, bearings, and camshafts. They also offer diverse machining services such as CNC turning, centerless grinding, gear hobbing, spline rolling, and multi-spindle screw machining for industrial applications.
Based in Greenville, SC, Bluewater Thermal Solutions provides specialized induction hardening services. They offer selective hardening for industrial components such as gears, sprockets, and powder metal parts, utilizing fully automated induction equipment. The company is NADCAP accredited, ensuring high-quality thermal processing for customers.
Curtiss-Wright Surface Technologies provides direct induction hardening services, offering advanced engineered solutions for component surface enhancement. Specializing in shot peening, laser peening, and thermal spray coatings, the company operates multiple US facilities. They support diverse critical industries with specialized processing for high-performance industrial applications.
Based in Detroit, MI, Michigan Flame Hardening provides specialized thermal processing services, including both flame and induction hardening. They enhance the durability and wear resistance of critical components such as die sections, gears, and rails for various industrial applications, offering custom solutions tailored to specific client needs.
HTS AmeriTek, LLC provides expert on-site and off-site metal heat treating services from facilities including La Porte, TX. They specialize in precision heat treatment to enhance component durability, performance, strength, and hardness. Serving diverse industrial sectors like refinery, fabrication, petrochemical, aerospace, and manufacturing, the company offers reliable metal surface and post-weld heat treatment solutions.
Based in Pontiac, MI, Heat Treating Services specializes in various heat treating solutions for large-volume manufacturers. The company primarily serves machiners of rough castings and forgings, providing critical services to improve material properties. They aim to address industry frustrations related to heat treatment quality and availability.
Induction Heat Treating Corporation provides specialized induction hardening, case hardening, tempering, and annealing services. With facilities in Crystal Lake, IL, and Waukesha, WI, they also offer coils and tooling. The company is ISO 9001:2015 and CQI9 certified, ensuring high-quality heat treating solutions for industrial clients.
Based in Clintonville, WI, Precision Thermal Processing provides thermal process services for metals. Capabilities include hardening, normalizing, annealing, stress relieving, vacuum processing, and induction processing. The company also offers metallurgical analysis and serves industrial clients in transportation, tool & die, and power generation.
Based in Newport, AR, Southwest Steel Processing LLC specializes in heat treating services, including induction hardening, normalizing, quench and temper, and annealing. They also provide forging and machining. The company serves industrial clients in sectors such as railcar, oil & gas, mining, construction, and renewable energy.
S&P Heat Treating offers comprehensive metal heat treatment services, including case hardening, to enhance product durability. Operated by degreed metallurgists with over 30 years of experience, the company serves industrial sectors such as Navy, Ford, GM, and Nuclear. They hold ISO 9001:2015 certification.
Based in Alverton, PA, Summit Machine Co, Inc. specializes in induction hardening services. The company serves clients in the Tri-State area of Pennsylvania, Ohio, and West Virginia, leveraging over 40 years of experience in the field.
Supreme Steel Treating Inc. located in South El Monte, CA, has provided heat treating services since 1982. Their in-house capabilities include induction hardening, vacuum and atmosphere hardening for tool steels, high-speed steels, and alloys. They also offer annealing, carburizing, carbonitriding, stress relieving, tempering, and cryogenic treatments.
U.S. Axle, Inc. based in Pottstown, PA, is a contract manufacturer for OEMs, producing custom heavy equipment axles, shafts, and cylinders. Their integrated processes include precision induction hardening, deep hole drilling, honing, and machining. Serving industries like agriculture, construction, heavy trucks, and rail, they deliver reliable, purpose-built component solutions.
Zion Industries, Inc. provides high-volume induction heat treatment and process development services for metal parts. They specialize in hardening, bonding, and softening conductive materials using precise electrically heated coils. With over 40 years of experience, Zion operates facilities in Ohio, North Carolina, and Michigan.
Based in Houston, TX, Houston Heat Treat specializes in providing comprehensive heat treating services, including induction hardening. They utilize electrical current and a quenching medium for selective hardening processes, catering to various industrial needs for shallow or deep hardening of metal components.
Heat Treating Technologies Inc. provides industrial heat treating services, assisting customers with extensive knowledge and reliable lab services. This experienced company offers dedicated support staff to ensure project success, focusing on various industrial heat treatment applications.
Induction Hardening Specialists provides comprehensive heat treatment services, focusing expertise on induction hardening, particularly for gear teeth. The company offers custom orders to client specifications, emphasizing quality workmanship and timely service. They cater to dynamic industries requiring precision hardening solutions.
Based in Pasadena, TX, ISP Heat provides specialized induction heating services, including induction hardening, brazing, tempering, and annealing. The company develops and implements custom induction solutions for various industrial applications, offering process development, R&D, and handling small to medium production runs for its clients.
Peters' Heat Treating, Inc. is a thermal processing services provider with corporate headquarters in Meadville, PA. The company offers a wide range of metallurgical solutions, including specialized induction hardening services. They cater to various industrial sectors, ensuring precise treatment for critical components and materials.
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Effective Hardened Depth (EDH) is typically specified as the distance from the surface to where the hardness drops to a specific percentage (often 50% or 80%) of the surface hardness, or to a specific hardness value (e.g., HRC 50 or Vickers 500). Clearly define the minimum and maximum EDH on your drawing, as well as the method for measurement (e.g., micro-hardness traverse). Simply stating "case hardened" is insufficient and leaves too much to interpretation.
Quench media (water, polymer, oil) significantly influences both cooling rate and resulting stress. Water provides the fastest quench but poses the highest risk for distortion and cracking, especially on complex geometries or crack-sensitive steels. Polymer quenchants offer controlled cooling rates, balancing hardness development with reduced distortion and crack risk. Oil is generally the slowest and safest, but may not achieve maximum hardness for all materials or desired case depths. Matching the media to the part's geometry, material, and required properties is crucial for process success.
Induction hardening is most effective on medium to high carbon steels (0.35-0.60% carbon) and certain alloy steels due to their ability to form a hard martensitic structure upon rapid cooling. While some grades of ductile iron can be induction hardened, gray cast iron typically does not respond well due to its graphite structure inhibiting martensitic transformation. Most austenitic stainless steels are non-hardenable by this method; however, martensitic stainless steels can be induction hardened. Always consult with the supplier regarding your specific material's hardenability.
Distortion is a primary concern. Mitigation strategies include: pre-machining parts closer to final dimensions before hardening (leaving minimal grind stock), optimizing coil design and power density for uniform heating, carefully selecting quench media and flow for controlled cooling, and utilizing specialized fixtures. For critical dimensions, specifying allowable distortion limits upfront enables the supplier to build these considerations into their process development and potentially incorporate post-hardening straightening or grinding. Understanding the part's original residual stresses also plays a role.