| Company | Country | Product Type | Strong Product Types |
| 2000 Engineering | Korea | Thermal | SQF, Wire annealing |
| Abbott | USA | Thermal | Sintering Mesh Belts |
| ACE Furnace Company | India | Thermal | |
| Adencon Industrial Furnaces | Turkey | Thermal / Vacuum | Vacuum furnaces: HPGQ, Vertical Loaded, Temper |
| Advac Heat Treaters PVT | India | Vacuum | Small Single chamber -10 bar |
| Advanced Corporation for Material & Equipment | China | Vacuum | Special Horizontal Vac. / SinterHip |
| Advanced Vacuum Systems (AVS) Inc | USA | Vacuum | Nuclear Special Vacuum |
| AFC-Holcroft LLC | USA | Thermal | Sealed Quench / Pushers / Austempering |
| Aichelin Holding GmbH | Austria / Germany / China / Brazil/USA/India | Thermal | Sealed Quench / Gas Carb./ Pushers / Pit / Ring Hearth / Belt Type |
| Aichelin Unitherm Pvt | India | Thermal | Sealed Quench / Pushers / Pit / Belt Type |
| Ajax Tocco Magnethermic | USA / Canada / Mexico / China / Germany / Japan / Korea / UK | Induction | |
| ALD Dynatech | India | Vacuum | LPC / VC |
| ALD France (TIV+FNAG) | France | Nitriding | |
| ALD Vacuum Technologies GmbH | Germany | Vacuum | LPC / VC |
| Alfing (Maschinenfabrik Alfing Kessler GmbH) | Germany | Induction | Induction Machines for Crankshaftrs |
| Alhern Martin | USA | Thermal | Mesh Belt Furnaces |
| ALM Industrial Furnace | China | Aluminum | Melting/T6 |
| ALONSO SCHAUB FORNOS | Brazil | Thermal | Batch |
| ALSER TEKNİK SERAMİK | Turkey | Thermal | Lab and Ceramic Furnaces |
| AMP Sp. z o.o. | Poland | Vacuum | |
| ANTAL | Hungary | Thermal | Forge/Car Bottom |
| Antares | Ukraine, | Vacuum | EB melting |
| Applied Thermal Technology | USA | Vacuum | Water Quench Vacuum Furnace |
| ARES (Member of SMS Furnace Technology) | China | Thermal | Roller Hearth/Rotary |
| ARMIL C.F.S., INC | USA | Thermal | Batch Furnaces |
| Associated Industrial Furnaces | India | Aluminum | Coil Annealing/Billet |
| ATBIN MFG &Eng | Iran | Thermal / Aluminum | Drop Bottom solution/bell |
| ATI furnaces | France | Thermal | Car Bottom / Rotary/Batch |
| AVF Baoji Advanced Vacuum Furnace Industry Co. LTD | China | Vacuum | Horizontal Standard Furnaces |
| AZ-Industrial Furnaces | China | Aluminum | Vertical Quench / Annealing |
| Bekaert Solaronics | France, USA, Brasil, China, Indonesia | Thermal | Infrared furnaces and dryers |
| Beavermatic | USA | Thermal | Sealed Quench / Tip-Up |
| Befay Makina Sanayi Veticaret | Turkey | Aluminum | Aluminum/Melting |
| Beijing Hua Hai Zhong Yi | China | Vacuum | Standard Vacuum |
| Beijing Huaxiang | China | Vacuum | Vertical Palletizing Dies |
| Beijing Sevenstar | China | Vacuum | High Vacuum Brazing |
| BemakTherm Industrial Furnaces | Turkey | Thermal/Aluminum | Low Temp. Furnaces |
| Benco | India | Thermal | Mesh Belts |
| Bharat Engineering Ind. | India | Thermal (AFC-H) | Carburizing Furnaces |
| BMI Fours Industriel | France | Vacuum | LPC |
| Borel Swiss AG | Switzerland | Thermal | Standard Furnaces |
| Bosio (Aichelin Group) | Slovenia | Thermal | Box/Pit |
| BRIMET | China | Vacuum/Thermal | Vertical Thermal |
| BSN Thermprozesstechnik GmbH | Germany | Thermal | Pre-Heating of Blanks for Press Hardening |
| BTU | USA | Thermal | IR/Precision-MeshBelt/Metallization |
| Caltherm Ltd | UK | Thermal | Industrial furnaces, ovens and dryers |
| Cambridge Vacuum Engineering (CVE) | UK | Vacuum | Horizontal Vacuum |
| Can Eng International Furnace Ltd. | Canada | Thermal / Aluminum | Mesh Belts / Basketless W.L BHTS/PAQ |
| Canefco | Canada | Thermal / Aluminum | Annealing |
| Carbolite | UK | Thermal / Aluminum | Box drop bottom |
| CEC | USA | Aluminum | Sand removal/coil annealing |
| Centorr Vacuum | USA | Vacuum | Lab /Nuclear tube/Sintering |
| Chaing Wen Enterp. | Taiwan | Thermal/Aluminum | Drop Bottom/Copper |
| Changchun FAW | China | Thermal | Pushers |
| Changzhou Kohand | China | Thermal | Forging furnaces |
| Chongqing Changjiang | China | Thermal/Aluminum | Car forging/pusher |
| CHS Asia | Thailand | Thermal/Vacuum | Sealed Quench / Vertical vacuum |
| Chugai Ro | Japan / China / Taiwan / Indonesia / Thailand | Thermal | Continuous furnaces for carburizing / Al. annealing |
| Cieffe Forni Industriali | Italy / China | Vacuum/Thermal | Single chamber vacuum |
| CM Furnaces | USA | Vacuum/Thermal | Box / Lab |
| CMI Industry | USA | Thermal | Roller Hearth/Tilt top |
| Codere S.A. | Switzerland | Thermal | Modular system |
| Cofi SpA | Italy | Thermal | |
| Combustol Industria | Brazil | Vacuum/Thermal/Alum. | Integral quench/Melting |
| Consarc / PV / T | UK / USA/ China | Vacuum | Vacuum Melting/Al. Brazing |
| Cremer | Germany | Thermal | High Tem Sintering |
| Custom Electric Furnace | USA | Thermal | Box |
| DAEHAN ELECTRIC HEATING CO | South Korea | Thermal | Aluminum Brazing |
| Daido Steel | Japan | Thermal/Vacuum | Roller hearth furnaces STC/Continuous Vacuum |
| Daiki Aluminum Industry | Japan | Aluminum | Meting |
| Despatch | USA / China / Germany | Thermal | Drop Bottom |
| Divine Tianjin | China | Thermal | Carburizing pushers |
| Dongwoo Heat Treatment | South Korea | Thermal/Aluminum | Continuous belt furnaces, CAB |
| Dotech GmbH | Germany | Thermal | Sealed Quench /Pushers/M. belts |
| Dowa/BBI/High Temp | Japan / India / China / Taiwan | Thermal | CryoTemper® |
| Drever/DIFurnace | UK/USA | Thermal | Nuclear Tube continuous |
| Ebner Industrieofenbau GmbH | Austria / China / USA / India | Non-Ferrous | Hydrogen Bell/ Continuous al. solution lines/Pusher/Muffle |
| ECM Technologies | France | Vacuum | LPC multichamber |
| EFCO | South Africa | Thermal/Vacuum | Furnaces for Glass Indust. |
| EFD Induction GmbH | Germany | Induction/Brazing | |
| EISENMANN SE | Germany / Brazil / USA / UK / France / India / China / Spain | Thermal | Continuous atm. Furnace Aluminium |
| Electric Furnace | USA | Thermal | Continuous |
| ElectroHeat AB | Sweden | Atmosphere /Aluminum | Batch furnace |
| Electromechanika | Russia | Vacuum/Thermal/Induction | Titanium & Aluminium Treatment; Vacuum Oil Hardening; R&D Furnaces |
| Electrotherm Industry | Israel | Thermal | Rotary Hearth / Magnesium |
| Elino | Germany | Thermal furnace | Continuous hardening/MIM |
| Eliog Industrieofenbau GmbH | Germany | Thermal | |
| Elnik | USA | Vacuum | MIM furnaces |
| Eltro GmbH | Germany | Thermal | Plasma Nitriding |
| EMA Indutec GmbH | Germany / China | Induction | |
| EMAG eldec Induction GmbH | Germany | Induction/Brazing | |
| Emaye Tav Firinlari Imalati | Turkey | Aluminum | Alumin. Batch. |
| Engineered Production Systems | USA | Thermal | Water quench |
| Envita | South Korea | Thermal/Aluminum | Rapid Al. Melting / Bell furnaces |
| Epcon | USA | Thermal / Vacuum | Thermal ovens |
| FAW Jiaxin | China | Thermal | Pushers / SQF |
| Fengdong | China | Thermal/Vacuum | Sealed Quench / Vacuum furnaces |
| FESP SA | Switzerland | Thermal/Brazing | For watch, jewellery, medical industry |
| FK Industrieofenbau + Schutzgastechnik GmbH | Germany | Thermal | |
| Fluidtherm Technology P Ltd | India | Thermal | Sintering Mesh Belt |
| FORNOS JUNG LTDA | Brazil | Thermal | Batch |
| Foshan Takasago Industrial Kilns Co.; Ltd | China | Thermal | Continuous, batch and rotary furnaces |
| Foshan Younger | China | Thermal/Vacuum | Gas / Vacuum Nitriding / pit |
| SAFED (Aichelin Group) | Switzerland | Thermal | Continuous |
| Fuji Electronic Industry | Japan | Thermal/Vacuum | Annealing / Brazing / Induction |
| Furnace Associates | USA | Thermal | Box furnaces |
| Furnace Engineering | Australia | Thermal/Vacuum (Ipsen) | Composite ovens / Nickel Sinter |
| Furnace EngineeringCompany | New Zealand | Aluminum | Melting crucible / Glass |
| G. H. Induction GmbH | Germany | Induction | |
| Gadda Industrie Srl. | Italy | Thermal/Aluminum | Bogey and continues forging |
| Gasbarre Group Jl Becker/Sinterita, C.I. Hayes | USA | Thermal | Sintering / Mesh Belt / Vacuum oil quench |
| Gautschi Engineering | Switzerland / China | Aluminum | Annealing / Al. Melting |
| Gero | Germany | Vacuum/Thermal | High Temp / Sintering /MIM |
| Gillespie & Powers | USA | Aluminum | Melting |
| GM Enterp. | USA | Vacuum | Sintering / vertical vacuum |
| Guangdong Kaixuan Vacuum | China | Vacuum | Single chamber. |
| Guangdong Strong Metal | China | Thermal | Hardening / Temper Mash belts |
| GUSU Electric Furnace | China | Thermal | Mesh Belts |
| H. T. Solutions | Italy | Vacuum | |
| HANWHA TECHM | South Korea | Thermal | Ferrous Metal HT |
| Harper Intern. | US | Thermo Product | High Temp / Graphitization |
| HEF Durferrit GmbH | Germany | Salt Bath | Salt Bath, Carburizing, Carbonitriding, Nitrocarburizing, Hardening, Boriding, Tempering |
| High Heat Furnace Indust. | Taiwan | Thermal | Pit, Batch |
| High Temp Furnaces (Dowa) | India | Thermal | SQF, Pusher / CAAB / Mesh belt |
| Hind High Vacuum | India | Vacuum | Standard and special vacuum |
| Hingassa | Spain | Thermal | Pusher |
| Hirochiku Co., Ltd | Japan / Thailand | Thermal / Aluminum | Efficient aluminum melting |
| HOFMANN | Germany | Thermal | Car bottom furnaces |
| Hornos Alferierff | Spain | Thermal | Continuous furnace |
| Hou Torng Eng. Co. | Taiwan | Thermal | Mesh Belt |
| HTF | USA | Thermal | Box furnaces |
| Huisen | China | Thermal / Vacuum | |
| IHI Machinery and Furnace (Japan Hayes 2009) |
Japan | Vacuum | Vacuum / LPC (Vacuum Oil) Hydrocarbon Degreaser |
| INDAID Engineers PVT | India | Thermal / Vacuum | Bogie Hearth / SFQ / Vacuum |
| Inductoheat Europe GmbH | Germany | Induction | |
| Industrieofen- & Härtereizubehör GmbH Unna | Germany | Thermal | Hardening and annealing systems |
| Industrieofenbau Aue GmbH | Germany | Thermal | Chamber, continuous, salt bath |
| Insertec | Spain | Thermal / Vacuum | Die casting furnace |
| Institue for Ceramisc Kerammash | Ukraine | Thermal | Gas Fired Strip Annealing |
| International Thermal Systems | USA | Thermal / Aluminum | Box/Solution Heat / Car Bottom |
| IOB Industrieofenbau GmbH | Germany | Thermal | Roller Hearth Continuous line |
| Ion Heat Advanced Processing Technology | Columbia | Thermal | Hot Wall Ion Nitriding |
| Ionitech | Bulgaria | Thermal | Ion Nitriding |
| IPC-Prompechi, Ltd | Russia | Thermal | Batch furnaces |
| Ipsen International GmbH | Germany / USA / Japan / China / India / Malaysia | Vacuum / Thermal | Vacuum / Standard Furnaces LPC / SQF/ pushers |
| ITG Induktionsanlagen GmbH | Germany | Induction | |
| IVA | Germany | Thermal | Nitriding, Carburizing, Carbonitriding, Nitrocarburizing, Tempering, Annealing |
| Jiangsu ECCO Furnace | China | Thermal | SQF / Pit / Pusher |
| Jilin Plate | China | Thermal | Pusher furnaces |
| Keith Company | USA | Thermal | Batch finances |
| KGO | Germany | Thermal | Gas Nitriding |
| Kohnle (Wolfgang Kohnle Wärmebehandlungsanlagen GmbH) | Germany/India | Thermal | Mesh Belt, Retort Mesh Belt Furnaces, Roller Hearth |
| Koyo Seiko | Japan | Vacuum | Horizontal furnaces |
| Koyo Thermo Systems | Japan | Thermal / Aluminum | Continuous hardening line |
| Kumagawa | Japan | Thermal | Box furnaces |
| KV-Titan | Russia | Vacuum | EB melting |
| KYK | Japan / China | Thermal line | Aluminum Brazing |
| L&L Special Furnace | USA | Thermal | Box High Temp |
| LAC | Czech Republic | Thermal | Large car bottom |
| Lakshani Vacuum | India | Vacuum | Vacuum Sintering |
| La Forni Tecnica Srl | Italy | Thermal | Batch, continuous and nocolock brazing furnaces |
| Leeds and Northrup (JB Furnaces) | UK | Thermal | Carburizing / Nitriding Pit |
| Lenzen ATT GmbH | Germany | Thermal | |
| Lindberg | Argentina | Thermal | SQF / Batch Carburizing |
| Linn High Therm | Germany | Thermal / Vacuum | Box furnace / Lab |
| LOI Thermprozess GmbH | Germany | Thermal / Aluminum | Roller Hearth / Hydrogen Bell / Al.Melting Double Chamber |
| Lucifer Furnaces | USA | Thermal | Box/Small oil quench |
| LW Furnaces | USA | Vacuum | MIM/Sintering |
| Mahler | Germany | Thermal | Continuous furnaces for brazing, annealing, hardening, sintering |
| Major | Australia | Aluminum | Melting |
| Major Engineering Company | Australia | Thermal / Aluminum | Aluminum / Melting |
| Marusho Denki Co., Ltd | Japan | Thermal | High Temp. Sintering |
| MATTSA | Mexico | Thermal | Sealed quench / pushers (AFC-Holcroft partner) |
| MEAPFORNI srl | Italy | Thermal, Vacuum for Steel and Aluminum, Hardening and Nitriding | Full Range of Thermal & Vacuum Furnaces and Industrial Lines (Chamber, Roller, Conveyor, Continuous, Specialities) |
| Metaltrad Equipamentos Industriais | Brazil | Thermal/Vacuum | Roller Hearth furnace |
| MIOBA Mitteldeutscher Industrie-Ofenbau GmbH & Co. | Germany | Thermal | Chamber and Continuous Hardening, Carburizing, Tempering and Annealing |
| MT Forni Industriali | Italy | Thermal / Glass | Batch / Bell |
| Nabertherm GmbH | Germany | Thermal | Tempering, annealing, hardening and quenching, solution annealing, forging, curing, preheating, drying, ageing |
| Nachi Fujikoshi Corp. | Japan | Thermal / Vacuum | Sealed Quench / Vacuum washers |
| Nakal | Russia | Thermal | Catalytic Nitriding |
| Nakanihon-Ro Kogyo | Japan | Vacuum | Batch line |
| Nanjing Changjiang Furnace | China | Thermal / Aluminum | Basketless Wheel Line |
| Narita Techno Co., Ltd | Japan | Thermal / Aluminum | Small Solution |
| NIANDA | China | Thermal / Aluminum | Continuous Al. HT / Mesh Belts |
| Nihon Techno | Japan | Vacuum | Horizontal Vacuum furnace |
| Nitred Spe LLC | Russia | Thermal | Nitriding / Carburization |
| Nitrex Metal Inc. | Canada / Poland / China | Thermal | Control Gas Nitriding |
| Nolzen (A. Nolzen Industrieofebau GmbH & Co. KG) | Germany | Thermal | |
| Olson Industries | USA | Thermal | Car Bottom / Sintering |
| OOKSAN | South Korea | Thermal | Ferrous metal HT / Carburizing |
| Oriental Engineering | Japan | Thermal / Vacuum | SQF / Vacuum |
| Otto Junker | Germany / Czech Republic | Aluminum | Jet Heating coil annealing / melting al. |
| PADELTTHERM GmbH | Germany | Thermal | Hardening, Annealing, Tempering , Carburizing, Nitriding |
| Park Thermal Intern. | Canada | Thermal | Box furnace |
| Peer Energy GmbH | Germany | Thermal | Sealed Quench |
| PlaTeG | Germany | Thermal | Plasma Nitriding |
| PowerMax | China/Taiwan | Thermal | Sealed Quench |
| Premier Furnace Specialists | USA | Thermal | Batch |
| Prestige Thermal | South Africa | Thermal / Vacuum | Walking beam furnaces |
| Proterm Termal | USA | Thermal / Vacuum | Rebuilds/Hot zones |
| PT Win Electroindo | Indonesia | Thermal / Vacuum | Al. Melting / Continues |
| PVA Tepla | Germany | Thermal | Ion Nitriding |
| Pyradia | Canada | Thermal | Drop Bottom |
| Pyromaitre | Canada | Thermal | Rapid tempering / stress reliving |
| PZP Komplet | Czech Republic | Vacuum | Vacuum Degassing |
| RAD CON | USA | Thermal | Hydrogen Bell |
| Remix S.A | Poland | Thermal / Aluminum | Melting / Galvanizing line |
| Retech LLC | USA | Melting Furnaces | PAM,EB,VIM,VAR |
| RGB | UK | Thermal | Nitriding/ small AL melting |
| Rogers | USA | Thermal | Aluminum Brazing |
| ROHDE Schutzgasöfen GmbH | Germany | Thermal | Pit / Gas Ion Nitriding furnace |
| Rozai Kogyo Kaisha | Japan | Thermal / Aluminum | Cont. Coil annealing |
| Rubig GmbH | Austria / Slovakia / USA | Thermal / Vacuum | Plasma Nitriding/HPQ |
| RURASERO KOGYO | Japan | Thermal | Carburizing Batch |
| SABE FORNI S.R.L. | Italy | Thermal | Brazing & Sintering Continuous, Aluminium Treatment |
| SAC | South Korea | Thermal / Aluminum | LPC Pusher / Aluminum Process |
| SAET S.p.A. | Italy | Induction | |
| Salar Mfg. | USA | Vacuum | Large vacuum for Ti. |
| San Yung | Taiwan/China | Thermal | Mesh belt for fasteners |
| Sanken Sangyo | Japan/Indonesia | Thermal and Melting | Die casting furnaces |
| SARNES ingenieure GmbH & Co KG | Germany | Thermal | Sintering Mesh belts/MIM |
| SAUDER EQUIPAMENTOS INDUSTRIAIS | Brazil | Thermal | Batch |
| Schlager Industrieofenbau GmbH | Germany | Thermal | |
| Schmetz | Germany | Vacuum | Hardening / Brazing |
| Schmitz Apelt | Argentina | Thermal | Batch |
| Schwammberger (Hermann Schwammberger Industrieofenbau) | Germany | Thermal | Continuous furnaces for brazing, annealing, hardening, sintering |
| Schwartz GmbH | Germany | Thermal | Jet heating |
| Sciprotec Industrial Plant Engineering GmbH | Germany | Thermal / Aluminum | |
| SECO/WARWICK S.A | Poland / China | Vacuum / Thermal | Vacuum / CAB |
| Sellacan Industrieofen GmbH | Germany | Thermal | CAB Brazing Furnaces, Annealing Furnaces and Dryers |
| Selas | USA | Thermal | Car bottom |
| SET | France | Aluminum | Drop Bottom |
| Shanghai Advanced Metallurgical Technology (Samt) | China | Vacuum | Custom Design Vacuum |
| Shanghai Chenhua Electric | China | Thermo | Reheat furnaces |
| Shanghai Zhongjia | China | Thermal | Roller hearth / Mesh belts/Box |
| Sheaffer | USA | Aluminum | Casting / Melting alum. |
| Simuwu/Shenyang Hengjin (HJZK) | China | Vacuum | Vacuum sintering |
| Shenyang Jiayu | China | Oil quench | |
| Shenyang Vacuum Technology | China | Vacuum | |
| Shimadzu Mectem | Japan | Vacuum | MIM and Superhard Alloy HT |
| SHIVANG FURNACES AND OVENS PVT LTD | India | Thermal | Continuous furnace |
| Shoryoku | China | Thermal | Aluminum Brazing (CAB) |
| Signature Vacuum | USA | Vacuum | Vacuum Melting |
| Simplicity | India | Vacuum | Brazing Horizontal |
| Simuwu/Shanyang Honjiang Vacuum Tech | China | Vacuum | |
| Sinfonia Technology Company Ltd | Japan | Thermal | Strip Annealing |
| Sistem Makina | Turkey | Thermal | Steel & Aluminum Industry |
| Sistem Technik | Turkey | Thermal / Vacuum | Roller Hearth / Vacuum HPQ Nitriding LP. |
| SMS Elotherm GmbH | Germany | Induction | |
| SMSTechnologies | India | Thermal/Nonferr. melting | Pot Furnaces |
| SMT Maschinen- und Vertriebs Gmb | Germany | Thermal | Reflow soldering |
| Snijstaal BV | Netherlands | Thermal | |
| Solar | USA | Vacuum | |
| Solo Swiss Group | Switzerland / China | Thermal | Atmosphere Furnaces |
| Souzhou Guso Electric Furn. | China | Thermal | Mesh Belt |
| SRS Industrieofenbau GmbH & Co. KG | Germany | Thermal | Industrial Furnaces |
| Stein Heurtey | Spain | Thermal | Roller Heart / Rototherm |
| Steremat Elektrowärme GmbH | Germany | Induction | |
| Surface Combustion Inc. | US / Canada | Thermal / Vacuum | Sealed Quench / Roller H / |
| Suzhou Boneng Furnace | China | Aluminum | Melting |
| Suzhou Minsheng Electric Xian Minsheng Electro -Heating | China | Thermal/Aluminum | Pit / Drop Bottom |
| Suzhou Xin Ling Electric | China | Thermal | Mesh Belts |
| Suzhou Zhenwu Electric Furnace | China | Vacuum | Vacuum Melting |
| Suzhou Zhongmenzi Tech. Co | China | Thermal / Aluminum | SQF / Al. Melting / Al. Log Pusher |
| SysThermS | Germany | Vacuum | HPQ horizontal |
| Takasago Industry Co.,Ltd | Japan | Thermal | Continuous, batch and rotary |
| Tainan Chin Chang Electrical Co | Taiwan | Thermal | Pit |
| TAV SpA. | Italy | Vacuum | Sintering / Aerospace applications |
| Technotherma India (Pvt) Ltd. | India | Thermal / Vacuum | LPC, Brazing, Vacuum Brazing, Hardening, Nitriding |
| Tecno Induzione s.r.l. | Italy | Induction | |
| The Electric Furnace | New Zealand | Thermal / Non Ferrous | Melting / Galvanizing line |
| Therelec Engineers | India | Thermal / Vacuum | |
| Thermal Technology | USA | Vacuum | Sapphire melting / SPS |
| Thermax | Argentina | Thermal | Batch |
| Thermconcept | Germany | Thermal / Aluminum | Box and retort pit furnaces |
| Thermocraft | USA | Thermal / Vacuum | High Temp Vacuum |
| Thermotec | Israel | Thermal / Vacuum | Batch / Vertical |
| Thermotic Services | Switzerland | Thermal | Thermal furnaces |
| Thorpe Technologies Inc. | USA | Aluminum | Alum. Melting |
| Tlon Technical (Wuxi) | China | Thermal furnace | Pit furnace |
| TM -Vacuum | USA | Vacuum | Lab and high temp Vacuum |
| Tokyo Furnace Industry | Japan | Thermal / Non ferrous | Die-casting |
| Toyo Ro | Japan | Thermal | Mesh belts |
| Trent Inc | USA | Thermal | Box furnace / Lab |
| Triad Engineering | India | Thermal | Atmosphere Furnaces |
| TUKI | Hungary | Thermal / Aluminum | Annealing |
| Ultra Furn | South Africa | Thermal | Box furnace |
| Ulvac | Japan | Vacuum | Continuous Vacuum Furnace |
| Umega AB | Lithuania | Thermal | Lab and box furnace |
| Unitherm | India | Thermal | Gas Carburizing |
| Uttis Industries | Romania | Thermal | Box and continues forging |
| Vac Aero | Canada | Vacuum | Vertical furnaces / oil quench |
| Vac Long Industrial Co., | Taiwan/China | Vacuum | MIM, Sintering, Hot Press |
| Vincent Vacuum Tech Co. Ltd. | Taiwan/China | Vacuum | |
| Wellman UK | UK | Thermal | Spare parts |
| Wellman USA | USA | Thermal | Roller hearth |
| Welmech | India | Thermal | SQF |
| WENDEL-TEC GmbH | Germany | Thermal | Small size furnaces |
| Wesman | India | Thermal / Aluminum | Rotary Hearth |
| Wienstroth Wärmebehandlungstechnik GmbH | Germany | Thermal | Industrial Furnaces |
| Williams Industrial Services | USA | Thermal | Sealed Quench |
| Wisconsin Oven | USA | Thermal | |
| Wistra | France / Germany / India / China / Romania | Thermal | |
| WMU | Germany | Thermal / Vacuum | Continuous furnaces for brazing, annealing, hardening |
| Wuxi Green Heat -Treatment | China | Thermal | Mesh Belts |
| Xian Aojie Electric | China | Thermal | Aluminum Brazing (CAB) |
| Yanchegshi Kangjie | China | Thermal | Aluminum Brazing (CAB) |
| Zentech | USA | Thermal | Large Car Bottom |
| Zhingshan Kaixiuan Vacuum | China | Vacuum | Annealing |