- Acme Gear Company
 - Manufacturers of precision gears. - Aero Gear, Inc.
- Manufacturer of precision gears, gearbox housings, and assemblies for the aerospace industry.
- Alpha Gear Drives, Inc.
- Line of precision planetary gear reducers.
- American Gear Manufacturers Association
- AGMA is a trade association representing manufacturers and users of gears and gearing products, suppliers of equipment and services to the industry, individual consultants and academicians.
- Artec Machine Systems
- Manufactures' representative and agency for gearbox repair and inspections, lubrication systems, and more.
- Bearing Belt Chain Co
- Supplier of quality bearing and power transmission parts. three locations in the Southwest United States and ships products around the world.
- Boston Gear
- Manufacturer of power transmission components including speed reducers, gears, motors, bearings, AC and DC drives, clutches, and brakes.
- Butler Gear Company, Inc.
- Specialises in gear manufacturing for all types of industrial needs from production run down to one piece: CNC machining, cutting, shaping, grinding, shafts, broaching, keyway and bevel.
- C-B Gear and Machine, Inc.
- Specialising in spur, worm, helical, bevel, and herring bone gears, as well as gear boxes.
- Chardam Gear Company, Inc.
- Experienced in gear grinding, spur and helical gears, splined shafts, curvics, housings and gearboxes.
- Chicago Gear Works
- Offers a full range of custom and standard gears for industrial and commercial applications.
- Cleveland Gear
- Offering power transmission equipment.
- Cote Industries, Ltd.
- Manufactures OEM and replacement sprockets for sawmills, pulpmills, and other industrial applications.
- Crest Geartech
- Exports timing gears, sprockets, hubs, transmissions, shafts, sleeves, spindles, and die forgings.
- Curtis Machine Company
- Manufactures right angle, straight bevel and spiral bevel gear boxes and gear cases, parallel shaft speed reducers as well as off-angle bevel gear drives.
 Datum Engineering
- Manufactures keyways, squares, hexagons, and splines.- Dayton Gear & Tool
- Custom manufacturer of spur, bevel, helical, and worm gears, splines, ratchets, and more. Also offers gear box repair and rebuild.
- Excel Gear
- Manufactures custom gears, high speed spindles, and power transmission systems.
- Fesca Pacific Gears
- Manufacturers of spurs, helicals, worms, worm wheels, racks, spiral and straight bevels, made to customer specification.
- GAM
- Provides application engineering support for precision servo couplings, gear reducers, and motion control products.
- Gear Industry
- Information source for the gear manufacturing industry.
- Gear Motions, Inc.
- Standard and custom precision gear manufacturer specialising in ground, spur, helical, bevel, and other speciality gear grinding and cutting services.
- Gear Works, The
- Full service gear manufacturing facility providing precision gear products and power transmission services.
- Gear-net Japan
- Gear machines, gear components manufacturers.
- Gleason Corporation
- Producer of machinery for the production, finishing, and testing of gears.
- Globe Gear
- Free industrial gear & machine parts catalogue, engineering & materials information, gear identification. Services: standard, custom, metric gears; emergency breakdown service; OEM quantities.
- Goang Chyan Industry, Ltd
- Manufacturer of precision gears.
- Great Lakes Industries
- Designs and manufactures mechanical power transmission products such as sprockets, pintle chain sprockets, couplings, gears and torque limiters.
- Greenshpon Engineering Works Ltd.
- Manufacturer of standard and tailor-made gears and gear pumps for all types of industrial applications. Site in English, German and Hebrew.
- Hermann's Tool and Machine Works
- Manufactures and repairs gears, splines, aircraft tools and fixtures, dies, pumps, and hydraulic cylinders.
- Hewitt & Topham
- Manufacturers of precision cut gears and precision engineering, serving a range of industries.
- Hi-Tech Gears Ltd.
- Manufactures automotive gears, main shafts, cam gears, and more.
- Horsburgh & Scott
- Manufactures, designs, services, and rebuilds industrial gearing and gear drives for application specific needs.
- Jamal Group, The
- Makes bevel gears, gear boxes, and machine implements.
- Ka-Wood Gear & Machine Co.
- Gear manufacturing company specialising in spur and helical gears, racks, internal and external splines, worm and worm gears, and more.
- Kitchener Gear Ltd
- Manufacturer of precision gears, boxes, grinding, shaving, splines, planetary assemblies, spiral and straight bevel miter gears.
- Kyung In Gear
- Manufactures gears for ship engines and press machines.
- Kyung-In Precision Machinery Co.
- Manufactures large sized gears and reducers.
- Maksan
- Produces gear parts for a variety of industries.
- Matex Co.
- Manufactures mechanical components, epicyclic and planetary gears, reducers, gearboxes, and actuators for use in electrical appliances and healthcare instruments including massage chairs.
- Max Power Gears
- Manufactures custom gearboxes.
- Midwest Gear
- Custom gear grinding and manufacturing.
- Milwaukee Gear Company
- Producer and heat treater of custom precision gearing and drives.
- miniGears
- Maker of metal gears that uses machined metal and powdered metal technologies. Site is in English and Italian.
- Motion Systems Incorporated
- Manufactures custom large gears.
- Niagara Gear Corporation
- Manufacturer of precision ground spur, helical, and pump gears.
- Perry Technology Corporation
- Manufactures gear and splines specialising in aerospace couplings and actuators.
- Prager, Inc.
- After-market solution provider for industrial gears and gearboxes. Custom designs, as well as repairs and overhauls of existing equipment.
- Precision Gear Company
- Supplier of custom manufactured gears.
- Precision Technologies International Limited (PTI)
- Manufactures gauges, gears, metal forming tools, and work holdings.
- Production Parts
- CNC machining, tooling & gear manufacture.
- Reggiana Riduttori Planetary Reduction Gears
- Reliance Gear Company Limited
- Producer of precision mechanical components, geared mechanisms, and electro-mechanical assemblies for the aerospace, defence, scientific instrument, and medical markets.
- Remy Barrere Engrenages
- Designer and manufacturer of gears including railways traction gears, diesel engine timing gears, and damping systems.
- Ribco Gears
- Exports bevel gears for tractors, automobiles, machinery, and railways.
- Riley Gear Corporation
- Manufacturer of precision spur and helical gears , shafts and custom power transmission designs, and gear boxes to AGMA class 15 specifications to 55-inch diameter.
- Sadhu Group
- Exports transmission gears, crown wheels, pinions, and forgings.
- SafeTorque
- Manufactures a line of mechanical ball and detent torque limiters for industrial applications.
- Sam Gong Gear Ind. Co.
- Manufacturers of gears including bevel, transmission, and synchronizer set.
- Schafer Gear Works, Inc.
- Precision cut spur and helical gears plus other machine components and precision parts.
- Six Star Group
- Manufacturer of gears for air screw compressers, textile machines, CNC lathes, machining centres, hydraulic pumps, auto parts, printing machines, and more. Based in Taiwan.
- Spiral Into
- Specialising in the manufacture of spiral and zerol bevels and hypoid, spur, helical, and warm gears.
- Sprocketco
- Maker of standard and custom flame-cut sprockets for conveyors and bucket elevators.
- Taiwan Chu-shiang Industrial Co., Ltd.
- Manufactures powder metallurgy products including self lubricating bearings, gear parts, pulley parts, automobile and motorcycle parts, and industrial machinery.
- TEK Engineering
- Manufactures machined parts, specialising in gear cutting and hobbing, CNC milling, turning, and general machining. Also designer and maker of underwater manipulators.
- Torque Transmission
- Manufacturing company offering timing pulleys, right angle gearboxes, and thrust bearings for low and fractional horsepower application. Torque Transmission features plastic and metal products with custom products available.
- Trojon Gear Manufacturing
- Manufacturing of gears, racks, shafts, CNC turning & milling, keyways broached and slotted. Servicing the aerospace, medical, crane & hoist mfg, automotive, mining & printing.
- Van Zeeland Manufacturing, Inc.
- Providing roller chain sprockets, spur gears, and belt pulleys for power transmission.
- Vancouver Gear Works
- Manufactures gears, sprockets and edger arbors for several natural resource industries. Serving Western Canada and beyond.
- VL Motion Systems Inc.
- Offering AC and DC gear motors, frequency drives, speed reducers, drum motors, and binder brakes and clutches. Also provides replacement parts for Eberhard Bauer gear motors.
- Yieh Chen Machinery Co.
- Specialises in the manufacturing of precision gears for machine tools, motor cycles, and industrial and agricultural machines.
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