Gears & Gear Manufacturers

Gears are devices that engage mechanical motion or transfer torque and motion through a shaft, other gears or a series of parts. Teeth cut evenly into the external circumference of gears are designed to fit with corresponding gears; when one gear turns, both gears’ interlocking teeth cause the other gear to turn as well.

Gear shape and size determines gear performance. When interlocking gears differ in size from one another, the smaller gear will turn faster than the larger gear; the relationship between gear size and speed is called “speed ratio” or “gear ratio.” A gear’s number of teeth can be used to calculate a gear assembly’s ratio. For example, if two interlocking gears have 40 teeth and 20 teeth respectively, the gear ratio is 2:1. Different sized gears are used with one another to increase or reduce a shaft’s rotational speed in speed reducers, motors, transmissions, heavy machinery and clocks. Bevel gears, sprockets, rack and pinion spur gears, planetary gears, spline gears and helical gears are crucial in automotive motors and power transmissions, as are rear end gears and differential gears. Gear manufacturers produce a wide variety of gear configurations. Gear applications are variable and highly customizable, as different gear types can be configured in a virtually limitless number of ways to increase speed, reduce speed, transmit power, transmit motion or reduce the amount of force necessary to accomplish a task. From 20 foot diameter industrial gears to small worm gears and plastic gears, gear manufacturers make custom gear assemblies for nearly any application.

Some Leading Manufacturers

Omni Gear & Machine Corporation

Joliet, IL | 800-876-7216

Omni Gear & Machine manufactures a diverse range of custom gears. Whether you need spur gears, helical gears, sprockets, splines, or worm gears, we can create the right gear for your applications. Service and quality come first at Omni Gear & Machine. Every gear is manufactured to your specifications, and we will work with you throughout the whole process to ensure that we satisfy your production requirements. Let us know how we can serve you by giving us a call today!

Commercial Gear & Sprocket Company, Inc.

East Walpole, MA | 800-491-1073

With over 65 years of experience manufacturing all kinds of gears, Commercial Gear & Sprocket is the obvious choice for superior expertise and quality. OEMs from the construction, mining, medical, transportation, and defense industries have come to insist on our outstanding gear and sprocket products. Your custom requirements are no problem for our experienced staff. We manufacture bevel gears, helical gears, splines, sprockets, and much more! Visit our website or call us for more information!

The Adams Company

Dubuque, IA | 563-583-3591

Custom manufacturer of spur, helical, straight bevel, and worm gears. Gears feature pitches as coarse as 2.5 diametral, with ratios from 1:1 to 1:10 & maximum face widths up to 3.5 in. Gears are available with straight teeth with coniflex or conventional bearing.


Mineola, NY | 516-248-3850

KHK USA is a leading manufacturer and supplier of industrial gears. We have been manufacturing high quality industrial gears since 1935, so you can count on us for superior expertise, reliability, and performance. We manufacture all kinds of gears, including spur, helical, internal, miter, screw, worm, and bevel gears. Whether standard or custom, we can engineer a gear to meet your needs. Get in touch with us today to see what we can do for you!

Avion Technologies, Inc.

Mississauga, ON | 905-670-1570

Avion Technologies is your gear manufacturing specialist! We can manufacture a broad range of custom gears for virtually any application. With our versatile manufacturing capabilities, we can fabricate small, medium, and large diameter spur, helical, bevel, and worm gears along with rack and pinion sets and splines. We utilize advanced manufacturing technology and processes to deliver quality products quickly and to specifications! Call us to discuss your requirements and applications!

The simplest type of gear is the spur gear, or the “straight-cut gear.” Spur gears are straight-sided along the gear wheel’s axis with straight teeth radiating in alignment with the axis. Spur gears are often used as sprockets, which are thin gears with teeth that lock easily into roller chains. Sprockets act as a non-slip pulley for power transmission applications such as bicycle gears. Splines are cylinders or rods with straight teeth used to fit inside internal gears or devices to transmit motion laterally. Other types of spur gears fit with other parallel aligned gears, transmitting torque and motion laterally; these gears are a main component of planetary gears, or epicyclic gear trains. Planetary gears contain one central spur gear, or “sun gear” surrounded by three or more “planet gears;” the exterior gears interlock with the inward-facing teeth of a larger internal gear, increasing the output speed of the large outer gear through rotational torque applied to the internal sun gear. While spur gears are used in a wide range of simple and complex applications, planetary gears are used in complex automotive transmissions, drivetrains and other applications where complex gear ratios are required for smooth torque transmission.

Not all gears have straight, axis-aligned teeth. Worm gears’ teeth are arranged around a cylinder-shaped gear like a screw; spur or helical gears interlock with the screw-like worm gear so that the axes are perpendicular. The worm usually drives the gear, providing a high level of speed reduction for applications such as textile looms, packaging machinery, material handling and conveyor systems. Helical gears are refined spur gears with helically angled teeth; these angled teeth engage more fully than straight-toothed spur gears as well as providing far smoother, quieter functioning. Helical gears can also be aligned parallel or crossed, allowing gears to transmit torque perpendicularly for a broader number of applications. Conically shaped bevel gears allow gears to interlock at perpendicular angles for applications such as rear end wheel torque in cars. Bevel gears may have straight teeth, or they may be spiral bevel gears with curved teeth, similar to helical gears. Bevel gears are used as rear end gears in cars, trucks, other self-powered vehicles and industrial machinery requiring perpendicularly transmitted torque. Automotive differential gears are bevel gears arranged into epicyclic configurations, which allow various attached axles to turn at different speeds.

Gear manufacturers use gear cutting techniques such as gear hobbing to fabricate gears, designing their products to withstand harsh and repetitive use. A gear’s number of teeth and its specific gear ratio determine the function, speed and control the gear will have within a larger gear assembly. These factors will determine the gear’s durability and strength and also the speed it will be able to engage. Gears may be made from a variety of materials, including most metals and hard plastics. Highly wear-resistant plastics such as nylon and polycarbonate are useful in machinery applications where low weight is a requirement. In demanding applications such as automotive transmissions, gears are made from hard metals such as steel, brass, copper and even titanium. Heat, vibration and the presence of corrosive elements are all possible impediments to gear performance, which is why most gear systems use a form of lubrication. Operations that involve the use of gears are much more likely to be successful if gear composition and configuration are chosen with careful consideration for properties of strength, heat and corrosion resistance. Gears that are properly matched to their applications can be expected to perform reliably much longer than improperly applied gear equipment.

Omni Gear & Machine Corporation

Spur Gear ManufactuingIndustrial Gears – Omni Gear & Machine Corporation