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This section provides an overview for helical gears as well as their applications and principles. Also, please take a look at the list of 10 helical gear manufacturers and their company rankings. Here are the top-ranked helical gear companies as of May, 2025: 1.Power Transmission Group, 2.Toronto Gear Works, 3.Stock Drive Products Sterling Instrument.
Table of Contents
A gear is a toothed wheel designed to transmit torque through meshing with other gears. Helical gears, a common type of gear, have teeth cut at an angle, forming a helix.
Unlike spur gears that only transmit power with parallel axes, helical gears can also operate with intersecting axes. Their teeth are arranged diagonally, allowing for smoother meshing and continuous contact between teeth. This design reduces noise and vibration during operation but makes the manufacturing process more complex.
Helical gears are widely used in several industries due to their efficiency and smooth operation:
In automobile gearboxes, helical gears transmit power from the engine to the wheels. They facilitate different gear ratios for various speed ranges, contributing to smooth gear changes and quiet operation.
These gears are integral to many industrial machines, driving conveyor belts, and axis drives in CNC machines, ensuring precision and reliability.
Helical gears in aircraft transmit power in engine mechanisms and control systems, ensuring efficient motion transfer to propellers or fans and reliable operation in control systems.
Used in generators and turbines, helical gears transfer high-speed rotational power, playing a crucial role in effective power generation.
Helical gears work by meshing teeth cut in a helical pattern, providing a high meshing ratio for smooth and continuous engagement. The progressive contact of the teeth distributes force evenly, reducing sudden stress and ensuring smoother power transmission.
The helical design creates thrust forces during rotation, necessitating robust bearings to withstand these forces. Angular contact bearings are common, but thrust bearings may be used for heavy loads.
The helix of helical gears can be either right-handed or left-handed. The selection depends on the alignment of the input and output shafts. For parallel shafts, gears with the same helix direction are used, while intersecting or helically aligned shafts require opposite helix directions.
The helical angle, representing the axial advance per revolution, is crucial. A larger helical angle results in smoother gear meshing and quieter operation. Careful consideration of the rotation direction and helical angle is essential to ensure efficient power transmission and gear longevity.
*Including some distributors, etc.
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Power Transmission Group, founded in Punxsutawney, Pennsylvania, is a manufacturer specializing in custom gears and gearbox repair. The company’s portfolio includes bevel gears, internal spline gears, bevel sprockets, segment gears, worm gear sets, and more. The company also utilizes CMM and SolidWorks 3D modeling software to reverse engineer old gears or design new custom ones. These products find applications in diverse sectors including oil, pneumatics, pulp and paper, machinery, and other industries. The company offers 24-hour emergency breakdown rush service and maintains a comprehensive inventory of materials including 4140 Steel, 8620 Steel, Cast Iron Class 40, and more.
Riley Gear Corporation is a manufacturer of precision and custom gearboxes established in 1946 and located in Buffalo, New York, USA. The company offers high-speed gears for applications requiring rapid gear operation, large-size gears for heavy-duty applications in the industrial sector, and precision gears for withstanding wear in demanding environments. It also offers its custom manufacturing capabilities for unique projects. The company chiefly serves clients in the defense, energy, and transportation industries.
Arrow Gear Co., founded in 1947 and headquartered in Downers Grove, Illinois, is a manufacturer of high-precision gears catering to aerospace and commercial industries. Its specialization lies in spiral bevel gears, and it also offers a comprehensive range of gearing solutions, including bevel gears, spur gears, helical gears, curvic couplings, and complete gearboxes. These products find applications across various machinery and equipment, facilitating power and motion transfer. The company holds several certifications in quality standards such as ISO 9001:2015, AS9100 REV D, and Nadcap for Heat Treating and Non-Destructive Testing.
SDP/SI, founded in 1950 and headquartered in New York, USA, is a manufacturer of mechanical components. The company provides mechanical components, engineering and manufacturing services for industrial and commercial applications. Its product portfolio consists of over 80,000 products, such as precision gears, bearings and couplings in various metals and alloys. It also provides custom solutions for motion control and small power transmission. The company is compliant with the RoHS and REACH standard, and has obtained AS9100D quality management certification.
Kohara Gear Industry Co., Ltd. (KHK), established in 1935, is a Japanese manufacturer headquartered in Kawaguchi, Saitama, specializing in the production of stock gears. The company’s product portfolio includes bevel, helical, internal, miter, and plastic gears. Additionally, it offers other types of stock gears such as screw, spur, and worm gears. The company also provides standard and circular pitch (CP) gear racks, gear couplings, as well as pre-lubricated bevel gear boxes designed to be freely mountable in any direction. Furthermore, the company offers customization options, allowing customers to choose specific gear tooth pitches, sizes, grades, and materials, such as metal and plastic.
Miller Plastic Products, Inc., founded in 1969 with headquarters in the USA, is a custom manufacturer of plastic tanks and components. The company's products include acid process tanks, kynar pipes and pipe fittings, dip pipes, headers, and manifolds. Miller Plastic Products, Inc. has expanded its product line to include PPE and other occupational health and safety accessories. The company also offers custom CNC machining, annealing services, custom plastic fabrication for plastic lab equipment, wet benches, sinks, counter tops, and cabinet systems.
W M Berg, founded in 1967 and based in Cudahy, Wisconsin, is a manufacturer and supplier of precision industrial parts. The company delivers ISO 9001:2015 certified products and services, including assemblies, bearings, belts & chains, couplings & shafts, gears, fasteners & hardware, pulleys & sprockets and more. W M Berg provides designing, developing, manufacturing and testing facilities to its clients in the aerospace, medical and motion control industries. Its distributors include Applied Industrial Technology and Motion Industries.
Ranking as of May 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Power Transmission Group |
20.0%
|
| 2 | Toronto Gear Works |
16.0%
|
| 3 | Stock Drive Products Sterling Instrument |
12.0%
|
| 4 | W.M. Berg |
12.0%
|
| 5 | Riley Gear Corp. |
8.0%
|
| 6 | Moore Gear & Manufacturing Co. |
8.0%
|
| 7 | Arrow Gear Co. |
8.0%
|
| 8 | KHK |
8.0%
|
| 9 | Federal Gear and Machine. |
4.0%
|
| 10 | Miller Plastic Products, Inc. |
4.0%
|
Derivation Method
The ranking is calculated based on the click share within the helical gear page as of May 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
6 | 75.0% |
|
Japan
|
1 | 12.5% |
|
Canada
|
1 | 12.5% |
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