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This section provides an overview for power locks as well as their applications and principles. Also, please take a look at the list of 6 power lock manufacturers and their company rankings. Here are the top-ranked power lock companies as of March, 2026: 1.HANGZHOU CHINABASE MACHINERY CO., LTD., 2.MIKI PULLEY CO., LTD..
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Categories Related to Power Locks
A Power Lock is a friction-type fastener mainly used to fasten a shaft and a boss.
Power Lock uses the wedge principle to obtain frictional force and is characterized by its ability to fasten two parts with non-backlash by simply tightening the bolt. Backlash refers to the play caused by the meshing of gears, while non-backlash refers to the absence of play in the gears.
Power Lock is used to fasten mechanical elements such as rotating shafts, pulleys, and gears in various industrial machines. They are also used in semiconductor manufacturing devices and food processing machines. The characteristics of wear-type fastening devices are mainly used in fields such as conveying, packaging, and printing machinery.
In these applications, the phase level can be adjusted with only one bolt, for example, for final positioning of powertrain components such as pulleys and sprockets. In addition, the design requires less space because the adjustment can be made from the side of the rotating parts. We also offer an environmentally resistant series to meet the needs of clean rooms.
The outer ring and inner ring, which are in contact with each other on the tapered surface, are spread over the inner and outer diameters by the fastening bolt, creating a frictional force between the shaft parts and housing parts.
Some hydro-hydraulic systems are based on Pascal's principle. In the hydro-hydraulic system, a screw pressurizes and compresses the pressure medium sealed inside the sleeve to generate a frictional force between the shaft parts and housing parts.
Frictional fasteners using wedges, such as Power Lock, are characterized by their low cost and versatility. On the other hand, they require time and labor for installation and dismounting.
Hydro-hydraulic systems are slightly more expensive than wedge mechanical systems, but they are very easy to maintain, and their ease of installation and removal, as well as their speed and precision, are also advantages of hydro-hydraulic systems. The wedge-mechanical system is relatively compact but can handle high torques.
However, because of the large number of screws used, removal takes a lot of time, and care must be taken not to forget to tighten the screws. In contrast, the hydro-hydraulic system is easier to install and remove, more accurate, and superior to the mechanical system if cost is not a factor.
Power Lock transmits torque by friction with the shaft. To achieve the specified transmission torque, the tightening torque of the tightening bolt and the dimensional tolerance of the shaft must be controlled.
The tightening torque for bolts is listed in the manufacturer's technical data and ranges from 11.1 to 18.4 Nm for a shaft diameter of 20 mm, which varies from model to model. The transmission torque at this time is 61.7 to 62.7 Nm. The recommended tolerance of the shaft dimensions is h6 for φ38 or smaller and h8 for φ40 or larger, and if the dimensions are too small, the transmission torque will be reduced. Conversely, if the dimension is too large, mounting will not be possible.
Tighten the bolts diagonally and gradually to ensure uniform tightening. Finally, set the torque wrench to the specified torque and tighten all bolts. This prevents over-tightening.
Although multiple Power Locks can be installed on a single shaft, it should be noted that the transmitted torque is not simply proportional to the quantity. According to the manufacturer's data, the torque is 1.55 times higher with two locks and 1.85 times higher with three locks.
When removing Power Lock, loosen the pressurizing bolt to release the tightening by the wedge. However, some power locks that have been tightened for a long period of time may be stuck and cannot be simply removed by loosening the bolts. In this case, screw the bolt into the extraction tap next to the pressurized bolt hole and forcibly pull off the fastener.
It must also be ensured that no load or torque is applied to the Power Lock during removal. If the Power Lock pops out or rotates during removal, it may cause a serious accident.
*Including some distributors, etc.
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ATR Inc., founded in 1980 in Houston, Texas, USA, is a manufacturer of advanced flexible shaft couplings for the power transmission industry. The company offers a diverse range of product varieties, including metal bellows couplings, elastomeric couplings, and disc couplings. These couplings provide benefits such as torque transmission, misalignment compensation, and vibration damping, ensuring smooth and optimal mechanical operations. These flexible shaft couplings find applications in various industries, including automation, robotics, aerospace, and manufacturing. With an emphasis on precision engineering, it offers multiple unique coupling solutions that enhance the performance and efficiency of machinery and equipment across different sectors.
Hangzhou Chinabase Machinery Co., Ltd., founded in 1992 and based in Hangzhou, China, is a manufacturer specializing in an array of products, including power transmission components. Its key products encompass chains and sprockets for industrial power transmission, gearboxes to enhance torque and reduce speed, couplings for shaft connections, and gears used across industrial applications. Its products find applications in automation, conveyor technology, packaging, food, pharmaceuticals, and more. The company maintains quality and sustainability, holding certifications like ISO 9002, ISO 9001, API, ISO/TS 16949:2002, and ISO 10012 measurement management system.
Miki Pulley Co., Ltd., founded in 1939, is a manufacturer and provider of solutions for power transmission and control problems, headquartered in Kawasaki City, Japan. They manufacture various products essential for all industries, including couplings for high-precision power transmission, electromagnetic clutches and brakes for power transmission when energized, and speed changers and reducers for controlling the speed of machinery. They also offer inverters, linear shaft drives, rotation speed indicators, torque limiters, and ROSTA rubber springs.
Chien Hsiang Transmission Industry Co. Ltd., founded in 1981 and based in Taoyuan City, Taiwan, is a manufacturer of transmission products such as gears, conveyor chains, and couplings. The company also produces roller chains, toothed pulleys, and conveyor sprockets. Its products are used in various industries, including pharmaceutical, agriculture, and electronics. Some major Taiwanese customers that use its products for transmission systems include Fair Friend Group, Kenmec Mechanical Engineering, and DragonSteel. The company has subsidiaries in China, including HuangShan Jia, Jianxiang Transmission Industries Co. Ltd., and Ji-Jia Transmission Machinery Co. Ltd.
Ranking as of March 2026
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | HANGZHOU CHINABASE MACHINERY CO., LTD. |
44.4%
|
| 2 | ATR Inc. |
22.2%
|
| 3 | MIKI PULLEY CO., LTD. |
22.2%
|
| 4 | Chien Hsiang Transmission industry Co., LTD |
11.1%
|
Derivation Method
The ranking is calculated based on the click share within the power lock page as of March 2026. 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 (%) |
|---|---|---|
|
Japan
|
4 | 66.7% |
|
United States of America
|
1 | 16.7% |
|
China
|
1 | 16.7% |
67 products found
67 products
Seiichi Kiko Co., Ltd.
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■Structure and materials ・Main body (Material: AL-7075-T6/Surface treatment: Anodizing) ・Fastening bolt (Material: SCM435/Surface treatment: Elec...
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■Structure and materials <SAPL-C> ・Body (Material: Steel) ・Fastening bolt (Material: SCM435/Surface treatment: Black oxide film) <SAPL-CK> ・Mai...
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■Structure and materials <SAPL-A> ・Body (Material: Steel) ・Fastening bolt (Material: SCM435/Surface treatment: Black oxide film) <SAPL-AK> ・Mai...
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MIKI PULLEY CO., LTD.
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■Structure and materials Main body (material: steel) ■Features ・Relatively low fastening torque ・High cost performance, used when there are spac...
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■Structure and materials ・Body (Material: Steel) ・Fastening bolt (Material: SCM435/Surface treatment: Black oxide film) ■Features ・Design suita...
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■Structure and materials ・Body (Material: Steel) ・Fastening bolt (Material: SCM435/Surface treatment: Black oxide film) ■Features ・Very high to...
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■What is a friction fastener? Friction fasteners are mechanical elements used to connect the rotating shafts of various industrial machines to pull...
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Seiichi Kiko Co., Ltd.
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■Structure and materials ・Body (Material: Steel) ・Fastening bolt (Material: SCM435/Surface treatment: Black oxide film) ■Features ・The inner an...
MIKI PULLEY CO., LTD.
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■Applications In addition to the applications of SCE201FH, it is especially suitable for timing pulleys, sprockets, etc. with small boss outer diam...
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■Applications Ideal for cases where the boss wall thickness cannot be secured or for fastening hollow shafts.
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■Applications Clamp shafts, pumps, cams, gear parts, brake discs, sprocket wheels, etc.
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■Structure and materials ・Body (Material: Steel) ・Fastening bolt (Material: SCM435/Surface treatment: Black oxide film) ■Features ・The most com...
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■Applications In addition to the applications of the SCE200 type, it is especially suitable for timing pulleys with short boss widths.
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■Applications In addition to the applications of the SCE200 type, it is especially suitable for timing pulleys with short boss widths.
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