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Locking Assembly Manufacturers

A locking assembly is a keyless mechanical device that creates a strong, friction-based connection between a shaft and a hub (like gears, pulleys, or flywheels) by using conical rings that expand to generate a powerful, backlash-free compression fit, allowing reliable torque transmission and preventing stress concentration issues common with keyways. 

How It Works

Components: It typically consists of a hollow shaft, a hub, and one or two pressure rings (often double-tapered).

Installation: The assembly is placed between the shaft and the hub.

Clamping: Screws are tightened, pulling the conical rings together, which forces them to expand radially.

Friction Lock: This radial expansion creates a uniform 360-degree clamping force, generating a strong frictional fit (shrink fit) between the shaft and the hub. 

Key Advantages

No Keyways: Eliminates stress points and wear associated with traditional keyways, preventing fretting and corrosion.

High Torque Capacity: Can transmit higher torques and bending moments than keyed connections, often allowing for smaller, thinner shafts.

Precision: Offers highly concentric and precise positioning of components.

Versatility: Available in self-centering or non-self-centering types, with or without axial displacement. 

Common Applications

Used for mounting components like:

Gears, sprockets, chain wheels

Pulleys, belt drums

Brake discs, flywheels, cams, and levers 

In essence, it's a superior, keyless alternative for robust shaft-hub connections, ideal for demanding industrial applications. 

About Rokang
Jiangsu Rokang Heavy Industry Technology Co., Ltd.
Jiangsu Rokang Heavy Industry Technology Co., Ltd. has fixed assets of more than 80 million yuan, and has a team of professional talents in mechanical design, precision manufacturing, heat treatment, welding, etc.; the company has a one-stop complete set of processing facilities and a series of quality inspection systems such as measurement, physical and chemical, and dynamic testing, and has a comprehensive mechanical processing capability. Locking Assembly Manufacturers and Locking Assembly Factory in China. For many years, the company has been committed to the research and development and manufacturing of ball cage type constant velocity universal couplings, cross shaft type universal couplings, and drum gear couplings. It has carried out close industry-university-research cooperation with military and local scientific research institutes and Power Engineering Department of PLA Naval Academy, and has continuously expanded into the fields of precision, heavy load and high speed. The products have successfully replaced foreign famous brand products with excellent performance, and the process technology has reached the international advanced level. It has been widely used in lifting and transportation, metallurgical machinery, metal rolling, engineering machinery, mining machinery, petrochemical, textile machinery, military ships, armored vehicles, railway locomotives, special vehicles and other fields. The product quality and service have been recognized and praised by the majority of users, and are exported to Europe, America, Russia, the Middle East, India and other countries and regions. In recent years, the company has been committed to the in-depth research and development of ball cage constant velocity universal couplings, and has successively developed ball cage constant velocity universal couplings for screw pumps, ball spline ball cage constant velocity universal couplings, coaxial double-speed, and double-way ball cage constant velocity universal couplings. Custom Locking Assembly. It fundamentally solves the new problems that users currently encounter during use. The company has always adhered to the business purpose of "quality first, honest management, and customer first". We are willing to work with you with excellent products, preferential prices and thoughtful services to create a brilliant career!

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Industry knowledge

What Is a Locking Assembly and Why It Matters in Shaft-Hub Connections

A locking assembly is a keyless mechanical fastening device used to create a high-strength, friction-based connection between a shaft and a hub. Unlike traditional keyed connections, it relies on tapered rings and axial clamping force to generate uniform radial pressure, enabling reliable torque transmission without backlash. This makes locking assemblies especially suitable for applications requiring high precision, heavy loads, and long service life.

Working Principle of a Locking Assembly

A locking assembly typically consists of inner and outer conical rings and a set of high-strength screws. When the screws are tightened, the tapered rings are drawn together axially. This movement converts axial force into radial expansion and contraction, producing a uniform 360-degree clamping force between the shaft and hub surfaces.

The resulting frictional connection functions similarly to a shrink fit but without thermal processing. Torque and axial loads are transmitted purely through friction, which significantly reduces stress concentration and improves fatigue resistance.

Practical Advantages Over Keyed Connections

  • Eliminates keyways, reducing stress concentration, fretting, and corrosion on shafts and hubs.
  • Higher torque transmission capacity compared to conventional keyed joints of the same size.
  • Excellent concentricity and repeatable positioning, suitable for high-speed and precision machinery.
  • Easy installation and removal without damaging mating components.

Typical Industrial Applications of Locking Assemblies

Locking assemblies are widely used across industries where reliable shaft-hub connections are critical. Common applications include gear mounting, pulley and sprocket fixation, flywheels, brake discs, and drum systems operating under variable loads.

Industry Typical Equipment
Metallurgy Rolling mills, gear drives
Mining Conveyors, crushers
Engineering Machinery Winches, transmission shafts

Manufacturing Capability Behind Reliable Locking Assemblies

The performance of a locking assembly depends heavily on precision machining, material selection, heat treatment, and quality control. Manufacturers with integrated processing and testing capabilities are better positioned to ensure stable friction coefficients, consistent tolerances, and long-term operational reliability.

Locking Assembly Production and Technical Strength

Jiangsu Rokang Heavy Industry Technology Co., Ltd. is a professional locking assembly manufacturer and factory in China with fixed assets exceeding 80 million yuan. The company is supported by a technical team specializing in mechanical design, precision machining, heat treatment, and welding, enabling comprehensive control over the entire production process.

With complete machining facilities and advanced inspection systems covering dimensional measurement, physical and chemical testing, and dynamic performance verification, the company ensures each locking assembly meets demanding industrial requirements.

Application Experience and Industry Recognition

Through long-term cooperation with military and civilian research institutions, the company has continuously expanded into high-precision, heavy-load, and high-speed application fields. Its products are widely used in lifting and conveying equipment, metallurgical machinery, mining machinery, petrochemical systems, textile machinery, railway locomotives, special vehicles, and military equipment.

With proven performance, Rokang’s products have successfully replaced imported brands in many applications and are exported to Europe, the Americas, Russia, the Middle East, and India, earning strong customer recognition for quality and service.

Conclusion: Choosing the Right Locking Assembly Solution

A locking assembly is a practical and reliable solution for modern shaft-hub connections, especially in demanding industrial environments. When combined with strong manufacturing capability, rigorous quality control, and real-world application experience, it delivers long-term performance, safety, and cost efficiency for end users.