Product Description

A rigid union coupling, also known simply as a rigid coupling, is a mechanical device designed to connect two shafts in a rotating system, providing a solid and inflexible link between them. Unlike flexible couplings that allow for some degree of misalignment and torsional flexibility, rigid couplings maintain strict alignment between shafts, ensuring efficient power transmission with minimal loss.

They consist of two cylindrical hubs with precision-machined bores, connected by a solid center section. This design ensures concentricity between shafts and eliminates angular misalignment, thereby reducing vibration, noise, and wear in the system.


1. Precise Alignment: Rigid couplings maintain strict alignment between shafts, minimizing shaft deflection and angular misalignment.
2. High Torque Transmission: Rigid couplings are capable of transmitting high levels of torque without introducing torsional flexibility or backlash.
3. Minimal Maintenance: Due to their simple and robust design, rigid union couplings require minimal maintenance compared to flexible couplings.
4. Compact and Lightweight: Rigid couplings have a compact and lightweight construction, making them suitable for installations with space constraints or weight limitations.


  • Machine Tools: In precision machining applications such as lathes, mills, and grinders, rigid couplings connect the motor or drive shaft to the tool spindle, ensuring accurate rotation and cutting performance.
  • Pumping Systems: Rigid couplings are commonly used in centrifugal pumps, positive displacement pumps, and other fluid handling equipment to connect the pump shaft to the motor or drive assembly. Their precise alignment capabilities help maintain pump efficiency and reliability.
  • Conveyor Systems: In material handling applications, rigid union couplings connect shafts in conveyor belts, rollers, and pulleys, ensuring smooth and reliable operation of the conveyor system.
  • Industrial Gearboxes: Rigid couplings play a crucial role in connecting input and output shafts in gearboxes, reducers, and transmission systems, facilitating efficient power transmission and torque multiplication.

Please click, If you consider more detailed parameters

Rigid Union Coupling

Leave Your Message