Rigid Coupling

Rigid couplings are used to connect rotating members such as shafts. They are compact, economical components for the timing, joining or aligning of shafts and provide transmission of torque and motion. They are used at lower speeds, particularly where zero backlash is desired. These type of couplings do not allow for angular or parallel misalignment. Rigid couplings are also not intended for use as a critical part of a drive line or as a substitute for flexible or universal joints. They are also not meant for other power transmission devices. They are basically used for aligned shafts only. They are the most cost-effective coupling option suitable for all rigid shaft connections

The length of the coupling depends on the desired shaft gap between ends. For light applications, setscrews are used to attach the shafts to the coupling. This type of coupling do not accommodate for misalignment

Materials used in Rigid couplings

  • Brass
  • Aluminum
  • Cast Iron
  • Stainless Steel
  • Carbon Steel etc.

Features of Rigid couplings:

  • Rated torque:

    The maximum service torque for which the product is rated.
  • Rated speed:

    This is the maximum rated rotational speed of the rigid coupling.
  • Stiffness:

    This is expressed in degrees (torque per units of angular deformation).
  • Backlash:

    Due to a change, the rotational position loss is measured in degrees.
  • Honing:

    This corrects any residual distortions caused by stresses occurred during the manufacturing process, resulting in a round, precisely sized bore.
  • Important dimensions

    • Bore diameter:

      Internal diameter (ID) for mating to the shaft-end.
    • Coupling diameter:

      Outside diameter (OD), which includes the housing.
    • Design units:

      are in inches (in) or metric measurements such as centimeters (cm).
    • Keyway width:

      This is an additional consideration for rigid couplings with one or more keyways.

Benefits of rigid coupling:

  • They are economical.
  • They have high torque capacity
  • They have torsional stiffness.
  • They have zero-backlash.
Base Frame

We design, manufacture, supply & commission for frame to meet the design requirement.

All design loads motor generator max reaction force, dead load, transportation and handling load etc are considered for design.

We have proven skill and facility to manufacture small to large size base frame meeting the design requirement.

Our Expertise

Laser Alignment:

We have facility to do onsite alignment of equipment to be coupled , laser alignment tool as well as manual dial gauge alignment tool are available. We reconfirm the correctness of alignment by vibration analysis method.

Alignment Report:

Vibration Report:

Locking Device

      This friction type locking device allows easy, strong, and secure connections between shafts and hubs without backlash.

      Locking devices are unique keyless, frictional shaft-hub locking devices which provide an easily-adjustable and releasable shrink fit. Advantages: Elimination of keys and keyways on both shafts and hubs No backlash - completely tight fit around the shaft Unaffected by reversing, dynamic or shock loads. Easy assembly and disassembly. Ease of axial and angular adjustment or timing.


      With this design the Safeset pressure ring plays no active role in the torque transmission. The ring merely exerts a static radial force onto a torque transmitting connection sleeve, pressing this against the shaft or shaft sleeve. Thereby higher dynamic bending moments and radial forces can be transmitted by the Safeset.

Shear Pin

     This is a age-old cost effective method of limit the maximum of transfer & protecting the gear train.

     The material of transmission and geometry of pin is designed that the failure is only for over load torque and not due to fatigue.