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Zero-Backlash Jaw Couplings for Motors

Ruland zero-backlash jaw couplings have high dampening capabilities and can accommodate all forms of misalignment, making them well suited for applications with high acceleration and deceleration curves that couple a motor with a screw driven actuator or gearbox. Ruland jaw couplings are made up of two aluminum hubs and an elastomeric insert called the spider. They give motor manufacturers and integrators a standard coupling with a high level of customization. Hubs can be easily interchanged between clamp and set screw, with or without keyway and spiders have three durometers to choose from. This flexibility allows designers to specify an outer diameter with a variety of inch and metric bore sizes will match joined components such as lead screws, ball screws, and gearboxes.

Ruland hubs are manufactured with a proprietary curved jaw profile that ensures zero-backlash operation for fine positioning. Designers can select from three different spider durometers, enabling them to balance dampening, torque, and torsional rigidity based on the needs of their application. The spider serves as an inexpensive wear element that restores the coupling’s performance characteristics when replaced, saving maintenance costs when compared to couplings that must be entirely replaced. In the event of failure, the hub tenons will interlock for continued power transmission to allow the system to be shut down safely.

Zero-backlash jaw couplings are manufactured by Ruland with bores sizes ranging 1/8” to 1-1/4” and 3mm to 32mm.

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  1. Ruland JC21-10-A, Jaw Coupling Hub
    JC21-10-A
    As low as $27.18 $39.86
    Ruland JC21-10-A, 5/8" Jaw Coupling Hub, Aluminum, Clamp Style, 1.313" OD, 0.590" Length
  2. Ruland JC21-5-A, Jaw Coupling Hub
    JC21-5-A
    As low as $27.18 $39.86
    Ruland JC21-5-A, 5/16" Jaw Coupling Hub, Aluminum, Clamp Style, 1.313" OD, 0.590" Length
  3. Ruland JC21-6-A, Jaw Coupling Hub
    JC21-6-A
    As low as $27.18 $39.86
    Ruland JC21-6-A, 3/8" Jaw Coupling Hub, Aluminum, Clamp Style, 1.313" OD, 0.590" Length
  4. Ruland JC21-8-A, Jaw Coupling Hub
    JC21-8-A
    As low as $27.18 $39.86
    Ruland JC21-8-A, 1/2" Jaw Coupling Hub, Aluminum, Clamp Style, 1.313" OD, 0.590" Length
  5. Ruland JCC21-10-A, Jaw Coupling Hub
    JCC21-10-A
    As low as $34.06 $49.95
    Ruland JCC21-10-A, 5/8" Jaw Coupling Hub, Aluminum, Clamp Style With Keyway, 1.313" OD, 0.590" Length
  6. Ruland JCC21-6-A, Jaw Coupling Hub
    JCC21-6-A
    As low as $34.06 $49.95
    Ruland JCC21-6-A, 3/8" Jaw Coupling Hub, Aluminum, Clamp Style With Keyway, 1.313" OD, 0.590" Length
  7. Ruland JCC21-8-A, Jaw Coupling Hub
    JCC21-8-A
    As low as $34.06 $49.95
    Ruland JCC21-8-A, 1/2" Jaw Coupling Hub, Aluminum, Clamp Style With Keyway, 1.313" OD, 0.590" Length
  8. Ruland JS21-10-A, Jaw Coupling Hub
    JS21-10-A
    As low as $23.58 $34.58
    Ruland JS21-10-A, 5/8" Jaw Coupling Hub, Aluminum, Set Screw Style, 1.313" OD, 0.590" Length
  9. Ruland JS21-5-A, Jaw Coupling Hub
    JS21-5-A
    As low as $23.58 $34.58
    Ruland JS21-5-A, 5/16" Jaw Coupling Hub, Aluminum, Set Screw Style, 1.313" OD, 0.590" Length
  10. Ruland JS21-6-A, Jaw Coupling Hub
    JS21-6-A
    As low as $23.58 $34.58
    Ruland JS21-6-A, 3/8" Jaw Coupling Hub, Aluminum, Set Screw Style, 1.313" OD, 0.590" Length
  11. Ruland JS21-8-A, Jaw Coupling Hub
    JS21-8-A
    As low as $23.58 $34.58
    Ruland JS21-8-A, 1/2" Jaw Coupling Hub, Aluminum, Set Screw Style, 1.313" OD, 0.590" Length
  12. Ruland JSC21-10-A, Jaw Coupling Hub
    JSC21-10-A
    As low as $30.49 $44.72
    Ruland JSC21-10-A, 5/8" Jaw Coupling Hub, Aluminum, Set Screw Style With Keyway, 1.313" OD, 0.590" Length
  13. Ruland JSC21-6-A, Jaw Coupling Hub
    JSC21-6-A
    As low as $30.49 $44.72
    Ruland JSC21-6-A, 3/8" Jaw Coupling Hub, Aluminum, Set Screw Style With Keyway, 1.313" OD, 0.590" Length
  14. Ruland JSC21-8-A, Jaw Coupling Hub
    JSC21-8-A
    As low as $30.49 $44.72
    Ruland JSC21-8-A, 1/2" Jaw Coupling Hub, Aluminum, Set Screw Style With Keyway, 1.313" OD, 0.590" Length
  15. Ruland MJC33-10-A, Jaw Coupling Hub
    MJC33-10-A
    As low as $27.18 $39.86
    Ruland MJC33-10-A, 10mm Jaw Coupling Hub, Aluminum, Clamp Style, 33.3mm OD, 15.0mm Length
  16. Ruland MJC33-11-A, Jaw Coupling Hub
    MJC33-11-A
    As low as $27.18 $39.86
    Ruland MJC33-11-A, 11mm Jaw Coupling Hub, Aluminum, Clamp Style, 33.3mm OD, 15.0mm Length
  17. Ruland MJC33-12-A, Jaw Coupling Hub
    MJC33-12-A
    As low as $27.18 $39.86
    Ruland MJC33-12-A, 12mm Jaw Coupling Hub, Aluminum, Clamp Style, 33.3mm OD, 15.0mm Length
  18. Ruland MJC33-13-A, Jaw Coupling Hub
    MJC33-13-A
    As low as $27.18 $39.86
    Ruland MJC33-13-A, 13mm Jaw Coupling Hub, Aluminum, Clamp Style, 33.3mm OD, 15.0mm Length
  19. Ruland MJC33-14-A, Jaw Coupling Hub
    MJC33-14-A
    As low as $27.18 $39.86
    Ruland MJC33-14-A, 14mm Jaw Coupling Hub, Aluminum, Clamp Style, 33.3mm OD, 15.0mm Length
  20. Ruland MJC33-15-A, Jaw Coupling Hub
    MJC33-15-A
    As low as $27.18 $39.86
    Ruland MJC33-15-A, 15mm Jaw Coupling Hub, Aluminum, Clamp Style, 33.3mm OD, 15.0mm Length
  21. Ruland MJC33-16-A, Jaw Coupling Hub
    MJC33-16-A
    As low as $27.18 $39.86
    Ruland MJC33-16-A, 16mm Jaw Coupling Hub, Aluminum, Clamp Style, 33.3mm OD, 15.0mm Length
  22. Ruland MJC33-8-A, Jaw Coupling Hub
    MJC33-8-A
    As low as $27.18 $39.86
    Ruland MJC33-8-A, 8mm Jaw Coupling Hub, Aluminum, Clamp Style, 33.3mm OD, 15.0mm Length
  23. Ruland MJC33-9-A, Jaw Coupling Hub
    MJC33-9-A
    As low as $27.18 $39.86
    Ruland MJC33-9-A, 9mm Jaw Coupling Hub, Aluminum, Clamp Style, 33.3mm OD, 15.0mm Length
  24. Ruland MJCC33-10-A, Jaw Coupling Hub
    MJCC33-10-A
    As low as $34.06 $49.95
    Ruland MJCC33-10-A, 10mm Jaw Coupling Hub, Aluminum, Clamp Style With Keyway, 33.3mm OD, 15.0mm Length
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