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Bellows Couplings for Test, Measurement, and Inspection Applications

Ruland bellows couplings are made of two lightweight anodized aluminum hubs joined by a flexible stainless steel bellows. The thin walls of the bellows allow the coupling to flex under misalignment while remaining rigid under torsional loads. Engineers designing precision test, measurement, or inspection systems often choose bellows couplings because they are lightweight, accommodate all forms of misalignment, and have the greatest size-for-size torque and torsional stiffness of any Ruland flexible coupling.
Ruland bellows couplings are manufactured with a low inertia and zero-backlash making them a good choice for high torque applications that cannot support a rigid coupling due to weight or misalignment requirements. They have a balanced design for reduced vibration at speeds up to 10,000 RPM. Bellows couplings are available in clamp and set screw hubs with or without keyways in bore sizes ranging from 1/8” to 1” and 3mm to 25mm. They are manufactured in our Marlborough, MA factory under strict controls using proprietary processes.

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  1. Ruland BCK16-1/2"-10MM-A, Bellows Coupling
    BCK16-1/2"-10MM-A
    As low as $104.27 $152.92
    Ruland BCK16-1/2"-10MM-A, 1/2" x 10mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  2. Ruland BCK16-1/2"-11MM-A, Bellows Coupling
    BCK16-1/2"-11MM-A
    As low as $104.27 $152.92
    Ruland BCK16-1/2"-11MM-A, 1/2" x 11mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  3. Ruland BCK16-1/2"-12MM-A, Bellows Coupling
    BCK16-1/2"-12MM-A
    As low as $104.27 $152.92
    Ruland BCK16-1/2"-12MM-A, 1/2" x 12mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  4. Ruland BCK16-1/2"-6MM-A, Bellows Coupling
    BCK16-1/2"-6MM-A
    As low as $104.27 $152.92
    Ruland BCK16-1/2"-6MM-A, 1/2" x 6mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  5. Ruland BCK16-1/2"-7MM-A, Bellows Coupling
    BCK16-1/2"-7MM-A
    As low as $104.27 $152.92
    Ruland BCK16-1/2"-7MM-A, 1/2" x 7mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  6. Ruland BCK16-1/2"-8MM-A, Bellows Coupling
    BCK16-1/2"-8MM-A
    As low as $104.27 $152.92
    Ruland BCK16-1/2"-8MM-A, 1/2" x 8mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  7. Ruland BCK16-1/2"-9MM-A, Bellows Coupling
    BCK16-1/2"-9MM-A
    As low as $104.27 $152.92
    Ruland BCK16-1/2"-9MM-A, 1/2" x 9mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  8. Ruland BCK16-10MM-1/4"-A, Bellows Coupling
    BCK16-10MM-1/4"-A
    As low as $104.27 $152.92
    Ruland BCK16-10MM-1/4"-A, 10mm x 1/4" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  9. Ruland BCK16-10MM-3/8"-A, Bellows Coupling
    BCK16-10MM-3/8"-A
    As low as $104.27 $152.92
    Ruland BCK16-10MM-3/8"-A, 10mm x 3/8" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  10. Ruland BCK16-10MM-5/16"-A, Bellows Coupling
    BCK16-10MM-5/16"-A
    As low as $104.27 $152.92
    Ruland BCK16-10MM-5/16"-A, 10mm x 5/16" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  11. Ruland BCK16-11MM-1/4"-A, Bellows Coupling
    BCK16-11MM-1/4"-A
    As low as $104.27 $152.92
    Ruland BCK16-11MM-1/4"-A, 11mm x 1/4" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  12. Ruland BCK16-11MM-3/8"-A, Bellows Coupling
    BCK16-11MM-3/8"-A
    As low as $104.27 $152.92
    Ruland BCK16-11MM-3/8"-A, 11mm x 3/8" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  13. Ruland BCK16-11MM-5/16"-A, Bellows Coupling
    BCK16-11MM-5/16"-A
    As low as $104.27 $152.92
    Ruland BCK16-11MM-5/16"-A, 11mm x 5/16" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  14. Ruland BCK16-12MM-1/4"-A, Bellows Coupling
    BCK16-12MM-1/4"-A
    As low as $104.27 $152.92
    Ruland BCK16-12MM-1/4"-A, 12mm x 1/4" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  15. Ruland BCK16-12MM-3/8"-A, Bellows Coupling
    BCK16-12MM-3/8"-A
    As low as $104.27 $152.92
    Ruland BCK16-12MM-3/8"-A, 12mm x 3/8" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  16. Ruland BCK16-12MM-5/16"-A, Bellows Coupling
    BCK16-12MM-5/16"-A
    As low as $104.27 $152.92
    Ruland BCK16-12MM-5/16"-A, 12mm x 5/16" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  17. Ruland BCK16-3/8"-6MM-A, Bellows Coupling
    BCK16-3/8"-6MM-A
    As low as $104.27 $152.92
    Ruland BCK16-3/8"-6MM-A, 3/8" x 6mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  18. Ruland BCK16-3/8"-7MM-A, Bellows Coupling
    BCK16-3/8"-7MM-A
    As low as $104.27 $152.92
    Ruland BCK16-3/8"-7MM-A, 3/8" x 7mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  19. Ruland BCK16-3/8"-8MM-A, Bellows Coupling
    BCK16-3/8"-8MM-A
    As low as $104.27 $152.92
    Ruland BCK16-3/8"-8MM-A, 3/8" x 8mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  20. Ruland BCK16-3/8"-9MM-A, Bellows Coupling
    BCK16-3/8"-9MM-A
    As low as $104.27 $152.92
    Ruland BCK16-3/8"-9MM-A, 3/8" x 9mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  21. Ruland BCK16-6-4-A, Bellows Coupling
    BCK16-6-4-A
    As low as $104.27 $152.92
    Ruland BCK16-6-4-A, 3/8" x 1/4" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000", OD 1.345" Length
  22. Ruland BCK16-6-5-A, Bellows Coupling
    BCK16-6-5-A
    As low as $104.27 $152.92
    Ruland BCK16-6-5-A, 3/8" x 5/16" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000", OD 1.345" Length
  23. Ruland BCK16-6-6-A, Bellows Coupling
    BCK16-6-6-A
    As low as $104.27 $152.92
    Ruland BCK16-6-6-A, 3/8" x 3/8" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000", OD 1.345" Length
  24. Ruland BCK16-8-4-A, Bellows Coupling
    BCK16-8-4-A
    As low as $104.27 $152.92
    Ruland BCK16-8-4-A, 1/2" x 1/4" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000", OD 1.345" Length
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