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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 BC16-1/2"-12MM-A, Bellows Coupling
    BC16-1/2"-12MM-A
    As low as $87.82 $128.81
    Ruland BC16-1/2"-12MM-A, 1/2" x 12mm Bellows Coupling, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
  2. Ruland BC21-1/2"-12MM-A, Bellows Coupling
    BC21-1/2"-12MM-A
    As low as $94.83 $139.09
    Ruland BC21-1/2"-12MM-A, 1/2" x 12mm Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
  3. Ruland BC21-5/8"-12MM-A, Bellows Coupling
    BC21-5/8"-12MM-A
    As low as $94.83 $139.09
    Ruland BC21-5/8"-12MM-A, 5/8" x 12mm Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
  4. Ruland BC26-1/2"-12MM-A, Bellows Coupling
    BC26-1/2"-12MM-A
    As low as $105.39 $154.57
    Ruland BC26-1/2"-12MM-A, 1/2" x 12mm Bellows Coupling, High Stiffness, Aluminum, 1.625" (41.3mm), OD 2.035" (51.7mm) Length
  5. Ruland BC26-3/4"-12MM-A, Bellows Coupling
    BC26-3/4"-12MM-A
    As low as $105.39 $154.57
    Ruland BC26-3/4"-12MM-A, 3/4" x 12mm Bellows Coupling, High Stiffness, Aluminum, 1.625" (41.3mm), OD 2.035" (51.7mm) Length
  6. Ruland BC26-5/8"-12MM-A, Bellows Coupling
    BC26-5/8"-12MM-A
    As low as $105.39 $154.57
    Ruland BC26-5/8"-12MM-A, 5/8" x 12mm Bellows Coupling, High Stiffness, Aluminum, 1.625" (41.3mm), OD 2.035" (51.7mm) Length
  7. Ruland BC32-1"-12MM-A, Bellows Coupling
    BC32-1"-12MM-A
    As low as $126.47 $185.49
    Ruland BC32-1"-12MM-A, 1" x 12mm Bellows Coupling, High Stiffness, Aluminum, 2.000" (50.8mm), OD 2.413" (61.3mm) Length
  8. Ruland BC32-1/2"-12MM-A, Bellows Coupling
    BC32-1/2"-12MM-A
    As low as $126.47 $185.49
    Ruland BC32-1/2"-12MM-A, 1/2" x 12mm Bellows Coupling, High Stiffness, Aluminum, 2.000" (50.8mm), OD 2.413" (61.3mm) Length
  9. Ruland BC32-3/4"-12MM-A, Bellows Coupling
    BC32-3/4"-12MM-A
    As low as $126.47 $185.49
    Ruland BC32-3/4"-12MM-A, 3/4" x 12mm Bellows Coupling, High Stiffness, Aluminum, 2.000" (50.8mm), OD 2.413" (61.3mm) Length
  10. Ruland BC32-5/8"-12MM-A, Bellows Coupling
    BC32-5/8"-12MM-A
    As low as $126.47 $185.49
    Ruland BC32-5/8"-12MM-A, 5/8" x 12mm Bellows Coupling, High Stiffness, Aluminum, 2.000" (50.8mm), OD 2.413" (61.3mm) Length
  11. Ruland BC32-7/8"-12MM-A, Bellows Coupling
    BC32-7/8"-12MM-A
    As low as $126.47 $185.49
    Ruland BC32-7/8"-12MM-A, 7/8" x 12mm Bellows Coupling, High Stiffness, Aluminum, 2.000" (50.8mm), OD 2.413" (61.3mm) Length
  12. 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
  13. Ruland BCK21-1/2"-12MM-A, Bellows Coupling
    BCK21-1/2"-12MM-A
    As low as $113.14 $165.94
    Ruland BCK21-1/2"-12MM-A, 1/2" x 12mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
  14. Ruland BCK21-5/8"-12MM-A, Bellows Coupling
    BCK21-5/8"-12MM-A
    As low as $113.14 $165.94
    Ruland BCK21-5/8"-12MM-A, 5/8" x 12mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
  15. Ruland BCK26-1/2"-12MM-A, Bellows Coupling
    BCK26-1/2"-12MM-A
    As low as $135.16 $198.24
    Ruland BCK26-1/2"-12MM-A, 1/2" x 12mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.625" (41.3mm), OD 2.035" (51.7mm) Length
  16. Ruland BCK26-3/4"-12MM-A, Bellows Coupling
    BCK26-3/4"-12MM-A
    As low as $135.16 $198.24
    Ruland BCK26-3/4"-12MM-A, 3/4" x 12mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.625" (41.3mm), OD 2.035" (51.7mm) Length
  17. Ruland BCK26-5/8"-12MM-A, Bellows Coupling
    BCK26-5/8"-12MM-A
    As low as $135.16 $198.24
    Ruland BCK26-5/8"-12MM-A, 5/8" x 12mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.625" (41.3mm), OD 2.035" (51.7mm) Length
  18. Ruland BCK32-1"-12MM-A, Bellows Coupling
    BCK32-1"-12MM-A
    As low as $162.57 $238.43
    Ruland BCK32-1"-12MM-A, 1" x 12mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.000" (50.8mm), OD 2.413" (61.3mm) Length
  19. Ruland BCK32-1/2"-12MM-A, Bellows Coupling
    BCK32-1/2"-12MM-A
    As low as $162.57 $238.43
    Ruland BCK32-1/2"-12MM-A, 1/2" x 12mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.000" (50.8mm), OD 2.413" (61.3mm) Length
  20. Ruland BCK32-3/4"-12MM-A, Bellows Coupling
    BCK32-3/4"-12MM-A
    As low as $162.57 $238.43
    Ruland BCK32-3/4"-12MM-A, 3/4" x 12mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.000" (50.8mm), OD 2.413" (61.3mm) Length
  21. Ruland BCK32-5/8"-12MM-A, Bellows Coupling
    BCK32-5/8"-12MM-A
    As low as $162.57 $238.43
    Ruland BCK32-5/8"-12MM-A, 5/8" x 12mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.000" (50.8mm), OD 2.413" (61.3mm) Length
  22. Ruland BCK32-7/8"-12MM-A, Bellows Coupling
    BCK32-7/8"-12MM-A
    As low as $162.57 $238.43
    Ruland BCK32-7/8"-12MM-A, 7/8" x 12mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.000" (50.8mm), OD 2.413" (61.3mm) Length
  23. Ruland MBC25-12-12-A, Bellows Coupling
    MBC25-12-12-A
    As low as $87.82 $128.81
    Ruland MBC25-12-12-A, 12mm x 12mm Bellows Coupling, High Stiffness, Aluminum, 25.4mm, OD 34.2mm Length
  24. Ruland MBC33-12-12-A, Bellows Coupling
    MBC33-12-12-A
    As low as $94.83 $139.09
    Ruland MBC33-12-12-A, 12mm x 12mm Bellows Coupling, High Stiffness, Aluminum, 33.3mm, OD 43.2mm Length
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