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Bellows Couplings for Motors
Bellows couplings are zero-backlash and constructed of two anodized aluminum hubs and a stainless steel bellows that serves as the flexible element. This design results in a low inertia zero-backlash coupling that is a good choice for motors coupled to ball screw driven actuators in precision applications. The thin walls of the bellows allow the coupling to flex under misalignment conditions and remain rigid under torsional loads. Bellows couplings have the highest size-for-size torque and torsional stiffness of all Ruland flexible couplings and are preferred in applications where the highest level of accuracy and responsiveness is required.
Ruland bellows coupling have a balanced design for reduced vibration at speeds up to 10,000 RPM. Bore sizes are available from 1/8” to 1” and 3mm to 25mm and hubs are manufactured in clamp and set screw styles with and without keyways.
Products
Download CAD File:
BC16-1/2\"-12MM-A
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
Download CAD File:
BC21-1/2\"-12MM-A
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
Download CAD File:
BC21-5/8\"-12MM-A
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
Download CAD File:
BC26-1/2\"-12MM-A
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
Download CAD File:
BC26-3/4\"-12MM-A
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
Download CAD File:
BC26-5/8\"-12MM-A
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
Download CAD File:
BC32-1\"-12MM-A
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
Download CAD File:
BC32-1/2\"-12MM-A
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
Download CAD File:
BC32-3/4\"-12MM-A
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
Download CAD File:
BC32-5/8\"-12MM-A
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
Download CAD File:
BC32-7/8\"-12MM-A
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
Download CAD File:
BCK16-1/2\"-12MM-A
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
Download CAD File:
BCK21-1/2\"-12MM-A
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
Download CAD File:
BCK21-5/8\"-12MM-A
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
Download CAD File:
BCK26-1/2\"-12MM-A
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
Download CAD File:
BCK26-3/4\"-12MM-A
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
Download CAD File:
BCK26-5/8\"-12MM-A
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
Download CAD File:
BCK32-1\"-12MM-A
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
Download CAD File:
BCK32-1/2\"-12MM-A
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
Download CAD File:
BCK32-3/4\"-12MM-A
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
Download CAD File:
BCK32-5/8\"-12MM-A
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
Download CAD File:
BCK32-7/8\"-12MM-A
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
Download CAD File:
MBC25-12-12-A
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
Download CAD File:
MBC33-12-12-A
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
Part number
Bore (B1)
Small Bore (B2)
Length (L)
Material
Outer Diameter (OD)
Maximum Speed
BC16-1/2"-12MM-A
0.5000 in
12 mm
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BC21-1/2"-12MM-A
0.5000 in
12 mm
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-5/8"-12MM-A
0.6250 in
12 mm
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC26-1/2"-12MM-A
0.5000 in
12 mm
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BC26-3/4"-12MM-A
0.7500 in
12 mm
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BC26-5/8"-12MM-A
0.6250 in
12 mm
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BC32-1"-12MM-A
1.0000 in
12 mm
2.413 in (61.3 mm)
Aluminum
2.000 in (50.8 mm)
10,000 RPM
BC32-1/2"-12MM-A
0.5000 in
12 mm
2.413 in (61.3 mm)
Aluminum
2.000 in (50.8 mm)
10,000 RPM
BC32-3/4"-12MM-A
0.7500 in
12 mm
2.413 in (61.3 mm)
Aluminum
2.000 in (50.8 mm)
10,000 RPM
BC32-5/8"-12MM-A
0.6250 in
12 mm
2.413 in (61.3 mm)
Aluminum
2.000 in (50.8 mm)
10,000 RPM
BC32-7/8"-12MM-A
0.8750 in
12 mm
2.413 in (61.3 mm)
Aluminum
2.000 in (50.8 mm)
10,000 RPM
BCK16-1/2"-12MM-A
0.5000 in
12 mm
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BCK21-1/2"-12MM-A
0.5000 in
12 mm
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BCK21-5/8"-12MM-A
0.6250 in
12 mm
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BCK26-1/2"-12MM-A
0.5000 in
12 mm
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BCK26-3/4"-12MM-A
0.7500 in
12 mm
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BCK26-5/8"-12MM-A
0.6250 in
12 mm
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BCK32-1"-12MM-A
1.0000 in
12 mm
2.413 in (61.3 mm)
Aluminum
2.000 in (50.8 mm)
10,000 RPM
BCK32-1/2"-12MM-A
0.5000 in
12 mm
2.413 in (61.3 mm)
Aluminum
2.000 in (50.8 mm)
10,000 RPM
BCK32-3/4"-12MM-A
0.7500 in
12 mm
2.413 in (61.3 mm)
Aluminum
2.000 in (50.8 mm)
10,000 RPM
BCK32-5/8"-12MM-A
0.6250 in
12 mm
2.413 in (61.3 mm)
Aluminum
2.000 in (50.8 mm)
10,000 RPM
BCK32-7/8"-12MM-A
0.8750 in
12 mm
2.413 in (61.3 mm)
Aluminum
2.000 in (50.8 mm)
10,000 RPM
MBC25-12-12-A
12 mm
12 mm
34.2 mm
Aluminum
25.4 mm
10,000 RPM
MBC33-12-12-A
12 mm
12 mm
43.2 mm
Aluminum
33.3 mm
10,000 RPM
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