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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:
BC16-11MM-1/4\"-A
BC16-11MM-1/4"-A
As low as
$87.82
$128.81
Ruland BC16-11MM-1/4"-A, 11mm x 1/4" Bellows Coupling, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
Download CAD File:
BC16-11MM-3/8\"-A
BC16-11MM-3/8"-A
As low as
$87.82
$128.81
Ruland BC16-11MM-3/8"-A, 11mm x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
Download CAD File:
BC16-11MM-5/16\"-A
BC16-11MM-5/16"-A
As low as
$87.82
$128.81
Ruland BC16-11MM-5/16"-A, 11mm x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
Download CAD File:
BC21-11MM-3/8\"-A
BC21-11MM-3/8"-A
As low as
$94.83
$139.09
Ruland BC21-11MM-3/8"-A, 11mm x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BC21-11MM-5/16\"-A
BC21-11MM-5/16"-A
As low as
$94.83
$139.09
Ruland BC21-11MM-5/16"-A, 11mm x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BC26-11MM-3/8\"-A
BC26-11MM-3/8"-A
As low as
$105.39
$154.57
Ruland BC26-11MM-3/8"-A, 11mm x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.625" (41.3mm), OD 2.035" (51.7mm) Length
Download CAD File:
BC36-30MM-1 1/8\"-A
BC36-30MM-1 1/8"-A
As low as
$172.38
$252.82
Ruland BC36-30MM-1 1/8"-A, 30mm x 1 1/8" Bellows Coupling, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BC36-30MM-1\"-A
BC36-30MM-1"-A
As low as
$172.38
$252.82
Ruland BC36-30MM-1"-A, 30mm x 1" Bellows Coupling, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BC36-30MM-1/2\"-A
BC36-30MM-1/2"-A
As low as
$172.38
$252.82
Ruland BC36-30MM-1/2"-A, 30mm x 1/2" Bellows Coupling, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BC36-30MM-3/4\"-A
BC36-30MM-3/4"-A
As low as
$172.38
$252.82
Ruland BC36-30MM-3/4"-A, 30mm x 3/4" Bellows Coupling, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BC36-30MM-5/8\"-A
BC36-30MM-5/8"-A
As low as
$172.38
$252.82
Ruland BC36-30MM-5/8"-A, 30mm x 5/8" Bellows Coupling, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BC36-30MM-7/8\"-A
BC36-30MM-7/8"-A
As low as
$172.38
$252.82
Ruland BC36-30MM-7/8"-A, 30mm x 7/8" Bellows Coupling, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK16-11MM-1/4\"-A
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
Download CAD File:
BCK16-11MM-3/8\"-A
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
Download CAD File:
BCK16-11MM-5/16\"-A
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
Download CAD File:
BCK21-11MM-3/8\"-A
BCK21-11MM-3/8"-A
As low as
$113.14
$165.94
Ruland BCK21-11MM-3/8"-A, 11mm x 3/8" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BCK21-11MM-5/16\"-A
BCK21-11MM-5/16"-A
As low as
$113.14
$165.94
Ruland BCK21-11MM-5/16"-A, 11mm x 5/16" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BCK26-11MM-3/8\"-A
BCK26-11MM-3/8"-A
As low as
$135.16
$198.24
Ruland BCK26-11MM-3/8"-A, 11mm x 3/8" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.625" (41.3mm), OD 2.035" (51.7mm) Length
Download CAD File:
BCK36-30MM-1 1/8\"-A
BCK36-30MM-1 1/8"-A
As low as
$199.99
$293.32
Ruland BCK36-30MM-1 1/8"-A, 30mm x 1 1/8" Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK36-30MM-1\"-A
BCK36-30MM-1"-A
As low as
$199.99
$293.32
Ruland BCK36-30MM-1"-A, 30mm x 1" Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK36-30MM-1/2\"-A
BCK36-30MM-1/2"-A
As low as
$199.99
$293.32
Ruland BCK36-30MM-1/2"-A, 30mm x 1/2" Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK36-30MM-3/4\"-A
BCK36-30MM-3/4"-A
As low as
$199.99
$293.32
Ruland BCK36-30MM-3/4"-A, 30mm x 3/4" Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK36-30MM-5/8\"-A
BCK36-30MM-5/8"-A
As low as
$199.99
$293.32
Ruland BCK36-30MM-5/8"-A, 30mm x 5/8" Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK36-30MM-7/8\"-A
BCK36-30MM-7/8"-A
As low as
$199.99
$293.32
Ruland BCK36-30MM-7/8"-A, 30mm x 7/8" Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Part number
Bore (B1)
Small Bore (B2)
Length (L)
Material
Outer Diameter (OD)
Maximum Speed
BC16-11MM-1/4"-A
11 mm
0.2500 in
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BC16-11MM-3/8"-A
11 mm
0.3750 in
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BC16-11MM-5/16"-A
11 mm
0.3125 in
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BC21-11MM-3/8"-A
11 mm
0.3750 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-11MM-5/16"-A
11 mm
0.3125 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC26-11MM-3/8"-A
11 mm
0.3750 in
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BC36-30MM-1 1/8"-A
30 mm
1.1250 in
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BC36-30MM-1"-A
30 mm
1.0000 in
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BC36-30MM-1/2"-A
30 mm
0.5000 in
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BC36-30MM-3/4"-A
30 mm
0.7500 in
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BC36-30MM-5/8"-A
30 mm
0.6250 in
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BC36-30MM-7/8"-A
30 mm
0.8750 in
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK16-11MM-1/4"-A
11 mm
0.2500 in
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BCK16-11MM-3/8"-A
11 mm
0.3750 in
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BCK16-11MM-5/16"-A
11 mm
0.3125 in
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BCK21-11MM-3/8"-A
11 mm
0.3750 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BCK21-11MM-5/16"-A
11 mm
0.3125 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BCK26-11MM-3/8"-A
11 mm
0.3750 in
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BCK36-30MM-1 1/8"-A
30 mm
1.1250 in
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK36-30MM-1"-A
30 mm
1.0000 in
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK36-30MM-1/2"-A
30 mm
0.5000 in
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK36-30MM-3/4"-A
30 mm
0.7500 in
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK36-30MM-5/8"-A
30 mm
0.6250 in
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK36-30MM-7/8"-A
30 mm
0.8750 in
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
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