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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:
BC12-5-3-A
BC12-5-3-A
As low as
$79.05
$115.94
Ruland BC12-5-3-A, 5/16" x 3/16" Bellows Coupling, Aluminum, Clamp Style, 0.750" OD, 1.303" Length
Download CAD File:
BC12-5-4-A
BC12-5-4-A
As low as
$79.05
$115.94
Ruland BC12-5-4-A, 5/16" x 1/4" Bellows Coupling, Aluminum, Clamp Style, 0.750" OD, 1.303" Length
Download CAD File:
BC12-5-5-A
BC12-5-5-A
As low as
$79.05
$115.94
Ruland BC12-5-5-A, 5/16" x 5/16" Bellows Coupling, Aluminum, Clamp Style, 0.750" OD, 1.303" Length
Download CAD File:
BC12-5/16\"-4MM-A
BC12-5/16"-4MM-A
As low as
$79.05
$115.94
Ruland BC12-5/16"-4MM-A, 5/16" x 4mm Bellows Coupling, Aluminum, Clamp Style, 0.750" (19.1mm) OD, 1.303" (33.1mm) Length
Download CAD File:
BC12-5/16\"-5MM-A
BC12-5/16"-5MM-A
As low as
$79.05
$115.94
Ruland BC12-5/16"-5MM-A, 5/16" x 5mm Bellows Coupling, Aluminum, Clamp Style, 0.750" (19.1mm) OD, 1.303" (33.1mm) Length
Download CAD File:
BC12-5/16\"-6MM-A
BC12-5/16"-6MM-A
As low as
$79.05
$115.94
Ruland BC12-5/16"-6MM-A, 5/16" x 6mm Bellows Coupling, Aluminum, Clamp Style, 0.750" (19.1mm) OD, 1.303" (33.1mm) Length
Download CAD File:
BC12-5/16\"-7MM-A
BC12-5/16"-7MM-A
As low as
$79.05
$115.94
Ruland BC12-5/16"-7MM-A, 5/16" x 7mm Bellows Coupling, Aluminum, Clamp Style, 0.750" (19.1mm) OD, 1.303" (33.1mm) Length
Download CAD File:
BC16-5-4-A
BC16-5-4-A
As low as
$87.82
$128.81
Ruland BC16-5-4-A, 5/16" x 1/4" Bellows Coupling, High Stiffness, Aluminum, 1.000", OD 1.345" Length
Download CAD File:
BC16-5-5-A
BC16-5-5-A
As low as
$87.82
$128.81
Ruland BC16-5-5-A, 5/16" x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.000", OD 1.345" Length
Download CAD File:
BC16-5/16\"-6MM-A
BC16-5/16"-6MM-A
As low as
$87.82
$128.81
Ruland BC16-5/16"-6MM-A, 5/16" x 6mm Bellows Coupling, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
Download CAD File:
BC16-5/16\"-7MM-A
BC16-5/16"-7MM-A
As low as
$87.82
$128.81
Ruland BC16-5/16"-7MM-A, 5/16" x 7mm Bellows Coupling, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
Download CAD File:
BC21-13MM-1/2\"-A
BC21-13MM-1/2"-A
As low as
$94.83
$139.09
Ruland BC21-13MM-1/2"-A, 13mm x 1/2" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BC21-13MM-3/8\"-A
BC21-13MM-3/8"-A
As low as
$94.83
$139.09
Ruland BC21-13MM-3/8"-A, 13mm x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BC21-13MM-5/16\"-A
BC21-13MM-5/16"-A
As low as
$94.83
$139.09
Ruland BC21-13MM-5/16"-A, 13mm x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BC21-5-5-A
BC21-5-5-A
As low as
$94.83
$139.09
Ruland BC21-5-5-A, 5/16" x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.313", OD 1.700" Length
Download CAD File:
BC26-13MM-1/2\"-A
BC26-13MM-1/2"-A
As low as
$105.39
$154.57
Ruland BC26-13MM-1/2"-A, 13mm x 1/2" Bellows Coupling, High Stiffness, Aluminum, 1.625" (41.3mm), OD 2.035" (51.7mm) Length
Download CAD File:
BC26-13MM-3/8\"-A
BC26-13MM-3/8"-A
As low as
$105.39
$154.57
Ruland BC26-13MM-3/8"-A, 13mm x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.625" (41.3mm), OD 2.035" (51.7mm) Length
Download CAD File:
BC32-13MM-1/2\"-A
BC32-13MM-1/2"-A
As low as
$126.47
$185.49
Ruland BC32-13MM-1/2"-A, 13mm x 1/2" Bellows Coupling, High Stiffness, Aluminum, 2.000" (50.8mm), OD 2.413" (61.3mm) Length
Download CAD File:
BCK21-13MM-1/2\"-A
BCK21-13MM-1/2"-A
As low as
$113.14
$165.94
Ruland BCK21-13MM-1/2"-A, 13mm x 1/2" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BCK21-13MM-3/8\"-A
BCK21-13MM-3/8"-A
As low as
$113.14
$165.94
Ruland BCK21-13MM-3/8"-A, 13mm x 3/8" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BCK21-13MM-5/16\"-A
BCK21-13MM-5/16"-A
As low as
$113.14
$165.94
Ruland BCK21-13MM-5/16"-A, 13mm x 5/16" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BCK26-13MM-1/2\"-A
BCK26-13MM-1/2"-A
As low as
$135.16
$198.24
Ruland BCK26-13MM-1/2"-A, 13mm x 1/2" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.625" (41.3mm), OD 2.035" (51.7mm) Length
Download CAD File:
BCK26-13MM-3/8\"-A
BCK26-13MM-3/8"-A
As low as
$135.16
$198.24
Ruland BCK26-13MM-3/8"-A, 13mm x 3/8" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.625" (41.3mm), OD 2.035" (51.7mm) Length
Download CAD File:
BCK32-13MM-1/2\"-A
BCK32-13MM-1/2"-A
As low as
$162.57
$238.43
Ruland BCK32-13MM-1/2"-A, 13mm x 1/2" Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.000" (50.8mm), OD 2.413" (61.3mm) Length
Part number
Bore (B1)
Small Bore (B2)
Length (L)
Material
Outer Diameter (OD)
Maximum Speed
BC12-5-3-A
0.3125 in
0.1875 in
1.306 in
Aluminum
0.750 in
10,000 RPM
BC12-5-4-A
0.3125 in
0.2500 in
1.306 in
Aluminum
0.750 in
10,000 RPM
BC12-5-5-A
0.3125 in
0.3125 in
1.306 in
Aluminum
0.750 in
10,000 RPM
BC12-5/16"-4MM-A
0.3125 in
4 mm
1.306 in (33.2 mm)
Aluminum
0.750 in (19.1 mm)
10,000 RPM
BC12-5/16"-5MM-A
0.3125 in
5 mm
1.306 in (33.2 mm)
Aluminum
0.750 in (19.1 mm)
10,000 RPM
BC12-5/16"-6MM-A
0.3125 in
6 mm
1.306 in (33.2 mm)
Aluminum
0.750 in (19.1 mm)
10,000 RPM
BC12-5/16"-7MM-A
0.3125 in
7 mm
1.306 in (33.2 mm)
Aluminum
0.750 in (19.1 mm)
10,000 RPM
BC16-5-4-A
0.3125 in
0.2500 in
1.345 in
Aluminum
1.000 in
10,000 RPM
BC16-5-5-A
0.3125 in
0.3125 in
1.345 in
Aluminum
1.000 in
10,000 RPM
BC16-5/16"-6MM-A
0.3125 in
6 mm
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BC16-5/16"-7MM-A
0.3125 in
7 mm
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BC21-13MM-1/2"-A
13 mm
0.5000 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-13MM-3/8"-A
13 mm
0.3750 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-13MM-5/16"-A
13 mm
0.3125 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-5-5-A
0.3125 in
0.3125 in
1.700 in
Aluminum
1.313 in
10,000 RPM
BC26-13MM-1/2"-A
13 mm
0.5000 in
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BC26-13MM-3/8"-A
13 mm
0.3750 in
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BC32-13MM-1/2"-A
13 mm
0.5000 in
2.413 in (61.3 mm)
Aluminum
2.000 in (50.8 mm)
10,000 RPM
BCK21-13MM-1/2"-A
13 mm
0.5000 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BCK21-13MM-3/8"-A
13 mm
0.3750 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BCK21-13MM-5/16"-A
13 mm
0.3125 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BCK26-13MM-1/2"-A
13 mm
0.5000 in
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BCK26-13MM-3/8"-A
13 mm
0.3750 in
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BCK32-13MM-1/2"-A
13 mm
0.5000 in
2.413 in (61.3 mm)
Aluminum
2.000 in (50.8 mm)
10,000 RPM
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Bore (B1)
0.3125 in
Bore (B1)
13 mm
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