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Bellows Coupling: Inch to Metric
Bellows couplings with inch to metric bore combinations are available with clamp style hubs with or without keyways in bore dimensions ranging from 1/8" (3mm) to 1-3/4" (45mm). Stainless steel hubs and other custom features are available by special order.
Features High torque with low inertia
Balanced design for high RPM
Long Life with no maintenance
High torsional stiffness
Constant velocity
Zero backlash
RoHS3 and REACH Compliant
Maximum speed: 10,000 RPM
Bore tolerance:
+.001 in / -.000 in
+.03mm/–.000mm
Temperature Range: -40°F to 200°F
Material
Aluminum hubs are standard
Stainless steel hubs available upon request
How to Specify Part numbers are in the following format with numbers representing sixteenths of an inch or millimeters:
Products
Download CAD File:
BC21-15MM-1/2\"-A
BC21-15MM-1/2"-A
As low as
$94.83
$139.09
Ruland BC21-15MM-1/2"-A, 15mm x 1/2" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-15MM-3/8\"-A
BC21-15MM-3/8"-A
As low as
$94.83
$139.09
Ruland BC21-15MM-3/8"-A, 15mm x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-15MM-5/16\"-A
BC21-15MM-5/16"-A
As low as
$94.83
$139.09
Ruland BC21-15MM-5/16"-A, 15mm x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-16MM-1/2\"-A
BC21-16MM-1/2"-A
As low as
$94.83
$139.09
Ruland BC21-16MM-1/2"-A, 16mm x 1/2" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-16MM-3/8\"-A
BC21-16MM-3/8"-A
As low as
$94.83
$139.09
Ruland BC21-16MM-3/8"-A, 16mm x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-16MM-5/16\"-A
BC21-16MM-5/16"-A
As low as
$94.83
$139.09
Ruland BC21-16MM-5/16"-A, 16mm x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-16MM-5/8\"-A
BC21-16MM-5/8"-A
As low as
$94.83
$139.09
Ruland BC21-16MM-5/8"-A, 16mm x 5/8" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-3/8\"-8MM-A
BC21-3/8"-8MM-A
As low as
$94.83
$139.09
Ruland BC21-3/8"-8MM-A, 3/8" x 8mm Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-3/8\"-9MM-A
BC21-3/8"-9MM-A
As low as
$94.83
$139.09
Ruland BC21-3/8"-9MM-A, 3/8" x 9mm Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-5/8\"-10MM-A
BC21-5/8"-10MM-A
As low as
$94.83
$139.09
Ruland BC21-5/8"-10MM-A, 5/8" x 10mm Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-5/8\"-11MM-A
BC21-5/8"-11MM-A
As low as
$94.83
$139.09
Ruland BC21-5/8"-11MM-A, 5/8" x 11mm 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:
BC21-5/8\"-13MM-A
BC21-5/8"-13MM-A
As low as
$94.83
$139.09
Ruland BC21-5/8"-13MM-A, 5/8" x 13mm Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-5/8\"-14MM-A
BC21-5/8"-14MM-A
As low as
$94.83
$139.09
Ruland BC21-5/8"-14MM-A, 5/8" x 14mm Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-5/8\"-15MM-A
BC21-5/8"-15MM-A
As low as
$94.83
$139.09
Ruland BC21-5/8"-15MM-A, 5/8" x 15mm Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-5/8\"-8MM-A
BC21-5/8"-8MM-A
As low as
$94.83
$139.09
Ruland BC21-5/8"-8MM-A, 5/8" x 8mm Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-5/8\"-9MM-A
BC21-5/8"-9MM-A
As low as
$94.83
$139.09
Ruland BC21-5/8"-9MM-A, 5/8" x 9mm Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-8MM-5/16\"-A
BC21-8MM-5/16"-A
As low as
$94.83
$139.09
Ruland BC21-8MM-5/16"-A, 8mm x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC21-9MM-5/16\"-A
BC21-9MM-5/16"-A
As low as
$94.83
$139.09
Ruland BC21-9MM-5/16"-A, 9mm x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm) OD, 1.700" (43.2mm) Length
Download CAD File:
BC26-1/2\"-10MM-A
BC26-1/2"-10MM-A
As low as
$105.39
$154.57
Ruland BC26-1/2"-10MM-A, 1/2" x 10mm Bellows Coupling, High Stiffness, Aluminum, 1.625" (41.3mm) OD, 2.035" (51.7mm) Length
Download CAD File:
BC26-1/2\"-11MM-A
BC26-1/2"-11MM-A
As low as
$105.39
$154.57
Ruland BC26-1/2"-11MM-A, 1/2" x 11mm Bellows Coupling, High Stiffness, Aluminum, 1.625" (41.3mm) OD, 2.035" (51.7mm) 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:
BC26-10MM-3/8\"-A
BC26-10MM-3/8"-A
As low as
$105.39
$154.57
Ruland BC26-10MM-3/8"-A, 10mm x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.625" (41.3mm) OD, 2.035" (51.7mm) 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
Part number
Bore (B1)
Small Bore (B2)
Length (L)
Material
Outer Diameter (OD)
Maximum Speed
BC21-15MM-1/2"-A
15 mm
0.5000 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-15MM-3/8"-A
15 mm
0.3750 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-15MM-5/16"-A
15 mm
0.3125 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-16MM-1/2"-A
16 mm
0.5000 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-16MM-3/8"-A
16 mm
0.3750 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-16MM-5/16"-A
16 mm
0.3125 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-16MM-5/8"-A
16 mm
0.6250 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-3/8"-8MM-A
0.3750 in
8 mm
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-3/8"-9MM-A
0.3750 in
9 mm
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-5/8"-10MM-A
0.6250 in
10 mm
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-5/8"-11MM-A
0.6250 in
11 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
BC21-5/8"-13MM-A
0.6250 in
13 mm
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-5/8"-14MM-A
0.6250 in
14 mm
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-5/8"-15MM-A
0.6250 in
15 mm
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-5/8"-8MM-A
0.6250 in
8 mm
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-5/8"-9MM-A
0.6250 in
9 mm
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-8MM-5/16"-A
8 mm
0.3125 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-9MM-5/16"-A
9 mm
0.3125 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC26-1/2"-10MM-A
0.5000 in
10 mm
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BC26-1/2"-11MM-A
0.5000 in
11 mm
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 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
BC26-10MM-3/8"-A
10 mm
0.3750 in
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 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
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