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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:
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:
BC16-12MM-1/4\"-A
BC16-12MM-1/4"-A
As low as
$87.82
$128.81
Ruland BC16-12MM-1/4"-A, 12mm x 1/4" Bellows Coupling, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
Download CAD File:
BC16-12MM-3/8\"-A
BC16-12MM-3/8"-A
As low as
$87.82
$128.81
Ruland BC16-12MM-3/8"-A, 12mm x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
Download CAD File:
BC16-12MM-5/16\"-A
BC16-12MM-5/16"-A
As low as
$87.82
$128.81
Ruland BC16-12MM-5/16"-A, 12mm x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) 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:
BC21-12MM-3/8\"-A
BC21-12MM-3/8"-A
As low as
$94.83
$139.09
Ruland BC21-12MM-3/8"-A, 12mm x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BC21-12MM-5/16\"-A
BC21-12MM-5/16"-A
As low as
$94.83
$139.09
Ruland BC21-12MM-5/16"-A, 12mm x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BC26-12MM-3/8\"-A
BC26-12MM-3/8"-A
As low as
$105.39
$154.57
Ruland BC26-12MM-3/8"-A, 12mm x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.625" (41.3mm), OD 2.035" (51.7mm) Length
Download CAD File:
BCK16-12MM-1/4\"-A
BCK16-12MM-1/4"-A
As low as
$104.27
$152.92
Ruland BCK16-12MM-1/4"-A, 12mm x 1/4" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
Download CAD File:
BCK16-12MM-3/8\"-A
BCK16-12MM-3/8"-A
As low as
$104.27
$152.92
Ruland BCK16-12MM-3/8"-A, 12mm x 3/8" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
Download CAD File:
BCK16-12MM-5/16\"-A
BCK16-12MM-5/16"-A
As low as
$104.27
$152.92
Ruland BCK16-12MM-5/16"-A, 12mm x 5/16" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.000" (25.4mm), OD 1.345" (34.2mm) Length
Download CAD File:
BCK21-12MM-3/8\"-A
BCK21-12MM-3/8"-A
As low as
$113.14
$165.94
Ruland BCK21-12MM-3/8"-A, 12mm x 3/8" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BCK21-12MM-5/16\"-A
BCK21-12MM-5/16"-A
As low as
$113.14
$165.94
Ruland BCK21-12MM-5/16"-A, 12mm x 5/16" Bellows Coupling with Keyways, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BCK26-12MM-3/8\"-A
BCK26-12MM-3/8"-A
As low as
$135.16
$198.24
Ruland BCK26-12MM-3/8"-A, 12mm x 3/8" Bellows Coupling with Keyways, 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
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
BC16-12MM-1/4"-A
12 mm
0.2500 in
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BC16-12MM-3/8"-A
12 mm
0.3750 in
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BC16-12MM-5/16"-A
12 mm
0.3125 in
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
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
BC21-12MM-3/8"-A
12 mm
0.3750 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-12MM-5/16"-A
12 mm
0.3125 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC26-12MM-3/8"-A
12 mm
0.3750 in
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
BCK16-12MM-1/4"-A
12 mm
0.2500 in
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BCK16-12MM-3/8"-A
12 mm
0.3750 in
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BCK16-12MM-5/16"-A
12 mm
0.3125 in
1.345 in (34.2 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
BCK21-12MM-3/8"-A
12 mm
0.3750 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BCK21-12MM-5/16"-A
12 mm
0.3125 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BCK26-12MM-3/8"-A
12 mm
0.3750 in
2.035 in (51.7 mm)
Aluminum
1.625 in (41.3 mm)
10,000 RPM
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Bore (B1)
0.3125 in
Bore (B1)
12 mm
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