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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:
BCK36-1 1/4\"-17MM-A
BCK36-1 1/4"-17MM-A
As low as
$199.99
$293.32
Ruland BCK36-1 1/4"-17MM-A, 1 1/4" x 17mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK36-1 1/4\"-18MM-A
BCK36-1 1/4"-18MM-A
As low as
$199.99
$293.32
Ruland BCK36-1 1/4"-18MM-A, 1 1/4" x 18mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK36-1 1/4\"-19MM-A
BCK36-1 1/4"-19MM-A
As low as
$199.99
$293.32
Ruland BCK36-1 1/4"-19MM-A, 1 1/4" x 19mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK36-1 1/4\"-20MM-A
BCK36-1 1/4"-20MM-A
As low as
$199.99
$293.32
Ruland BCK36-1 1/4"-20MM-A, 1 1/4" x 20mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK36-1 1/4\"-22MM-A
BCK36-1 1/4"-22MM-A
As low as
$199.99
$293.32
Ruland BCK36-1 1/4"-22MM-A, 1 1/4" x 22mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK36-1 1/4\"-24MM-A
BCK36-1 1/4"-24MM-A
As low as
$199.99
$293.32
Ruland BCK36-1 1/4"-24MM-A, 1 1/4" x 24mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK36-1 1/4\"-25MM-A
BCK36-1 1/4"-25MM-A
As low as
$199.99
$293.32
Ruland BCK36-1 1/4"-25MM-A, 1 1/4" x 25mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK36-1 1/4\"-28MM-A
BCK36-1 1/4"-28MM-A
As low as
$199.99
$293.32
Ruland BCK36-1 1/4"-28MM-A, 1 1/4" x 28mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK36-1 1/4\"-30MM-A
BCK36-1 1/4"-30MM-A
As low as
$199.99
$293.32
Ruland BCK36-1 1/4"-30MM-A, 1 1/4" x 30mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.250" (57.2mm), OD 3.235" (82.2mm) Length
Download CAD File:
BCK44-1 1/4\"-20MM-A
BCK44-1 1/4"-20MM-A
As low as
$223.26
$327.45
Ruland BCK44-1 1/4"-20MM-A, 1 1/4" x 20mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.750" (69.9 mm), OD 3.439" (87.4 mm) Length
Download CAD File:
BCK44-1 1/4\"-22MM-A
BCK44-1 1/4"-22MM-A
As low as
$223.26
$327.45
Ruland BCK44-1 1/4"-22MM-A, 1 1/4" x 22mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.750" (69.9 mm), OD 3.439" (87.4 mm) Length
Download CAD File:
BCK44-1 1/4\"-24MM-A
BCK44-1 1/4"-24MM-A
As low as
$223.26
$327.45
Ruland BCK44-1 1/4"-24MM-A, 1 1/4" x 24mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.750" (69.9 mm), OD 3.439" (87.4 mm) Length
Download CAD File:
BCK44-1 1/4\"-25MM-A
BCK44-1 1/4"-25MM-A
As low as
$223.26
$327.45
Ruland BCK44-1 1/4"-25MM-A, 1 1/4" x 25mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.750" (69.9 mm), OD 3.439" (87.4 mm) Length
Download CAD File:
BCK44-1 1/4\"-28MM-A
BCK44-1 1/4"-28MM-A
As low as
$223.26
$327.45
Ruland BCK44-1 1/4"-28MM-A, 1 1/4" x 28mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.750" (69.9 mm), OD 3.439" (87.4 mm) Length
Download CAD File:
BCK44-1 1/4\"-30MM-A
BCK44-1 1/4"-30MM-A
As low as
$223.26
$327.45
Ruland BCK44-1 1/4"-30MM-A, 1 1/4" x 30mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 2.750" (69.9 mm), OD 3.439" (87.4 mm) Length
Download CAD File:
BCK50-1 1/4\"-25MM-A
BCK50-1 1/4"-25MM-A
As low as
$256.75
$376.56
Ruland BCK50-1 1/4"-25MM-A, 1 1/4" x 25mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 3.125" (79.4 mm), OD 3.816" (96.9 mm) Length
Download CAD File:
BCK50-1 1/4\"-28MM-A
BCK50-1 1/4"-28MM-A
As low as
$256.75
$376.56
Ruland BCK50-1 1/4"-28MM-A, 1 1/4" x 28mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 3.125" (79.4 mm), OD 3.816" (96.9 mm) Length
Download CAD File:
BCK50-1 1/4\"-30MM-A
BCK50-1 1/4"-30MM-A
As low as
$256.75
$376.56
Ruland BCK50-1 1/4"-30MM-A, 1 1/4" x 30mm Bellows Coupling with Keyways, High Stiffness, Aluminum, 3.125" (79.4 mm), OD 3.816" (96.9 mm) Length
Part number
Bore (B1)
Small Bore (B2)
Length (L)
Material
Outer Diameter (OD)
Maximum Speed
BCK36-1 1/4"-17MM-A
1.2500 in
17 mm
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK36-1 1/4"-18MM-A
1.2500 in
18 mm
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK36-1 1/4"-19MM-A
1.2500 in
19 mm
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK36-1 1/4"-20MM-A
1.2500 in
20 mm
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK36-1 1/4"-22MM-A
1.2500 in
22 mm
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK36-1 1/4"-24MM-A
1.2500 in
24 mm
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK36-1 1/4"-25MM-A
1.2500 in
25 mm
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK36-1 1/4"-28MM-A
1.2500 in
28 mm
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK36-1 1/4"-30MM-A
1.2500 in
30 mm
3.235 in (82.2 mm)
Aluminum
2.250 in (57.2 mm)
10,000 RPM
BCK44-1 1/4"-20MM-A
1.2500 in
20 mm
3.439 in (87.4 mm)
Aluminum
2.750 in (69.9 mm)
10,000 RPM
BCK44-1 1/4"-22MM-A
1.2500 in
22 mm
3.439 in (87.4 mm)
Aluminum
2.750 in (69.9 mm)
10,000 RPM
BCK44-1 1/4"-24MM-A
1.2500 in
24 mm
3.439 in (87.4 mm)
Aluminum
2.750 in (69.9 mm)
10,000 RPM
BCK44-1 1/4"-25MM-A
1.2500 in
25 mm
3.439 in (87.4 mm)
Aluminum
2.750 in (69.9 mm)
10,000 RPM
BCK44-1 1/4"-28MM-A
1.2500 in
28 mm
3.439 in (87.4 mm)
Aluminum
2.750 in (69.9 mm)
10,000 RPM
BCK44-1 1/4"-30MM-A
1.2500 in
30 mm
3.439 in (87.4 mm)
Aluminum
2.750 in (69.9 mm)
10,000 RPM
BCK50-1 1/4"-25MM-A
1.2500 in
25 mm
3.808 in (96.7 mm)
Aluminum
3.125 in (79.4 mm)
10,000 RPM
BCK50-1 1/4"-28MM-A
1.2500 in
28 mm
3.808 in (96.7 mm)
Aluminum
3.125 in (79.4 mm)
10,000 RPM
BCK50-1 1/4"-30MM-A
1.2500 in
30 mm
3.808 in (96.7 mm)
Aluminum
3.125 in (79.4 mm)
10,000 RPM
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Bore (B1)
1.2500 in
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