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Bellows Couplings for Encoders
Ruland bellows couplings are comprised of two anodized aluminum and a stainless steel bellows creating a low inertia zero-backlash coupling that is well suited for speeds up to 10,000 RPM. The thin wall of the bellows allows the coupling to remain flexible under misalignment conditions while maintaining rigidity under torsional loads. They are the most torsionally stiff flexible coupling Ruland offers making them a good fit for encoders that require the highest level of resolution. When designers select a bellows coupling for an encoder they must control for misalignment. While bellows couplings to accommodate all forms of misalignment, they are not as flexible as beam or controlflex types. Bellows couplings are manufactured in our Marlborough, Massachusetts factory with bore sizes ranging from 1/8” to 1” or 3mm to 25mm.
Products
Download CAD File:
BC21-14MM-3/8\"-A
BC21-14MM-3/8"-A
As low as
$94.83
$139.09
Ruland BC21-14MM-3/8"-A, 14mm x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
Download CAD File:
BC21-14MM-5/16\"-A
BC21-14MM-5/16"-A
As low as
$94.83
$139.09
Ruland BC21-14MM-5/16"-A, 14mm x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.313" (33.3mm), OD 1.700" (43.2mm) Length
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:
BC21-5-5-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:
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:
BC21-6-5-A
BC21-6-5-A
As low as
$94.83
$139.09
Ruland BC21-6-5-A, 3/8" x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.313", OD 1.700" Length
Download CAD File:
BC21-6-6-A
BC21-6-6-A
As low as
$94.83
$139.09
Ruland BC21-6-6-A, 3/8" x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.313", OD 1.700" Length
Download CAD File:
BC21-8-5-A
BC21-8-5-A
As low as
$94.83
$139.09
Ruland BC21-8-5-A, 1/2" x 5/16" Bellows Coupling, High Stiffness, Aluminum, 1.313", OD 1.700" Length
Download CAD File:
BC21-8-6-A
BC21-8-6-A
As low as
$94.83
$139.09
Ruland BC21-8-6-A, 1/2" x 3/8" Bellows Coupling, High Stiffness, Aluminum, 1.313", OD 1.700" Length
Part number
Bore (B1)
Small Bore (B2)
Length (L)
Material
Outer Diameter (OD)
Maximum Speed
BC21-14MM-3/8"-A
14 mm
0.3750 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
BC21-14MM-5/16"-A
14 mm
0.3125 in
1.700 in (43.2 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
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
BC21-5-5-A
0.3125 in
0.3125 in
1.700 in
Aluminum
1.313 in
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
BC21-6-5-A
0.3750 in
0.3125 in
1.700 in
Aluminum
1.313 in
10,000 RPM
BC21-6-6-A
0.3750 in
0.3750 in
1.700 in
Aluminum
1.313 in
10,000 RPM
BC21-8-5-A
0.5000 in
0.3125 in
1.700 in
Aluminum
1.313 in
10,000 RPM
BC21-8-6-A
0.5000 in
0.3750 in
1.700 in
Aluminum
1.313 in
10,000 RPM
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