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Double Disc Couplings
Ruland double disc couplings are comprised of two anodized aluminum hubs, two sets of stainless steel disc springs, and a center spacer. This design allows the sets of disc springs to bend independent of each other to accommodate all forms of misalignment, including parallel. Center spacers are available in anodized aluminum or acetal for electrical isolation. Ruland disc couplings are zero-backlash and have a balanced design for reduced vibration at speeds up to 10,000 RPM. They are a simple assembly with few moving parts, reducing the risk of backlash and premature failure. Clamp and set screw hubs are available in bore sizes from 1/8” to 1-1/4” and 3mm to 32mm.
Features High torque
Balanced design for high RPM
Low inertia
No maintenance
High torsional stiffness
Constant velocity
Long life
Zero backlash
RoHS3 and REACH Compliant
Maximum speed: 10,000 RPM
Temperature Range: -10°F to 200°F
How to Specify Part numbers are in the following format with numbers representing sixteenths of an inch or millimeters:
Products
Download CAD File:
DCD16-1/2\"-8MM-A
DCD16-1/2"-8MM-A
As low as
$75.74
$111.08
Ruland DCD16-1/2"-8MM-A, 1/2" x 8mm Double Disc Coupling, Aluminum, Clamp Style, 1.000" (25.4mm) OD, 1.374" (34.9mm) Length
Download CAD File:
DCD16-3/8\"-8MM-A
DCD16-3/8"-8MM-A
As low as
$75.74
$111.08
Ruland DCD16-3/8"-8MM-A, 3/8" x 8mm Double Disc Coupling, Aluminum, Clamp Style, 1.000" (25.4mm) OD, 1.374" (34.9mm) Length
Download CAD File:
DCD21-1/2\"-8MM-A
DCD21-1/2"-8MM-A
As low as
$82.57
$121.10
Ruland DCD21-1/2"-8MM-A, 1/2" x 8mm Double Disc Coupling, Aluminum, Clamp Style, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
Download CAD File:
DCD21-3/8\"-8MM-A
DCD21-3/8"-8MM-A
As low as
$82.57
$121.10
Ruland DCD21-3/8"-8MM-A, 3/8" x 8mm Double Disc Coupling, Aluminum, Clamp Style, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
Download CAD File:
DCD21-5/8\"-8MM-A
DCD21-5/8"-8MM-A
As low as
$82.57
$121.10
Ruland DCD21-5/8"-8MM-A, 5/8" x 8mm Double Disc Coupling, Aluminum, Clamp Style, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
Download CAD File:
DCDK16-1/2\"-8MM-A
DCDK16-1/2"-8MM-A
As low as
$87.59
$128.47
Ruland DCDK16-1/2"-8MM-A, 1/2" x 8mm Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.000" (25.4mm) OD, 1.374" (34.9mm) Length
Download CAD File:
DCDK16-3/8\"-8MM-A
DCDK16-3/8"-8MM-A
As low as
$87.59
$128.47
Ruland DCDK16-3/8"-8MM-A, 3/8" x 8mm Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.000" (25.4mm) OD, 1.374" (34.9mm) Length
Download CAD File:
DCDK21-1/2\"-8MM-A
DCDK21-1/2"-8MM-A
As low as
$96.39
$141.37
Ruland DCDK21-1/2"-8MM-A, 1/2" x 8mm Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
Download CAD File:
DCDK21-3/8\"-8MM-A
DCDK21-3/8"-8MM-A
As low as
$96.39
$141.37
Ruland DCDK21-3/8"-8MM-A, 3/8" x 8mm Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
Download CAD File:
DCDK21-5/8\"-8MM-A
DCDK21-5/8"-8MM-A
As low as
$96.39
$141.37
Ruland DCDK21-5/8"-8MM-A, 5/8" x 8mm Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
Download CAD File:
MDCD19-8-8-A
MDCD19-8-8-A
As low as
$68.17
$99.98
Ruland MDCD19-8-8-A, 8mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 19.1mm OD, 30.2mm Length
Download CAD File:
MDCD25-10-8-A
MDCD25-10-8-A
As low as
$75.74
$111.08
Ruland MDCD25-10-8-A, 10mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 25.4mm OD, 34.9mm Length
Download CAD File:
MDCD25-11-8-A
MDCD25-11-8-A
As low as
$75.74
$111.08
Ruland MDCD25-11-8-A, 11mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 25.4mm OD, 34.9mm Length
Download CAD File:
MDCD25-12-8-A
MDCD25-12-8-A
As low as
$75.74
$111.08
Ruland MDCD25-12-8-A, 12mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 25.4mm OD, 34.9mm Length
Download CAD File:
MDCD25-8-8-A
MDCD25-8-8-A
As low as
$75.74
$111.08
Ruland MDCD25-8-8-A, 8mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 25.4mm OD, 34.9mm Length
Download CAD File:
MDCD25-9-8-A
MDCD25-9-8-A
As low as
$75.74
$111.08
Ruland MDCD25-9-8-A, 9mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 25.4mm OD, 34.9mm Length
Download CAD File:
MDCD33-10-8-A
MDCD33-10-8-A
As low as
$82.57
$121.10
Ruland MDCD33-10-8-A, 10mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 33.3mm OD, 45.0mm Length
Download CAD File:
MDCD33-11-8-A
MDCD33-11-8-A
As low as
$82.57
$121.10
Ruland MDCD33-11-8-A, 11mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 33.3mm OD, 45.0mm Length
Download CAD File:
MDCD33-12-8-A
MDCD33-12-8-A
As low as
$82.57
$121.10
Ruland MDCD33-12-8-A, 12mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 33.3mm OD, 45.0mm Length
Download CAD File:
MDCD33-13-8-A
MDCD33-13-8-A
As low as
$82.57
$121.10
Ruland MDCD33-13-8-A, 13mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 33.3mm OD, 45.0mm Length
Download CAD File:
MDCD33-14-8-A
MDCD33-14-8-A
As low as
$82.57
$121.10
Ruland MDCD33-14-8-A, 14mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 33.3mm OD, 45.0mm Length
Download CAD File:
MDCD33-15-8-A
MDCD33-15-8-A
As low as
$82.57
$121.10
Ruland MDCD33-15-8-A, 15mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 33.3mm OD, 45.0mm Length
Download CAD File:
MDCD33-16-8-A
MDCD33-16-8-A
As low as
$82.57
$121.10
Ruland MDCD33-16-8-A, 16mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 33.3mm OD, 45.0mm Length
Download CAD File:
MDCD33-8-8-A
MDCD33-8-8-A
As low as
$82.57
$121.10
Ruland MDCD33-8-8-A, 8mm x 8mm Double Disc Coupling, Aluminum, Clamp Style, 33.3mm OD, 45.0mm Length
Part number
Bore (B1)
Small Bore (B2)
Length (L)
Material
Outer Diameter (OD)
Maximum Speed
DCD16-1/2"-8MM-A
0.5000 in
8 mm
1.374 in (34.9 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
DCD16-3/8"-8MM-A
0.3750 in
8 mm
1.374 in (34.9 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
DCD21-1/2"-8MM-A
0.5000 in
8 mm
1.770 in (45.0 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
DCD21-3/8"-8MM-A
0.3750 in
8 mm
1.770 in (45.0 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
DCD21-5/8"-8MM-A
0.6250 in
8 mm
1.770 in (45.0 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
DCDK16-1/2"-8MM-A
0.5000 in
8 mm
1.374 in (34.9 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
DCDK16-3/8"-8MM-A
0.3750 in
8 mm
1.374 in (34.9 mm)
Aluminum
1.000 in (25.4 mm)
10,000 RPM
DCDK21-1/2"-8MM-A
0.5000 in
8 mm
1.770 in (45.0 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
DCDK21-3/8"-8MM-A
0.3750 in
8 mm
1.770 in (45.0 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
DCDK21-5/8"-8MM-A
0.6250 in
8 mm
1.770 in (45.0 mm)
Aluminum
1.313 in (33.3 mm)
10,000 RPM
MDCD19-8-8-A
8 mm
8 mm
30.2 mm
Aluminum
19.1 mm
10,000 RPM
MDCD25-10-8-A
10 mm
8 mm
34.9 mm
Aluminum
25.4 mm
10,000 RPM
MDCD25-11-8-A
11 mm
8 mm
34.9 mm
Aluminum
25.4 mm
10,000 RPM
MDCD25-12-8-A
12 mm
8 mm
34.9 mm
Aluminum
25.4 mm
10,000 RPM
MDCD25-8-8-A
8 mm
8 mm
34.9 mm
Aluminum
25.4 mm
10,000 RPM
MDCD25-9-8-A
9 mm
8 mm
34.9 mm
Aluminum
25.4 mm
10,000 RPM
MDCD33-10-8-A
10 mm
8 mm
45.0 mm
Aluminum
33.3 mm
10,000 RPM
MDCD33-11-8-A
11 mm
8 mm
45.0 mm
Aluminum
33.3 mm
10,000 RPM
MDCD33-12-8-A
12 mm
8 mm
45.0 mm
Aluminum
33.3 mm
10,000 RPM
MDCD33-13-8-A
13 mm
8 mm
45.0 mm
Aluminum
33.3 mm
10,000 RPM
MDCD33-14-8-A
14 mm
8 mm
45.0 mm
Aluminum
33.3 mm
10,000 RPM
MDCD33-15-8-A
15 mm
8 mm
45.0 mm
Aluminum
33.3 mm
10,000 RPM
MDCD33-16-8-A
16 mm
8 mm
45.0 mm
Aluminum
33.3 mm
10,000 RPM
MDCD33-8-8-A
8 mm
8 mm
45.0 mm
Aluminum
33.3 mm
10,000 RPM
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8 mm
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