DSDK21-8-6-A
$184.06
ea
Ruland DSDK21-8-6-A, 1/2" x 3/8" Double Disc Coupling, Aluminum, Set Screw Style With Keyway, 1.313" OD, 1.770" Length
PRODUCT SPECIFICATIONS
Ruland DSDK21-8-6-A is a double disc coupling with 1/2" x 3/8" bores, 1.313" OD, 1.770" length, and 1/8" x 3/32" keyways. It is zero-backlash and has a balanced design for reduced vibration at high speeds. The double disc design is comprised of two anodized aluminum hubs, two sets of thin stainless steel disc springs, and a center spacer allowing each disc to bend individually and accommodate all types of misalignment. DSDK21-8-6-A is lightweight and has low inertia making it well suited for applications with speeds up to 10,000 RPM. Hardware is metric and tests beyond DIN 912 12.9 standards for maximum torque capabilities. Ruland manufactures DSDK21-8-6-A to be torisionally rigid and an excellent fit for precise positioning stepper servo applications commonly found in semiconductor, solar, printing, machine tool, and test and measurement systems. It is machined from solid bar stock that is sourced exclusively from North American mills and RoHS2 and REACH compliant. DSDK21-8-6-A is manufactured in our Marlborough, MA factory under strict controls using proprietary processes.
PRODUCT SPECIFICATIONS
| Dimensions | |||
|---|---|---|---|
Large Bore B1 |
0.500 in |
Small Bore B2 |
0.375 in |
B1 Shaft Penetration |
0.842 in |
B2 Shaft Penetration |
0.842 in |
Keyway K |
1/8 in |
Keyway K2 |
3/32 in |
Bore Tolerance |
+.001 in / -.000 in |
Outer Diameter OD |
1.313 in |
Length L |
1.770 in |
Hub Width LH |
0.590 in |
| Fastening Hardware | |||
Forged Set Screw |
M4 |
Number of Screws |
4 ea |
Screw Material |
Alloy Steel |
Screw Finish |
Black Oxide |
Hex Wrench Size |
2.0 mm |
Seating Torque |
2.2 Nm |
| Performance Specifications | |||
Static Torque |
100 lb-in |
Angular Misalignment |
2.0° |
Dynamic Torque Non-Reversing |
50 lb-in |
Parallel Misalignment |
0.008 in |
Dynamic Torque Reversing |
25 lb-in |
Axial Motion |
0.016 in |
Torsional Stiffness |
253 lb-in/Deg |
Maximum Speed |
10,000 RPM |
| Additional Information | |||
Material Specification |
Hubs and Center Spacer: 2024-T351 Aluminum Bar |
Temperature |
-10°F to 200°F |
Finish Specification |
Sulfuric Anodized MIL-A-8625 Type II, Class 2 and ASTM B580 Type B Black Anodize |
Manufacturer |
Ruland Manufacturing |
Country of Origin |
USA |
Weight (lbs.) |
0.1650 |
UPC |
63452918676 |
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| Product Notes | |||
Note 1 |
Stainless steel hubs are available upon request. |
Note 2 |
Torque ratings are at maximum misalignment. |
Note 3 |
Performance ratings are for guidance only. The user must determine suitability for a particular application. |
Note 4 |
Torque ratings for the couplings are based on the physical limitations/failure point of the disc springs. Under normal/typical conditions the hubs are capable of holding up to the rated torque of the disc springs. In some cases, especially when the smallest standard bores are used or where shafts are undersized, slippage on the shaft is possible below the rated torque of the disc springs. Keyways are available to provide additional torque capacity in the shaft/hub connection when required. Please consult technical support for more assistance. |
Prop 65 |
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WARNING This product can expose you to chemicals including Ethylene Thiourea and Nickel (metallic), known to the State of California to cause cancer, and Ethylene Thiourea known to the State of California to cause birth defects or other reproductive harm. For more information go to 
