Ruland MDCD25-8-8-A
| DIMENSIONS | |||
|---|---|---|---|
| Bore (B1) | 8 mm | Small Bore (B2) | 8 mm |
| B1 Min Shaft Penetration | 8.0 mm | B2 Min Shaft Penetration | 8.0 mm |
| B1 Max Shaft Penetration | 16.6 mm | B2 Max Shaft Penetration | 16.6 mm |
| Outer Diameter (OD) | 25.4 mm | Bore Tolerance | +0.03 mm / -0.00 mm |
| Length (L) | 34.9 mm | Hub Width (LH) | 11.85 mm |
| Recommended Shaft Tolerance | +0.000 mm / -0.013 mm | ||
| FASTENING HARDWARE | |||
| Forged Clamp Screw | M3 | Screw Material | Alloy Steel |
| Hex Wrench Size | 2.5 mm | Screw Finish | Black Oxide |
| Seating Torque | 2.1 Nm | Number of Screws | 2 ea |
| PERFORMANCE SPECIFICATIONS | |||
| Dynamic Torque Reversing | 1.40 Nm | Angular Misalignment | 2.0° |
| Dynamic Torque Non-Reversing | 2.80 Nm | Parallel Misalignment | 0.15 mm |
| Static Torque | 5.6 Nm | Axial Motion | 0.30 mm |
| Torsional Stiffness | 6.9 Nm/Deg | Moment of Inertia | 3.413 x 10-6 kg-m2 |
| Maximum Speed | 10,000 RPM | Full Bearing Support Required? | Yes |
| Zero-Backlash? | Yes | Balanced Design | Yes |
| RECOMMENDED INSTALLATION TOOLS | |||
| Torque Wrench | TW:BT-1R-1/4-18.3 | Recommended Hex Key | Metric Hex Keys |
| ADDITIONAL INFORMATION | |||
| Material Specification | Hubs and Center Spacer: 2024-T351 Aluminum Bar Disc Springs: Type 302 Stainless Steel | Temperature | -40°F to 200°F (-40°C to 93°C) |
| 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) | 0.082000 |
| UPC | 634529084052 | Tariff Code | 8483.60.8000 |
| UNSPC | 31163008 | ||
Ruland disc couplings are zero-backlash, torsionally stiff, and have a balanced design. They are manufactured in single disc styles for compact installations and double disc styles for increased misalignment capabilities.
They are made from black anodized aluminum hubs and multiple flat stainless steel disc springs. Double disc styles also include a center spacer allowing the coupling to accommodate all forms of misalignment including parallel. They are well suited for high precision positioning systems found in semiconductor, solar, printing, and machine tools.
Combining aluminum hubs with stainless disc springs results in a lightweight, low inertia coupling that is well suited for precision applications found in a variety of industries including semiconductor, solar, printing, and machine tools.
Disc couplings are a simple assembly with few moving parts reducing the risk for coupling failure and backlash. Ruland uses a balanced design to reduce vibration in high RPM applications of up to 10,000 PRM.
Ruland disc couplings are carefully made from select bar stock sourced exclusively from North American mills and are machined to a fine burr-free finish. Hardware tests beyond DIN 912 12.9 standards for maximum torqueing capabilities.
Ruland, founded in 1937, manufactures all products in our Marlborough, MA USA factory under strict controls using proprietary processes. Disc couplings are RoHS2 and REACH compliant.
