Double Disc Coupling – Ultra-High Rigidity Precision Coupling

The Double Disc Coupling is our ultra-high rigidity precision coupling product, featuring a two parallel sets of stainless steel discs + center spacer structure. This series follows the dimension conventions used by the major disc-coupling makers; stack height and bolt circle are confirmed per size. The double disc design delivers the highest torsional rigidity and optimal misalignment compensation capability, suitable for ultra-high precision, ultra-high rigidity, and high torque transmission applications. Ideal for high-end CNC machine tools, semiconductor equipment, laser processing equipment, and more.

Key Features

  • Assembly Replacement – Direct replacement of existing same-type assemblies in customer equipment; custom bore machining available per customer drawings
  • Absolute Zero Backlash – Rigid metal disc connection ensures no lost motion during forward/reverse operation
  • Ultra-High Torsional Rigidity – Double disc parallel arrangement delivers the highest torsional rigidity among coupling types
  • Superior Misalignment Compensation – Best-in-class comprehensive compensation capability; significantly reduces additional bending moment load on bearings caused by misalignment
  • High Torque Capacity – Higher torque transmission capability than single disc design at same outer dimensions
  • All-Metal Maintenance-Free – No wearing parts, no lubrication required, suitable for long-term continuous operation

Couplings have no cross-brand model codes, so select on torque and bore instead. Start from our cross reference overview.

Pairs well with: SFK ball screws · BK / BF support units · single disc couplings
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Full Specifications

Double Disc Coupling — Dimensions — Performance

Values as published by RFU Motion. Subject to change without notice.

Model No. d1/d2 D L S W F M Wrench Torque (N.m) Rated torque (N.m)
CDC3-C019ARFUMOTION.COM 3 4 5 6 6.35 8 19.5 27 5 2 9 M2.5 1 1
CDC3-C026ARFUMOTION.COM 5 6 6.35 8 10 26 35 7 2.5 11.5 M3 1.5 1.4
CDC3-C034ARFUMOTION.COM 6 8 10 12 14 34 45 10 3.5 14 M4 1.5 2.8
CDC3-C039ARFUMOTION.COM 8 10 12 14 15 16 39 49 11 4 15 M4 2.5 5.8
CDC3-C044ARFUMOTION.COM 8 10 12 14 15 16 17 18 19 20 44 50 11 4.5 15 M4 2.5 8.7
CDC3-C056ARFUMOTION.COM 12 14 15 16 17 18 19 20 22 24 25 56 63 12 5.5 20 M5 7 25
CDC3-C068ARFUMOTION.COM 16 18 20 22 24 25 28 30 32 68 74 14 6 24 M6 12 55
CDC3-C082ARFUMOTION.COM 20 22 24 25 28 30 32 35 38 82 98 22 8 30 M8 16 80
CDC3-C094ARFUMOTION.COM 25 28 30 32 35 38 40 94 98 22 8 30 M8 28 185
CDC3-C104ARFUMOTION.COM 30 32 35 38 40 45 104 102 22 10 30 M8 28 255

Double Disc Coupling — Dimensions — Performance

All dimensions in mm unless otherwise noted.

Model No. Max torque (N.m) Maximum speed (rpm) Moment of inertia (kg.m2) Static Torsional Stiffness (N.m/rad) Errors of ECCentricity (mm) Errors of Angularity (°) Errors of shaft end-play (mm)
CDC3-C019ARFUMOTION.COM 2 10000 0.9×10-6 170 0.04 1.5 ±0.4
CDC3-C026ARFUMOTION.COM 2.8 10000 3.3×10-6 950 0.04 1.5 ±0.4
CDC3-C034ARFUMOTION.COM 5.6 10000 8.7×10-6 1960 0.04 1.5 ±0.4
CDC3-C039ARFUMOTION.COM 11.6 10000 2.4×10-5 4500 0.04 1.5 ±0.4
CDC3-C044ARFUMOTION.COM 17.4 10000 3.2×10-5 5100 0.04 1.5 ±0.4
CDC3-C056ARFUMOTION.COM 50 10000 1.1×10-4 10500 0.04 1.5 ±0.4
CDC3-C068ARFUMOTION.COM 110 10000 2.8×10-4 18500 0.04 1.5 ±0.4
CDC3-C082ARFUMOTION.COM 160 10000 1.0×10-3 21800 0.04 1.5 ±0.4
CDC3-C094ARFUMOTION.COM 370 10000 1.76×10-3 84500 0.04 1.5 ±0.4
CDC3-C104ARFUMOTION.COM 510 10000 1.86×10-3 125500 0.04 1.5 ±0.4
Double Disc Coupling – Ultra-High Rigidity Precision Coupling

© RFU Motion. Specifications subject to change without notice.

For the latest specs, please contact us.

Custom Manufacturing Available

Standard ball screws and linear guides don't always fit your design. Here's what RFU MOTION can customize based on your drawings:

  • Shaft end machining — machined precisely to your drawing
  • Screw length — cut to your exact requirement
  • Preload — light, medium, heavy, or custom value
  • Nut type — standard flange, special shape, or non-standard mounting interface
  • Rail length — continuous cutting with end finishing (chamfer or grinding)
  • Mounting holes — special thread sizes, hole spacing, or countersunk dimensions

Send us your drawing or specs — we'll deliver exactly what you need.

📦 MOQ: 1 piece / 1 set

⏱️ Lead time: Standard custom 5-7 days | Complex custom 7-15 days | Wire cutting +2 days

Request Custom Quote →