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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
    Line DrawingLine Drawing

    How to Specify

    Part numbers are in the following format with numbers representing sixteenths of an inch or millimeters:

    Part Number Identification

    Products

    View as Grid Table

    Items 601-624 of 1889

    Set Descending Direction
    1. Ruland DCDK21-13MM-3/8"-A, Double Disc Coupling
      DCDK21-13MM-3/8"-A
      As low as $98.31 $144.19
      Ruland DCDK21-13MM-3/8"-A, 13mm x 3/8" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    2. Ruland DCDK21-13MM-5/16"-A, Double Disc Coupling
      DCDK21-13MM-5/16"-A
      As low as $98.31 $144.19
      Ruland DCDK21-13MM-5/16"-A, 13mm x 5/16" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    3. Ruland DCDK21-14MM-1/2"-A, Double Disc Coupling
      DCDK21-14MM-1/2"-A
      As low as $98.31 $144.19
      Ruland DCDK21-14MM-1/2"-A, 14mm x 1/2" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    4. Ruland DCDK21-14MM-3/8"-A, Double Disc Coupling
      DCDK21-14MM-3/8"-A
      As low as $98.31 $144.19
      Ruland DCDK21-14MM-3/8"-A, 14mm x 3/8" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    5. Ruland DCDK21-14MM-5/16"-A, Double Disc Coupling
      DCDK21-14MM-5/16"-A
      As low as $98.31 $144.19
      Ruland DCDK21-14MM-5/16"-A, 14mm x 5/16" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    6. Ruland DCDK21-15MM-1/2"-A, Double Disc Coupling
      DCDK21-15MM-1/2"-A
      As low as $98.31 $144.19
      Ruland DCDK21-15MM-1/2"-A, 15mm x 1/2" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    7. Ruland DCDK21-15MM-3/8"-A, Double Disc Coupling
      DCDK21-15MM-3/8"-A
      As low as $98.31 $144.19
      Ruland DCDK21-15MM-3/8"-A, 15mm x 3/8" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    8. Ruland DCDK21-15MM-5/16"-A, Double Disc Coupling
      DCDK21-15MM-5/16"-A
      As low as $98.31 $144.19
      Ruland DCDK21-15MM-5/16"-A, 15mm x 5/16" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    9. Ruland DCDK21-16MM-1/2"-A, Double Disc Coupling
      DCDK21-16MM-1/2"-A
      As low as $98.31 $144.19
      Ruland DCDK21-16MM-1/2"-A, 16mm x 1/2" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    10. Ruland DCDK21-16MM-3/8"-A, Double Disc Coupling
      DCDK21-16MM-3/8"-A
      As low as $98.31 $144.19
      Ruland DCDK21-16MM-3/8"-A, 16mm x 3/8" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    11. Ruland DCDK21-16MM-5/16"-A, Double Disc Coupling
      DCDK21-16MM-5/16"-A
      As low as $98.31 $144.19
      Ruland DCDK21-16MM-5/16"-A, 16mm x 5/16" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    12. Ruland DCDK21-16MM-5/8"-A, Double Disc Coupling
      DCDK21-16MM-5/8"-A
      As low as $98.31 $144.19
      Ruland DCDK21-16MM-5/8"-A, 16mm x 5/8" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    13. Ruland DCDK21-3/8"-8MM-A, Double Disc Coupling
      DCDK21-3/8"-8MM-A
      As low as $98.31 $144.19
      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
      Add to Compare
    14. Ruland DCDK21-3/8"-9MM-A, Double Disc Coupling
      DCDK21-3/8"-9MM-A
      As low as $98.31 $144.19
      Ruland DCDK21-3/8"-9MM-A, 3/8" x 9mm Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    15. Ruland DCDK21-5/8"-10MM-A, Double Disc Coupling
      DCDK21-5/8"-10MM-A
      As low as $98.31 $144.19
      Ruland DCDK21-5/8"-10MM-A, 5/8" x 10mm Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    16. Ruland DCDK21-5/8"-11MM-A, Double Disc Coupling
      DCDK21-5/8"-11MM-A
      As low as $98.31 $144.19
      Ruland DCDK21-5/8"-11MM-A, 5/8" x 11mm Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    17. Ruland DCDK21-5/8"-12MM-A, Double Disc Coupling
      DCDK21-5/8"-12MM-A
      As low as $98.31 $144.19
      Ruland DCDK21-5/8"-12MM-A, 5/8" x 12mm Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    18. Ruland DCDK21-5/8"-13MM-A, Double Disc Coupling
      DCDK21-5/8"-13MM-A
      As low as $98.31 $144.19
      Ruland DCDK21-5/8"-13MM-A, 5/8" x 13mm Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    19. Ruland DCDK21-5/8"-14MM-A, Double Disc Coupling
      DCDK21-5/8"-14MM-A
      As low as $98.31 $144.19
      Ruland DCDK21-5/8"-14MM-A, 5/8" x 14mm Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    20. Ruland DCDK21-5/8"-15MM-A, Double Disc Coupling
      DCDK21-5/8"-15MM-A
      As low as $98.31 $144.19
      Ruland DCDK21-5/8"-15MM-A, 5/8" x 15mm Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    21. Ruland DCDK21-5/8"-8MM-A, Double Disc Coupling
      DCDK21-5/8"-8MM-A
      As low as $98.31 $144.19
      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
      Add to Compare
    22. Ruland DCDK21-5/8"-9MM-A, Double Disc Coupling
      DCDK21-5/8"-9MM-A
      As low as $98.31 $144.19
      Ruland DCDK21-5/8"-9MM-A, 5/8" x 9mm Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" (33.3mm) OD, 1.770" (45.0mm) Length
      Add to Compare
    23. Ruland DCDK21-6-5-A, Double Disc Coupling
      DCDK21-6-5-A
      As low as $98.31 $144.19
      Ruland DCDK21-6-5-A, 3/8" x 5/16" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" OD, 1.770" Length
      Add to Compare
    24. Ruland DCDK21-6-6-A, Double Disc Coupling
      DCDK21-6-6-A
      As low as $98.31 $144.19
      Ruland DCDK21-6-6-A, 3/8" x 3/8" Double Disc Coupling, Aluminum, Clamp Style With Keyway, 1.313" OD, 1.770" Length
      Add to Compare
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    Bore Type
    Unit of Measurement
    1. Inch 266 items
    2. Inch/Metric 786 items
    3. Metric 837 items
    Bore (B1)
    1. 0.1250 in 2 items
    2. 0.1875 in 6 items
    3. 0.2500 in 14 items
    4. 0.3125 in 12 items
    5. 0.3750 in 24 items
    6. 0.5000 in 54 items
    7. 0.6250 in 62 items
    8. 0.7500 in 70 items
    9. 0.8750 in 60 items
    10. 1.0000 in 82 items
    11. 1.1250 in 60 items
    12. 1.2500 in 72 items
    13. 1.3750 in 42 items
    14. 1.5000 in 54 items
    15. 1.6250 in 26 items
    16. 1.7500 in 30 items
    17. 3 mm 1 item
    18. 4 mm 4 items
    19. 5 mm 8 items
    20. 6 mm 11 items
    21. 7 mm 11 items
    22. 8 mm 22 items
    23. 9 mm 17 items
    24. 10 mm 30 items
    25. 11 mm 36 items
    26. 12 mm 44 items
    27. 13 mm 32 items
    28. 14 mm 46 items
    29. 15 mm 54 items
    30. 16 mm 70 items
    31. 17 mm 50 items
    32. 18 mm 56 items
    33. 19 mm 62 items
    34. 20 mm 78 items
    35. 22 mm 54 items
    36. 24 mm 66 items
    37. 25 mm 74 items
    38. 28 mm 54 items
    39. 30 mm 66 items
    40. 32 mm 58 items
    41. 35 mm 46 items
    42. 38 mm 50 items
    43. 40 mm 24 items
    44. 42 mm 28 items
    45. 45 mm 32 items
    46. 3/2.5D mm 1 item
    47. 4/3.5D mm 2 items
    48. 5/4.5D mm 4 items
    49. 6/5.5D mm 7 items
    50. 7/6.5D mm 5 items
    51. 8/7.5D mm 7 items
    52. 9/8.5D mm 4 items
    53. 10/9.5D mm 5 items
    Small Bore (B2)
    1. 0.1250 in 6 items
    2. 0.1875 in 11 items
    3. 0.2500 in 22 items
    4. 0.3125 in 42 items
    5. 0.3750 in 60 items
    6. 0.5000 in 107 items
    7. 0.6250 in 75 items
    8. 0.7500 in 73 items
    9. 0.8750 in 51 items
    10. 1.0000 in 63 items
    11. 1.1250 in 49 items
    12. 1.2500 in 37 items
    13. 1.3750 in 26 items
    14. 1.5000 in 14 items
    15. 1.6250 in 8 items
    16. 1.7500 in 4 items
    17. 3 mm 7 items
    18. 4 mm 13 items
    19. 5 mm 9 items
    20. 6 mm 26 items
    21. 7 mm 20 items
    22. 8 mm 39 items
    23. 9 mm 33 items
    24. 10 mm 54 items
    25. 11 mm 48 items
    26. 12 mm 74 items
    27. 13 mm 58 items
    28. 14 mm 91 items
    29. 15 mm 82 items
    30. 16 mm 68 items
    31. 17 mm 59 items
    32. 18 mm 53 items
    33. 19 mm 47 items
    34. 20 mm 65 items
    35. 22 mm 57 items
    36. 24 mm 45 items
    37. 25 mm 71 items
    38. 28 mm 55 items
    39. 30 mm 43 items
    40. 32 mm 31 items
    41. 35 mm 22 items
    42. 38 mm 18 items
    43. 40 mm 10 items
    44. 42 mm 6 items
    45. 45 mm 2 items
    46. 3/2.5D mm 4 items
    47. 4/3.5D mm 3 items
    48. 5/4.5D mm 6 items
    49. 6/5.5D mm 9 items
    50. 7/6.5D mm 6 items
    51. 8/7.5D mm 4 items
    52. 9/8.5D mm 2 items
    53. 10/9.5D mm 1 item
    Keyway
    1. No 1008 items
    2. Yes 881 items
    Outer Diameter (OD)
    1. 0.590 in (15.0 mm) 38 items
    2. 0.750 in (19.1 mm) 46 items
    3. 1.000 in (25.4 mm) 138 items
    4. 1.313 in (33.3 mm) 181 items
    5. 1.625 in (41.3 mm) 240 items
    6. 2.000 in (50.8 mm) 302 items
    7. 2.250 in (57.2 mm) 400 items
    8. 2.750 in (69.9 mm) 272 items
    9. 3.125 in (79.4 mm) 272 items
    Length (L)
    1. 0.937 in (23.8 mm) 38 items
    2. 1.189 in (30.2 mm) 46 items
    3. 1.374 in (34.9 mm) 138 items
    4. 1.770 in (45.0 mm) 181 items
    5. 2.165 in (55.0 mm) 240 items
    6. 2.519 in (64.0 mm) 302 items
    7. 3.080 in (78.2 mm) 400 items
    8. 3.531 in (89.7 mm) 272 items
    9. 3.938 in (100.0 mm) 272 items
    Static Torque
    1. 1.7 Nm 20 items
    2. 2.8 Nm 25 items
    3. 5.6 Nm 69 items
    4. 11.3 Nm 90 items
    5. 20.3 Nm 132 items
    6. 39.6 Nm 152 items
    7. 50.9 Nm 169 items
    8. 96.03 Nm 90 items
    9. 129.93 Nm 90 items
    10. 15 lb-in 6 items
    11. 25 lb-in 6 items
    12. 50 lb-in 17 items
    13. 100 lb-in 19 items
    14. 180 lb-in 20 items
    15. 350 lb-in 30 items
    16. 450 lb-in 56 items
    17. 850 lb-in 56 items
    18. 1150 lb-in 56 items
    19. 15 lb-in (1.7 Nm) 12 items
    20. 25 lb-in (2.8 Nm) 15 items
    21. 50 lb-in (5.6 Nm) 52 items
    22. 100 lb-in (11.3 Nm) 72 items
    23. 180 lb-in (20.3 Nm) 88 items
    24. 350 lb-in (39.6 Nm) 120 items
    25. 450 lb-in (50.9 Nm) 175 items
    26. 850 lb-in (96.03 Nm) 126 items
    27. 1150 lb-in (129.93 Nm) 126 items
    Angular Misalignment
    1. 1.0° 38 items
    2. 2.0° 1851 items
    Parallel Misalignment
    1. 0.002 in 6 items
    2. 0.004 in 6 items
    3. 0.006 in 17 items
    4. 0.008 in 19 items
    5. 0.010 in 20 items
    6. 0.012 in 198 items
    7. 0.002 in (0.05 mm) 12 items
    8. 0.004 in (0.10 mm) 15 items
    9. 0.006 in (0.15 mm) 52 items
    10. 0.008 in (0.20 mm) 72 items
    11. 0.010 in (0.25 mm) 88 items
    12. 0.012 in (0.30 mm) 547 items
    13. 0.05 mm 20 items
    14. 0.10 mm 25 items
    15. 0.15 mm 69 items
    16. 0.20 mm 90 items
    17. 0.25 mm 132 items
    18. 0.30 mm 501 items
    Axial Motion
    1. 0.004 in 6 items
    2. 0.008 in 6 items
    3. 0.012 in 17 items
    4. 0.016 in 19 items
    5. 0.020 in 20 items
    6. 0.025 in 30 items
    7. 0.030 in 168 items
    8. 0.004 in (0.10 mm) 12 items
    9. 0.008 in (0.20 mm) 15 items
    10. 0.012 in (0.30 mm) 52 items
    11. 0.016 in (0.40 mm) 72 items
    12. 0.020 in (0.51 mm) 88 items
    13. 0.025 in (0.64 mm) 120 items
    14. 0.030 in (0.76 mm) 427 items
    15. 0.10 mm 20 items
    16. 0.20 mm 25 items
    17. 0.30 mm 69 items
    18. 0.40 mm 90 items
    19. 0.51 mm 132 items
    20. 0.64 mm 152 items
    21. 0.76 mm 349 items
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