Shaft Coupling

Coupling is a core component that transmits power and motion
from the driving shaft to the driven part while absorbing misalignment
and any possible factors that could reduce efficiency of machines
(e.g. vibration, noise, electric current, etc.)

SD Series Go to SD Series(Index)

Double Disk Type Coupling_High Strength Aluminum Alloy Body

  • SD – 2D (.dwg)
  • SD – 3D (.step)

Set-Screw

Dimensions / Performance (General Type)
Model CAD Shape Size (±0.3mm) Screw Permissible
Torque
(N·m) 		Max.
rpm
(min-1)		 Moment
of
Inertia
(kg·m2) 		Static
Torsional
Stiffness
(N·m/rad) 		Mass
(g)		 Permissible Misalignment
D D1 D2 L L1 F Size Fastening
Torque
(N·m)		 Angular
(˚)		 Parallel
(mm)		 End-
play
(mm)
SDWA-16 Cylinder 16 6.3 – 15.8 5.1 2.5 M2.5 0.5 0.6 16,000 2.2×10-7 200 6 1 0.05 ±0.2
SDWB-16 16 6.3 – 17.8 5.1 2.5 M2.5 0.5 0.6 16,000 2.6×10-7 200 7 1 0.05 ±0.2
SDWA-19 19 8.4 – 18.1 6.1 3 M3 0.7 0.9 16,000 5.3×10-7 300 10 1 0.05 ±0.2
SDWB-19 19 8.4 – 21.1 6.1 3 M3 0.7 0.9 16,000 5.8×10-7 300 11 1 0.05 ±0.2
SDWA-22 22.2 9 – 20.1 6.3 3 M3 0.7 1.2 12,000 1.0×10-6 400 16 1.5 0.12 ±0.2
SDWB-22 22.2 9 – 22.3 6.3 3 M3 0.7 1.2 12,000 1.1×10-6 400 17 1.5 0.12 ±0.2
SDWA-26 26.6 12.2 – 26 7.4 3.6 M4 1.7 2.2 12,000 2.3×10-6 600 28 1.5 0.15 ±0.3
SDWA-31 31.8 14.4 – 24.7 7.2 3.6 M4 1.7 4 10,000 4.3×10-6 1,300 30 1.5 0.15 ±0.4
SDWB-31 31.8 14.4 – 29.7 7.2 3.6 M4 1.7 4 10,000 5.5×10-6 1,300 38 1.5 0.15 ±0.4
SDWA-42 Flange
/Cylinder		 42.5 18 29.3 / – 39.7 / 40.3 13.4 / 13.7 4.6 / 6.5 M4 1.7 8 8,000 2.1×10-5 2,000 84 1.5 0.18 ±0.5
SDWA-42(3) 42.5 18 29.3 / – 40.3 / 40.9 13.4 / 13.7 4.6 / 6.5 M4 1.7 10 8,000 2.1×10-5 2,000 84 1.5 0.18 ±0.5
SDWB-42 42.5 18 29.3 / – 44.2 / 44.8 13.4 / 13.7 4.6 / 6.5 M4 1.7 8 8,000 2.4×10-5 2,000 94 1.5 0.18 ±0.5
SDWB-42(3) 42.5 18 29.3 / – 44.8 / 45.4 13.4 / 13.7 4.6 / 6.5 M4 1.7 10 8,000 2.4×10-5 2,000 94 1.5 0.18 ±0.5
SDWA-47 47 20.4 33 / – 39.9 / 44.2 13.9 / 16 4.5 / 7.1 M5 4 14 8,000 3.4×10-5 4,000 115 1.5 0.2 ±0.5
SDWB-47 47 20.4 33 / – 45.7 / 50 13.9 / 16 4.5 / 7.1 M5 4 14 8,000 3.6×10-5 4,000 120 1.5 0.2 ±0.5
SDWA-54 54 25 38.5 / – 55.8 19 5.8 / 6.4 M5 4 25 7,500 6.7×10-5 7,000 177 1.5 0.2 ±0.5
SDWA-64 64 25.8 48 / – 74.4 26 8 / 11 M8 15 40 7,000 2.2×10-4 11,000 373 1.5 0.3 ±0.5
Dimensions / Performance (Lengthy Middle Body Type)
Model CAD Shape Size (±0.3mm) Screw Permissible
Torque
(N·m) 		Max.
rpm
(min-1)		 Moment
of
Inertia
(kg·m2) 		Static
Torsional
Stiffness
(N·m/rad) 		Mass
(g)		 Permissible Misalignment
D D1 D2 L L1 F Size Fastening
Torque
(N·m)		 Angular
(˚)		 Parallel
(mm)		 End-
play
(mm)
SDA-22 Cylinder 22.2 8.3 – 28.3 6.3 3 M3 0.7 1.2 12,000 1.3×10-6 400 18 1.5 0.12 ±0.2
SDA-26 26.6 10.5 – 31.7 7.4 3.6 M4 1.7 2.2 12,000 3.2×10-6 600 32 1.5 0.15 ±0.3
SDA-31 31.8 12.7 – 36.1 7.2 3.6 M4 1.7 4 10,000 5.5×10-6 1,300 38 1.5 0.15 ±0.4
SDAA-42 Flange
/Cylinder		 42.5 18 29.3 / – 50 / 50.6 13.4 / 13.7 4.6 / 6.5 M4 1.7 8 8,000 2.7×10-5 2,000 105 1.5 0.18 ±0.5
SDAA-42(3) 42.5 18 29.3 / – 50.6 / 51.2 13.4 / 13.7 4.6 / 6.5 M4 1.7 10 8,000 2.7×10-5 2,000 105 1.5 0.18 ±0.5
SDAB-42 42.5 18 29.3 / – 57.9 / 58.5 13.4 / 13.7 4.6 / 6.5 M4 1.7 8 8,000 2.8×10-5 2,000 110 1.5 0.18 ±0.5
SDAB-42(3) 42.5 18 29.3 / – 58.5 / 59.1 13.4 / 13.7 4.6 / 6.5 M4 1.7 10 8,000 2.8×10-5 2,000 110 1.5 0.18 ±0.5
SDAC-42 42.5 18 29.3 / – 67.3 / 67.9 13.4 / 13.7 4.6 / 6.5 M4 1.7 8 8,000 2.9×10-5 2,000 115 1.5 0.18 ±0.5
SDAC-42(3) 42.5 18 29.3 / – 67.9 / 68.5 13.4 / 13.7 4.6 / 6.5 M4 1.7 10 8,000 2.9×10-5 2,000 115 1.5 0.18 ±0.5
SDAA-47 47 20 33 / – 58.1 / 62.4 13.9 / 16 4.5 / 7.1 M5 4 14 8,000 4.2×10-5 4,000 140 1.5 0.2 ±0.5
SDAB-47 47 20 33 / – 85 / 89.3 13.9 / 16 4.5 / 7.1 M5 4 14 8,000 4.7×10-5 4,000 160 1.5 0.2 ±0.5
SDAA-54 54 24.3 38.5 / – 71.2 19 5.8 / 6.4 M5 4 25 7,500 9.0×10-5 7,000 230 1.5 0.2 ±0.5
SDAB-54 54 24.3 38.5 / – 85.1 19 5.8 / 6.4 M5 4 25 7,500 1.1×10-4 7,000 250 1.5 0.2 ±0.5
SDA-64 64 25.8 48 / – 89.9 26 8 / 11 M8 15 40 7,000 2.7×10-4 11,000 450 1.5 0.3 ±0.5
  • The Moment of Inertia and Mass values are based on products with max. Inner diameter.
  • Non-standard lengthy middle body type can be customized.
  • Permissible Torque is the value regarding to a coupling’s self-durability and is not related to slip-torque between the coupling bore and the shaft. (In general, the clamping force on set-screw type is weaker, therefore it is recommended that an additional keyway is processed for the enhanced clamping force.)
  • If the same model has two different shapes (cylinder,flange), please indicate the cylinder type with the identification code ‘D’ after the inner diameter
Standard Inner Diameter (ID)
Model Standard Inner Diameter (d1, d2) (mm)
3 4 4.5 5 6 6.35 7 8 9 9.525 10 11 12 12.7 14 15 15.875 16 17 18 19 20 21 22 24 25 26 28 30
SD□□-16 ● ● ● ●
SD□□-19 ● ● ● ● ●
SD□□-22 ● ● ● ● ● ● ● ● ●★ ●★
SD□□-26 ● ● ● ● ● ● ● ● ● ●
SD□□-31 ● ● ● ● ● ● ● ● ● ● ● ●★ ●★
SD□□-42 ● ● ● ● ● ● ● ● ● ● ● ●
SD□□-47 ● ● ● ● ● ● ● ● ● ● ● ● ● ●
SD□□-54 ● ● ● ● ● ● ● ● ● ● ● ●
SD□□-64 ● ● ● ● ● ● ● ● ● ● ● ● ● ●★ ●★ ●★ ●★
  • The recommended shaft tolerance is h7.
  • Custom process (e.g. non-standard Inner diameter, special tolerance etc.) is also available upon a special request in prior to order placement.
  • Keyway is available. (Optional)
  • Due to interference of the middle parts, make sure the shaft is only inserted into L1 depth for IDs with ★ mark. Consult us first if you’re concerned about misalignment.