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_Stainless Steel Body

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

Side-clamp

Dimensions / Performance
Model CAD 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 Side-
clamp
Hub
Split (W)
D D1 L L1 L3 F Size Fastening
Torque
(N·m)		 Angular
(˚)		 Parallel
(mm)		 End-
play
(mm)
SDWAS-16C 16 6.3 21.2 7.8 – 2.5 M2 0.5 0.6 14,000 7.9 x 10-7 200 22.4 1 0.05 ±0.2 X
SDWBS-16C 16 6.3 23.2 7.8 – 2.5 M2 0.5 0.6 14,000 8.6 x 10-7 200 24.3 1 0.05 ±0.2 X
SDWAS-19C 19 8.4 23.3 8.7 – 2.9 M2.6 1 0.9 14,000 1.6 x 10-6 300 37 1 0.05 ±0.2 X
SDWBS-19C 19 8.4 26.3 8.7 – 2.9 M2.6 1 0.9 14,000 2.0 x 10-6 300 39 1 0.05 ±0.2 X
SDWAS-22C 22.2 9 25 8.7 – 2.8 M2.6 1 1.2 10,000 3.3 x 10-6 400 47 1.5 0.12 ±0.2 X
SDWBS-22C 22.2 9 27.2 8.7 – 2.8 M2.6 1 1.2 10,000 3.5 x 10-6 400 50 1.5 0.12 ±0.2 X
SDWAS-26C 26.6 12.2 32.5 10.6 – 3.4 M3 1.5 2.2 10,000 8.5 x 10-6 600 92 1.5 0.15 ±0.3 X
SDWAS-31C 31.8 14.4 33.5 11.6 – 3.7 M3 1.5 4 8,000 1.9 x 10-5 1,300 140 1.5 0.15 ±0.4 X
SDWBS-31C 31.8 14.4 38.5 11.6 – 3.7 M3 1.5 4 8,000 2.2 x 10-5 1,300 162 1.5 0.15 ±0.4 X
SDWAS-35C 35 16.2 34.6 12.7 – 4.4 M4 2.5 5 8,000 3.0 x 10-5 1,500 165 1.5 0.16 ±0.4 X
SDWCS-35C 35 16.2 38.1 12.7 – 4.4 M4 2.5 5 8,000 3.4 x 10-5 1,500 198 1.5 0.16 ±0.4 X
SDWAS-39C 39 17 39.5 13.7 – 4.3 M4 2.5 6 8,000 5.3 x 10-5 1,800 257 1.5 0.18 ±0.4 X
SDWAS-39C(3) 39 17 40.1 13.7 – 4.3 M4 2.5 9 8,000 5.3 x 10-5 1,800 257 1.5 0.18 ±0.4 X
SDWCS-39C 39 17 45 13.7 – 4.3 M4 2.5 6 8,000 6.0 x 10-5 1,800 297 1.5 0.18 ±0.4 X
SDWCS-39C(3) 39 17 45.6 13.7 – 4.3 M4 2.5 9 8,000 6.0 x 10-5 1,800 297 1.5 0.18 ±0.4 X
SDWCS-42C 42.5 18 46.2 13.7 – 4.3 M4 2.5 8 8,000 8.3 x 10-5 2,000 324 1.5 0.18 ±0.5 X
SDWCS-42C(3) 42.5 18 46.8 13.7 – 4.3 M4 2.5 10 8,000 8.3 x 10-5 2,000 324 1.5 0.18 ±0.5 X
SDWCS-47C 47 20.5 50 16 – 5.2 M4 2.5 14 7,500 1.4 x 10-4 4,000 432 1.5 0.2 ±0.5 X
SDWBS-54C 54 25 52.6 19 13 6.3 M5 4 25 7,500 2.8 x 10-4 7,000 675 1.5 0.2 ±0.5 ○
SDWCS-54C 54 25 58.6 19 13 6.3 M5 4 25 7,500 3.0 x 10-4 7,000 756 1.5 0.2 ±0.5 ○
SDWAS-64C 64 25.8 74.4 26 15.2 7.5 M6 8 40 6,500 6.8 x 10-4 11,000 1,200 1.5 0.3 ±0.5 ○
SDWS-80C 80 35.8 81.8 29.7 19 9.4 M8 20 85 6,000 1.9 x 10-3 20,000 2,020 2 0.4 ±0.6 ○
SDWCS-80C 80 35.8 98.3 29.7 19 9.4 M8 20 85 6,000 2.4 x 10-3 20,000 2,490 2 0.5 ±0.6 ○
SDWS-90C 94.5 41.6 98.9 30.4 19 9.3 M8 20 180 6,000 4.5 x 10-3 35,000 3,320 2 0.4 ±0.8 ○
  • The Moment of Inertia and Mass values are based on products with max. Inner diameter.
  • 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.
  • Specially-designed split hubs are used for the size of 80C & 90C. (with 2 screws)
Standard Inner Diameter (ID) (16C ~ 47C)
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
SDW□S-16C ● ● ● ●
SDW□S-19C ● ● ● ●
SDW□S-22C ● ● ● ● ● ● ● ●★ ●★
SDW□S-26C ● ● ● ● ● ● ● ●
SDW□S-31C ● ● ● ● ● ● ● ● ● ● ●★ ●★
SDW□S-35C ● ● ● ● ● ● ● ● ● ● ● ● ●★ ●★
SDW□S-39C ● ● ● ● ● ● ● ● ● ● ●
SDW□S-42C ● ● ● ● ● ● ● ● ● ● ● ● ●★ ●★
SDW□S-47C ● ● ● ● ● ● ● ● ● ● ● ●★
  • 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.
Standard Inner Diameter (ID) (54C ~ 90C)
Model Standard Inner Diameter (d1, d2) (mm)
10 11 12 12.7 14 15 15.875 16 17 18 19 20 22 24 25 26 28 30 32 35 40 45
SDW□S-54C ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●★
SDW□S-64C ● ● ● ● ● ● ● ● ● ● ● ● ●★ ●★ ●★ ●★ ●★
SDW□S-80C ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●★
SDW□S-90C ● ● ● ● ● ● ● ● ● ● ●★
  • 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.
  • Side-clamp Hub Split is available (Optional)
Slip Torque
  • The below table shows the actual permissible torque values when the slip torque value is lower than the coupling’s permissible torque value.
  • If the slip torque value is lower than the coupling’s permissible torque value, please check and compare between the slip torque in the below table and the operating torque value of the connected motor. It is safer to size up the coupling or use a key/keyway when the slip torque value is lower than the motor’s operating torque.
  • The below slip torque values may be subject to change according to different testing conditions. (e.g. shaft tolerance, surface roughness, surface treatment or acceleration/deceleration of driving shafts). On the other hand, the values could be affected when a different kind of fastening screw is used (body material or surface treatment). Therefore, we recommend you test under the same conditions before mounting.
  • The bigger sizes (OD ≥ 54) are recommended to have key/keyway in order to clamp the shaft firmly.
Model Permissible
Torque
(N·m)		 Slip Torque (N·m) by Inner Diameter (d1, d2)
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
SDW□S-16C 0.6 0.6
SDW□S-19C 0.9 0.8
SDW□S-22C 1.2 0.8 1.2 1.2
SDW□S-26C 2.2 1.6 1.6 2 2
SDW□S-31C 4 1.3 1.4 2.5 2.7 3 3 3.5 4
SDW□S-35C 5 1 1 1.6 2.2 3 3 4 5
SDW□S-39C 6 3 3.5 3.5 3.8 4.2 5.5 6.4 8 9
SDW□S-39C(3) 9
SDW□S-42C 8 3.2 4 4.2 3 4.8 6 7 9.5 10 10
SDW□S-42C(3) 10
SDW□S-47C 14 3 4.9 6 6 8 8 9 9 9 14 14