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)

Single Disk Type Coupling_High Strength Aluminum Alloy Body

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

Side-clamp – Cylinder-shaped

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
D D1 L L1 L3 F Size Fastening
Torque
(N·m)		 Angular
(˚)		 Parallel
(mm)		 End-
play
(mm)
SDS-12C 12 5.5 12.3 5.9 – 1.9 M1.6 0.25 0.2 14,000 6.9×10-8 170 3 0.5 0.01 ±0.04 X
SDS-16C 16 6.7 17.4 7.8 – 2.5 M2 0.5 0.6 14,000 2.6×10-7 270 7 1 0.02 ±0.1 X
SDS-19C 19 8.5 19.3 8.7 – 2.9 M2.6 1 0.9 14,000 4.0×10-7 500 8 1 0.02 ±0.1 X
SDS-22C 22.2 10 19.7 8.7 – 2.8 M2.6 1 1.2 10,000 1.0×10-6 600 15 1 0.02 ±0.1 X
SDS-26C 26.6 12.2 24.1 10.6 – 3.4 M3 1.7 2.2 10,000 2.4×10-6 900 25 1 0.02 ±0.15 X
SDS-31C 31.8 14.4 26.4 11.6 – 3.7 M3 1.7 4 9,000 5.8×10-6 1,700 40 1 0.02 ±0.2 X
SDCS-35C 35 16.2 28 12.7 – 4.4 M4 3.5 5 8,500 1.0×10-5 2,000 57 1 0.02 ±0.2 X
SDS-39C 39 17 31.3 13.7 – 4.3 M4 3.5 6 8,000 1.6×10-5 2,300 70 1 0.02 ±0.25 X
SDS-39C(3) 39 17 31.6 13.7 – 4.3 M4 3.5 9 8,000 1.6×10-5 2,300 70 1 0.02 ±0.25 X
SDCS-42C 42.5 18 31.4 13.7 – 4.3 M4 3.5 8 8,000 3.4×10-5 2,800 95 1 0.02 ±0.25 X
SDCS-42C(3) 42.5 18 31.7 13.7 – 4.3 M4 3.5 10 8,000 3.4×10-5 2,800 95 1 0.02 ±0.25 X
SDCS-47C 47 20.5 35.6 16 – 5.2 M4 3.5 14 7,500 5.4×10-5 6,000 140 1 0.02 ±0.25 X
SDCS-54C 54 25 42.3 19 13 6.3 M5 8 25 7,500 9.8×10-5 11,000 200 1 0.02 ±0.25 ○
SDCS-64C 64 25.8 58.2 26 15.2 7.5 M6 13 40 7,000 2.2×10-4 20,000 355 1 0.02 ±0.25 ○
SDS-80C 80 35.8 66.1 29.7 19 9.4 M8 30 85 7,000 6.4×10-4 40,000 690 1 0.02 ±0.4 ○
SDS-90C 94.5 41.6 68.9 30.4 19 9.3 M8 30 180 6,000 1.3×10-3 60,000 960 1 0.02 ±0.5 ○
SDS-100C 104.5 47.7 71.7 30.7 19 9.3 M8 30 250 6,000 2.2×10-3 70,000 1,300 1 0.02 ±0.6 ○
  • 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 and 100C. (with 2 screws)
Standard Inner Diameter (ID) (12C~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
SDS-12C ● ● ●★
SDS-16C ● ● ● ●
SDS-19C ● ● ● ● ●
SDS-22C ● ● ● ● ● ● ● ● ● ●★
SDS-26C ● ● ● ● ● ● ● ● ● ●
SDS-31C ● ● ● ● ● ● ● ● ● ● ● ●★ ●★
SDCS-35C ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●★
SDS-39C ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
SDCS-42C ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●★ ●★
SDCS-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. – ※ Exception Item: SDS-12C
  • 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 ~ 100C)
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 50
SDCS-54C ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●★
SDCS-64C ● ● ● ● ● ● ● ● ● ● ● ● ●★ ●★ ●★ ●★ ●★
SDS-80C ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●★
SDS-90C ● ● ● ● ● ● ● ● ● ● ●★
SDS-100C ● ● ● ● ● ● ● ● ● ● ● ●★
  • 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.
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
SDS-16C 0.6 0.6
SDS-19C 0.9
SDS-22C 1.2 1.1
SDS-26C 2.2 2 2
SDS-31C 4 3
SDCS-35C 5 5
SDS-39C 6 5.5 6 6.5 7 9
SDS-39C(3) 9
SDCS-42C 8 4.5 6 8 10
SDS-42C(3) 10
SDCS-47C 14 10 11 12 14
Model Permissible
Torque
(N·m)		 Slip Torque (N.m) by Inner Diameter (d1, d2)
10 11 12 12.7 14 15 16 18 19 20 22 24 25 28 30 32 35 40 45 50
SDCS-54C 25
SDCS-64C 40 40
SDS-80C 85
SDS-90C 180 100 110 130 150
SDS-100C 250 136 140 144 152 180 185 192 216 230 240 250

Side-clamp – Flange-shaped (Low-inertia)

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
D D1 D2 L L1 F Size Fastening
Torque
(N·m)		 Angular
(˚)		 Parallel
(mm)		 End
-play
(mm)
SDS-35C 35 16.2 21.5 28 12.7 3.9 M3 1.7 5 8,500 4.6×10-6 2,000 35 1 0.02 ±0.2
SDS-42C 42.5 18 29.3 30.8 13.4 3.8 M3 1.7 8 8,000 1.7×10-5 2,800 65 1 0.02 ±0.25
SDS-42C(3) 42.5 18 29.3 31.1 13.4 3.8 M3 1.7 10 8,000 1.7×10-5 2,800 65 1 0.02 ±0.25
SDS-47C 47 20.5 33/*38 37 16.7 5 M4 3.5 14 8,000 3.2×10-5 6,000 108 1 0.02 ±0.25
SDS-54C 54 25 38.5 47.1 21.4 6.1 M5 8 25 8,000 5.5×10-5 11,000 145 1 0.02 ±0.25
SDS-64C 64 25.8 48 58.2 26 7.5 M6 13 40 7,000 1.8×10-4 20,000 292 1 0.02 ±0.25
  • 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.
  • For OD 47C products, please refer to D2 values with * mark when inner diameters are bigger than 18mm.
Standard Inner Diameter (ID)
Model Standard Inner Diameter (d1, d2) (mm)
5 6 6.35 7 8 9 9.525 10 11 12 12.7 14 15 15.875 16 17 18 19 20 22 24 25
SDS-35C ● ● ● ● ● ● ● ●
SDS-42C ● ● ● ● ● ● ● ● ● ● ● ●
SDS-47C ● ● ● ● ● ● ● ● ● ● ● ● ● ●
SDS-54C ● ● ● ● ● ● ● ● ● ● ● ●
SDS-64C ● ● ● ● ● ● ● ● ● ● ● ● ●★
  • 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.
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 different kind of fastening screw is used. Therefore, we recommend you test under the same conditions before mounting.
Model Permissible
Torque
(N·m)		 Slip Torque (N.m) by Inner Diameter (d1, d2)
5 6 6.35 7 8 9 9.525 10 11 12 12.7 14 15 15.875 16 17 18 19 20 21
SDS-35C 5 3.2 3.5 3.8
SDS-42C 8 3 3 3.5 4 6 7 9 9.5 10
SDS-42C(3) 10
SDS-47C 14 10 11 12 14
SDS-54C 25
SDS-64C 40 36 37