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)

Side-clamp – Cylinder-shaped

Dimensions / Performance (General Type)
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)
SDWA-12C 12 5.5 15.7 5.9 – 1.9 M1.6 0.25 0.2 14,000 7.5×10-8 85 4 1 0.03 ±0.08 X
SDWA-16C 16 6.3 21.2 7.8 – 2.5 M2 0.5 0.6 14,000 3.3×10-7 200 9 1 0.05 ±0.2 X
SDWB-16C 16 6.3 23.2 7.8 – 2.5 M2 0.5 0.6 14,000 3.7×10-7 200 10 1 0.05 ±0.2 X
SDWA-19C 19 8.4 23.3 8.7 – 2.9 M2.6 1 0.9 14,000 7.4×10-7 300 14 1 0.05 ±0.2 X
SDWB-19C 19 8.4 26.3 8.7 – 2.9 M2.6 1 0.9 14,000 7.9×10-7 300 15 1 0.05 ±0.2 X
SDWA-22C 22.2 9 25 8.7 – 2.8 M2.6 1 1.2 10,000 1.3×10-6 400 18 1.5 0.12 ±0.2 X
SDWB-22C 22.2 9 27.2 8.7 – 2.8 M2.6 1 1.2 10,000 1.4×10-6 400 19 1.5 0.12 ±0.2 X
SDWA-26C 26.6 12.2 32.5 10.6 – 3.4 M3 1.7 2.2 10,000 3.4×10-6 600 34 1.5 0.15 ±0.3 X
SDWA-31C 31.8 14.4 33.5 11.6 – 3.7 M3 1.7 4 9,000 7.5×10-6 1,300 52 1.5 0.15 ±0.4 X
SDWB-31C 31.8 14.4 38.5 11.6 – 3.7 M3 1.7 4 9,000 8.8×10-6 1,300 60 1.5 0.15 ±0.4 X
SDWA-35C 35 16.2 34.6 12.7 – 4.4 M4 3.5 5 8,500 1.2×10-5 1,500 67 1.5 0.16 ±0.4 X
SDWC-35C 35 16.2 38.1 12.7 – 4.4 M4 3.5 5 8,500 1.4×10-5 1,500 75 1.5 0.16 ±0.4 X
SDWA-39C 39 17 39.5 13.7 – 4.3 M4 3.5 6 8,000 2.1×10-5 1,800 95 1.5 0.18 ±0.4 X
SDWA-39C(3) 39 17 40.1 13.7 – 4.3 M4 3.5 9 8,000 2.1×10-5 1,800 95 1.5 0.18 ±0.4 X
SDWC-39C 39 17 45 13.7 – 4.3 M4 3.5 6 8,000 2.4×10-5 1,800 110 1.5 0.18 ±0.4 X
SDWC-39C(3) 39 17 45.6 13.7 – 4.3 M4 3.5 9 8,000 2.4×10-5 1,800 110 1.5 0.18 ±0.4 X
SDWC-42C 42.5 18 46.2 13.7 – 4.3 M4 3.5 8 8,000 3.3×10-5 2,000 120 1.5 0.18 ±0.5 X
SDWC-42C(3) 42.5 18 46.8 13.7 – 4.3 M4 3.5 10 8,000 3.3×10-5 2,000 120 1.5 0.18 ±0.5 X
SDWC-47C 47 20.5 50 16 – 5.2 M4 3.5 14 7,500 5.5×10-5 4,000 160 1.5 0.2 ±0.5 X
SDWB-54C 54 25 52.6 19 13 6.3 M5 8 25 7,500 1.1×10-4 7,000 250 1.5 0.2 ±0.5 ○
SDWC-54C 54 25 58.6 19 13 6.3 M5 8 25 7,500 1.2×10-4 7,000 280 1.5 0.2 ±0.5 ○
SDWB-64C 64 25.8 74.4 26 15.2 7.5 M6 13 40 6,500 3.5×10-4 11,000 455 1.5 0.3 ±0.5 ○
SDWC-64C 64 25.8 84.4 26 15.2 7.5 M6 13 40 6,500 4.8×10-4 11,000 530 1.5 0.3 ±0.5 ○
SDW-80C 80 35.8 81.8 29.7 19 9.4 M8 30 85 6,000 8.1×10-4 20,000 860 2 0.4 ±0.6 ○
SDWC-80C 80 35.8 98.3 29.7 19 9.4 M8 30 85 6,000 9.7×10-4 20,000 1,020 2 0.5 ±0.6 ○
SDW-90C 94.5 41.6 98.9 30.4 19 9.3 M8 30 180 6,000 1.8×10-3 35,000 1,360 2 0.4 ±0.8 ○
SDW-100C 104.5 47.7 103.8 30.7 19 9.3 M8 30 250 6,000 2.9×10-3 50,000 1,700 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 and 100C. (with 2 screws)
Dimensions / Performance (Lengthy Middle Body Type)
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 F Size Fastening
Torque
(N·m)		 Angular
(˚)		 Parallel
(mm)		 End-
play
(mm)
SDA-22C 22.2 8.3 33.2 8.7 2.8 M2.6 1 1.2 10,000 1.5×10-6 400 20 1.5 0.12 ±0.2 X
SDA-26C 26.6 10.5 38.2 10.6 3.4 M3 1.7 2.2 10,000 3.9×10-6 600 39 1.5 0.15 ±0.3 X
SDA-31C 31.8 12.7 44.9 11.6 3.7 M3 1.7 4 9,000 8.8×10-6 1,300 60 1.5 0.15 ±0.4 X
SDA-39C 39 15.3 56.5 13.7 4.3 M4 3.5 6 8,000 3.0×10-5 1,800 120 1.5 0.18 ±0.4 X
SDA-39C(3) 39 15.3 57.1 13.7 4.3 M4 3.5 9 8,000 3.0×10-5 1,800 120 1.5 0.18 ±0.4 X
  • 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.
Standard Inner Diameter (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
SD□□-12C ● ● ●★
SD□□-16C ● ● ● ●
SD□□-19C ● ● ● ● ●
SD□□-22C ● ● ● ● ● ● ● ● ●★ ●★
SD□□-26C ● ● ● ● ● ● ● ● ● ●
SD□□-31C ● ● ● ● ● ● ● ● ● ● ● ●★ ●★
SD□□-35C ● ● ● ● ● ● ● ● ● ● ● ● ● ●★ ●★
SD□□-39C ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
SD□□-42C ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●★ ●★
SD□□-47C ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●★
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
SD□□-54C ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●★
SD□□-64C ● ● ● ● ● ● ● ● ● ● ● ● ●★ ●★ ●★ ●★ ●★
SD□□-80C ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●★
SD□□-90C ● ● ● ● ● ● ● ● ● ● ●★
SD□□-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. – ※ Exception Item: SDWA-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.
  • 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
SD□□-16C 0.6 0.6
SD□□-19C 0.9
SD□□-22C 1.2 1.1
SD□□-26C 2.2 2 2
SD□□-31C 4 3
SD□□-35C 5 5
SD□□-39C 6 5.5 6 6.5 7 9
SD□□-39C(3) 9
SD□□-42C 8 4.5 6 8 10
SD□□-42C(3) 10
SD□□-47C 14 10 11 12
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
SD□□-54C 25
SD□□-64C 40
SD□□-80C 85
SD□□-90C 180 100 110 130 150
SD□□-100C 250 136 140 144 152 180 185 192 216 230 240 250

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

Dimensions / Performance (General Type)
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)
SDWB-35C 35 16.2 21.5 34.6 12.7 3.9 M3 1.7 5 8,500 6.1×10-6 1,500 44 1.5 0.16 ±0.4
SDWD-35C 35 16.2 21.5 38.1 12.7 3.9 M3 1.7 5 8,500 8.2×10-6 1,500 55 1.5 0.16 ±0.4
SDWA-42C 42.5 18 29.3 39.7 13.4 3.8 M3 1.7 8 8,000 2.1×10-5 2,000 84 1.5 0.18 ±0.5
SDWA-42C(3) 42.5 18 29.3 40.3 13.4 3.8 M3 1.7 10 8,000 2.1×10-5 2,000 84 1.5 0.18 ±0.5
SDWB-42C 42.5 18 29.3 44.2 13.4 3.8 M3 1.7 8 8,000 2.4×10-5 2,000 94 1.5 0.18 ±0.5
SDWB-42C(3) 42.5 18 29.3 44.8 13.4 3.8 M3 1.7 10 8,000 2.4×10-5 2,000 94 1.5 0.18 ±0.5
SDWA-47C 47 20.5 33/*38 45.6 16.7 5 M4 3.5 14 7,500 3.6×10-5 4,000 120 1.5 0.2 ±0.5
SDWB-47C 47 20.5 33/*38 51.4 16.7 5 M4 3.5 14 7,500 3.9×10-5 4,000 132 1.5 0.2 ±0.5
SDWA-54C 54 25 38.5 60.6 21.4 6.1 M5 8 25 7,500 7.2×10-5 7,000 192 1.5 0.2 ±0.5
SDWA-64C 64 25.8 48 74.4 26 7.5 M6 13 40 6,500 2.2×10-4 11,000 373 1.5 0.3 ±0.5
  • 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.
  • Please refer to * marked value for D2 of OD 47 products when ID is over 18mm.
Dimensions / Performance (Lengthy Middle Body Type)
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)
SDAA-42C 42.5 18 29.3 50 13.4 3.8 M3 1.7 8 8,000 2.7×10-5 2,000 105 1.5 0.18 ±0.5
SDAA-42C(3) 42.5 18 29.3 50.6 13.4 3.8 M3 1.7 10 8,000 2.7×10-5 2,000 105 1.5 0.18 ±0.5
SDAB-42C 42.5 18 29.3 57.9 13.4 3.8 M3 1.7 8 8,000 2.8×10-5 2,000 110 1.5 0.18 ±0.5
SDAB-42C(3) 42.5 18 29.3 58.5 13.4 3.8 M3 1.7 10 8,000 2.8×10-5 2,000 110 1.5 0.18 ±0.5
SDAC-42C 42.5 18 29.3 67.3 13.4 3.8 M3 1.7 8 8,000 2.9×10-5 2,000 115 1.5 0.18 ±0.5
SDAC-42C(3) 42.5 18 29.3 67.9 13.4 3.8 M3 1.7 10 8,000 2.9×10-5 2,000 115 1.5 0.18 ±0.5
SDAA-47C 47 20 33/*38 63.8 16.7 5 M4 3.5 14 7,500 4.5×10-5 4,000 152 1.5 0.2 ±0.5
SDAB-47C 47 20 33/*38 90.7 16.7 5 M4 3.5 14 7,500 5.1×10-5 4,000 172 1.5 0.2 ±0.5
SDAA-54C 54 24.3 38.5 76 21.4 6.1 M5 8 25 7,500 9.0×10-5 7,000 240 1.5 0.2 ±0.5
SDAB-54C 54 24.3 38.5 89.9 21.4 6.1 M5 8 25 7,500 1.1×10-4 7,000 266 1.5 0.2 ±0.5
SDA-64C 64 25.8 48 89.9 26 7.5 M6 13 40 6,500 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.
  • Please refer to * marked value for D2 of OD 47 products when ID is over 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
SD□□-35C ● ● ● ● ● ● ● ●
SD□□-42C ● ● ● ● ● ● ● ● ● ● ● ●
SD□□-47C ● ● ● ● ● ● ● ● ● ● ● ● ● ●
SD□□-54C ● ● ● ● ● ● ● ● ● ● ● ●
SD□□-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 operational 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)
5 6 6.35 7 8 9 9.525 10 11 12 12.7 14 15 15.875 16 17 18 19 20 21
SD□□-35C 5 3.2 3.5 3.8
SD□□-42C 8 3 3 3.5 4 6 7 9 9.5 10
SD□□-42C(3) 10
SD□□-47C 14 10 11 12 14
SD□□-54C 25
SD□□-64C 40 36 37