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.)

SOH Series Go to SOH Series(Index)

Oldham Coupling_Polyacetal(POM)/ General

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

Side-clamp

Dimensions / Performance

SOH-C

Model CAD Size (±0.3mm) Screw Rated
Torque
(N·m) 		Max.
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 L L1 L3 F Size Fastening
Torque
(N·m)		 Angular
(˚)		 Parallel
(mm)		 End-
play
(mm)
SOH-16C 16 23.9 7.7 – 2.7 M2.6 1 1 2 13,000 3.1×10-7 65 8.5 1.5 1 0.1 X
SOH-20C 20 25.7 8 – 2.8 M2.6 1 1.5 3 11,000 8.2×10-7 120 14.2 1.5 1.5 0.1 X
SOH-25C 25.5 32 10.2 – 3.5 M3 1.7 2.5 5 10,000 2.7×10-6 200 29.3 1.5 2 0.1 X
SOH-32C 32 44.7 14.4 – 4.9 M4 3.5 7 14 9,000 9.2×10-6 620 59.6 1.5 2.5 0.15 X
SOH-43C 43 52 16.5 – 5.8 M5 8 12.5 25 8,000 3.4×10-5 1,200 127 1.5 3 0.15 X
SOH-53C 53 58.3 19.5 – 6.3 M5 8 20 40 7,000 9.1×10-5 1,400 217 1.5 3.2 0.2 X
SOH-57C 57 76.2 26.9 – 7.7 M6 13 34 68 6,000 1.6×10-4 2,600 329 1.5 3.5 0.2 X
SOH-70C 73 81.5 28 20 10 M8 30 65 130 4,500 5.4×10-4 5,000 670 1.5 3.5 0.3 ○
SOH-90C 88 97 33.5 25 12 M10 50 105 210 4,500 1.2×10-3 7,500 1,240 1.5 4 0.35 ○
SOH-120C 118 138 40.5 26.5 13 M12 90 200 400 3,500 6.5×10-3 14,000 2,600 1.5 4.5 0.4 ○
  • The Moment of Inertia and Mass values are based on products with max. Inner diameter.
  • Please modify rated/max. torque value with temperature correction factor when it’s higher than 30°C.
  • Max. torque/rated 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.

SOH-SC (Combination)

Model CAD Size (±0.3mm) Screw Rated
Torque
(N·m)		 Max.
Torque
(N·m)		 Max.
rpm
(min-1)		 Moment
of
Inertia
(kg·m2)		 Static
Torsional
Stiffness
(N·m/rad)		 Mass
(g)		 Permissible Misalignment
D L L1 L2 F1 F2 Size
(M1)		 Fastening
Torque
(N·m)		 Size
(M2)		 Fastening
Torque
(N·m)		 Angular
(˚)		 Parallel
(mm)		 End-
play
(mm)
SOH-16SC 16 20.9 4.7 7.7 2.2 2.7 M3 0.7 M2.6 1 1 2 13,000 2.9×10-7 65 7.5 1.5 1 0.1
SOH-20SC 20 22.8 5.1 8 2.4 2.8 M4 1.7 M2.6 1 1.5 3 11,000 7.2×10-7 120 12.6 1.5 1.5 0.1
SOH-25SC 25.5 28.7 6.9 10.2 3.1 3.5 M4 1.7 M3 1.7 2.5 5 10,000 2.6×10-6 200 26 1.5 2 0.1
SOH-32SC 32 38.3 8 14.4 3.8 4.9 M5 4 M4 3.5 7 14 9,000 7.8×10-6 620 50.3 1.5 2.5 0.2
  • The Moment of Inertia and Mass values are based on products with max. Inner diameter.
  • Please modify rated/max. torque value with temperature correction factor when it’s higher than 30°C.
  • Max. torque/rated 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.
  • The values about Screw (size and fastening torque) are stated in left-to-right order. (S/C=Set-screw/Side-clamp)
Standard Inner Diameter (ID)
Model Standard Inner Diameter (d1, d2) (mm)
3 4 5 6 6.35 8 9 9.525 10 11 12 14 15 16 18 19 20 22 24 25 25.4 28
SOH-16□□ ● ● ● ●
SOH-20□□ ● ● ● ● ●
SOH-25□□ ● ● ● ● ● ● ●
SOH-32□□ ● ● ● ● ● ● ● ● ● ●
SOH-43□□ ● ● ● ● ● ● ● ● ● ● ●
SOH-53□□ ● ● ● ● ● ● ● ● ● ● ● ●
SOH-57□□ ● ● ● ● ● ● ● ● ● ●
Model Standard Inner Diameter (d1, d2) (mm)
15 16 18 19 20 22 24 25 25.4 28 30 32 35 40 42 45 50 55 60
SOH-70□□ ● ● ● ● ● ● ● ● ● ● ● ● ● ●
SOH-90□□ ● ● ● ● ● ● ● ● ● ● ● ● ●
SOH-120□□ ● ● ● ● ● ● ● ● ● ● ● ●
  • 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)
Slip Torque
  • The below table shows the actual permissible torque values when the slip torque value is lower than the coupling’s max. torque value.
  • If the slip torque value is lower than the coupling’s max. 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 Max.
Torque
(N·m)		 Slip Torque (N·m) by Inner Diameter (d1, d2)
3 4 5 6 6.35 8 9.525 10 11 12 14 15 16 18 19 20
SOH-16C 2 0.5 1
SOH-20C 3 1 2.9
SOH-25C 5 3 4.5
SOH-32C 14 5.5 6.5 8 10 11 12
SOH-43C 25 22
SOH-53C 40 25 30
SOH-57C 68 42 55 65
Model Max.
Torque
(N·m)		 Slip Torque (N·m) by Inner Diameter (d1, d2)
15 16 18 19 20 22 24 25 28 30 35 40 42 45 50
SOH-70C 130
SOH-90C 210 150 180
SOH-120C 400 200 250 275 300 320 330 350 380