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 (Spacer-saving)

Dimensions / Performance
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 F Size Fastening
Torque
(N·m)		 Angular
(˚)		 Parallel
(mm)		 End-
play
(mm)
SOHM-12C 11.9 16.5 5 2.5 M2 0.5 0.9 1.8 15,000 7.4 x 10-8 55 3.5 1.5 1 0.05
SOHM-16C 16 20.7 6.1 3 M2.6 1 1 2 13,000 2.6×10-7 65 7.4 1.5 1 0.1
SOHM-20C 20 21.9 6.1 2.9 M2.6 1 1.5 3 11,000 6.8×10-7 120 12 1.5 1.5 0.1
SOHM-25C 25.5 26.4 7.4 3.7 M3 1.7 2.5 5 10,000 2.2×10-6 200 23 1.5 2 0.1
SOHM-32C 32 34.9 9.5 4.7 M4 3.5 7 14 9,000 6.8×10-6 620 44 1.5 2.5 0.2
SOHM-43C 43 47 14 7 M5 8 12.5 25 8,000 3.0×10-5 1,200 114 1.5 3 0.15
SOHM-53C 53 53.1 16.9 8.3 M5 8 20 40 7,400 8.3×10-5 1,400 197 1.5 3.2 0.15
SOHM-57C 57 56.8 17.2 8.5 M6 13 34 68 6,000 1.2×10-4 2,600 232 1.5 3.5 0.2
SOHM-70C 73 75.5 25 12.3 M8 30 65 130 4,500 4.5×10-4 5,000 547 1.5 3.5 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.
Standard Inner Diameter (ID)
Model Standard Inner Diameter (d1, d2) (mm)
3 4 4.5 5 6 6.35 8 9 9.525 10 11 12 14 15 16 18 19 20 22 24 25 25.4 28 30 32 35
SOHM-12C ● ● ● ●
SOHM-16C ● ● ● ●
SOHM-20C ● ● ● ● ●
SOHM-25C ● ● ● ● ● ● ●
SOHM-32C ● ● ● ● ● ● ● ● ● ●
SOHM-43C ● ● ● ● ● ● ● ● ● ● ●
SOHM-53C ● ● ● ● ● ● ● ● ● ● ● ●
SOHM-57C ● ● ● ● ● ● ● ● ● ●
SOHM-70C ● ● ● ● ● ● ● ● ● ● ● ● ●
  • 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 4.5 5 6 6.35 8 9.525 10 11 12 14 15 16 18 19 20 22
SOHM-12C 1.8 0.5 0.6 1 1.2
SOHM-16C 2 0.6 0.6
SOHM-20C 3 1 2.7
SOHM-25C 5 3 4 4.5
SOHM-32C 14 5 5.5 7.5 9 10 11
SOHM-43C 25 24
SOHM-53C 40 30 35
SOHM-57C 68 50 55
SOHM-70C 130 110 115