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.)

SJC Series Go to SJC Series(Index)

Jaw Coupling

  • SJC – 2D (.dwg)
  • SJC – 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)
SJCM-55C-BL 55 59.3 20.8 10.1 M6 13 60 120 4,000 1.3×10-4 3,000 280 1 0.09 -0.5 ~ +1.4
SJCM-55C-DG 55 59.3 20.8 10.1 M6 13 60 120 4,000 1.3×10-4 4,500 280 1 0.08 -0.5 ~ +1.4
SJCM-55C-GR 55 59.3 20.8 10.1 M6 13 60 120 4,000 1.3×10-4 4,500 280 1 0.09 -0.5 ~ +1.4
SJCM-55C-RD 55 59.3 20.8 10.1 M6 13 75 150 4,000 1.3×10-4 6,000 280 1 0.06 -0.5 ~ +1.4
SJCM-65C-BL 65 63.3 21.8 10.5 M8 30 150 300 3,500 2.6×10-4 6,500 400 1 0.1 -0.6 ~ +1.5
SJCM-65C-DG 65 63.3 21.8 10.5 M8 30 150 300 3,500 2.6×10-4 8,500 400 1 0.09 -0.6 ~ +1.5
SJCM-65C-GR 65 63.3 21.8 10.5 M8 30 150 300 3,500 2.6×10-4 8,500 400 1 0.1 -0.6 ~ +1.5
SJCM-65C-RD 65 63.3 21.8 10.5 M8 30 180 360 3,500 2.6×10-4 10,000 400 1 0.08 -0.6 ~ +1.5
SJCM-80C-BL 80 87.2 31.7 15.5 M10 50 300 600 3,000 8.7×10-4 8,000 860 1 0.1 -0.6 ~ +1.5
SJCM-80C-DG 80 87.2 31.7 15.5 M10 50 300 600 3,000 8.7×10-4 12,000 860 1 0.09 -0.6 ~ +1.5
SJCM-80C-GR 80 87.2 31.7 15.5 M10 50 300 600 3,000 8.7×10-4 12,000 860 1 0.1 -0.6 ~ +1.5
SJCM-80C-RD 80 87.2 31.7 15.5 M10 50 380 760 3,000 8.7×10-4 14,000 860 1 0.08 -0.6 ~ +1.5
SJCM-100C-BL 104 96.2 34.2 16.9 M12 90 500 1,000 3,000 3.1×10-3 24,000 1,700 1 0.15 -0.6 ~ +2.0
SJCM-100C-DG 104 96.2 34.2 16.9 M12 90 500 1,000 3,000 3.1×10-3 24,000 1,700 1 0.12 -0.6 ~ +2.0
SJCM-100C-GR 104 96.2 34.2 16.9 M12 90 500 1,000 3,000 3.1×10-3 30,000 1,700 1 0.15 -0.6 ~ +2.0
SJCM-100C-RD 104 96.2 34.2 16.9 M12 90 600 1,200 3,000 3.1×10-3 40,000 1,700 1 0.1 -0.6 ~ +2.0
  • 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 30ºC.
  • 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)
12 14 15 16 18 19 20 22 24 25 26 28 30 32 35 40 45 50 60
SJCM-55C ● ● ● ● ● ● ● ● ● ● ● ●
SJCM-65C ● ● ● ● ● ● ● ● ● ● ● ● ●
SJCM-80C ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
SJCM-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)
  • Side-clamp Hub Split is NOT available
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)
RD Sleeve		 Slip Torque (N·m) by Inner Diameter (d1, d2)
12 14 15 16 18 19 20 22 24 25 26 28 30 32 35 40 45 50 60
SJCM-55C 150 40 55 65 75 95 100 110 120 120 120 120 120
SJCM-65C 360 55 60 70 75 80 85 94 98 103 110 118 125 130
SJCM-80C 760 90 100 110 118 125 130 150 155 160 175 185 200 220 250 280
SJCM-100C 1200 200 230 260 290 320 360 390 410 435 450 460 480 550