Safety Coupling

Safety Coupling is the most optimistic solution to meet both purposes
of power transmission and overload prevention.

STL Series

Safety Coupling for Torque Overload Protection (Coupling attached Type)

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

General Set-screw Type

A.P. LOCK Type

Dimensions / Performance
Model CAD Torque
Range
(N·m)		 Spring Size (±0.3mm)
Color Q’ty D DC D1 DN DL L L1 O P Q R X F1 F2
STL25-L 1.5 ~ 7 BLUE 3 74 54 25 58 30 95.6 19 34.8 33.6 27.2 12.5 1.2 6.3 24.5
STL25-M 4.5 ~ 20 RED 6
STL25-H 9 ~ 25 GREEN 6
STL55-L 7.5 ~ 27 BLUE 6 104 80 35 70 40 120.8 29.7 52.1 42.9 25.8 14.5 1.3 9.4 20.5
STL55-M 13.5 ~ 41 RED 6
STL55-H 21 ~ 55 GREEN 6
STL150-L 20 ~ 50 BLUE 5 123 88 46 90 55 144.9 30 69.8 49.1 26 14.5 2.1 10 20.5
STL150-M 30 ~ 80 RED 5
STL150-H 55 ~ 150 GREEN 10
Model CAD MC MS MN ML Max.
rpm
(min-1)		 Moment
of Inertia
(kg·m2)		 Mass
(kg)		 Permissible Misalignment
Size Fastening
Torque		 Size Fastening
Torque		 Size Fastening
Torque		 Size Fastening
Torque		 Angular
(˚)		 Parallel
(mm)		 End-play
(mm)
STL25-L 2-M5 8 2-M3 0.7 2-M4 1.7 4-M4 3.5 700 7.1X10-4 1.2 0.6 0.1 ±0.5
STL25-M
STL25-H
STL55-L 1-M8 30 2-M4 1.7 2-M5 4 6-M4 3.5 550 3.3X10-3 3 0.6 0.1 ±0.5
STL55-M
STL55-H
STL150-L 1-M8 30 2-M6 7 2-M6 7 6-M4 3.5 400 8.3X10-3 4.8 1 0.2 ±0.6
STL150-M
STL150-H
Standard Inner Diameter (ID)
Model Standard Inner Diameter (d1, d2) (mm)
10 11 12 14 15 16 17 18 19 20 21 22 24 25 28 30 32 35 38 40 42 45
STL25 d1 Coupling side General ● ● ● ● ● ● ● ● ● ● ● ● ● ●
   d2 Torque Limiter side General
Set-screw		 ● ● ● ● ●
A.P. Lock ● ● ●
STL55 d1 Coupling side General ● ● ● ● ● ● ● ● ● ● ● ● ● ●
   d2 Torque Limiter side General
Set-screw		 ● ● ● ● ● ● ● ● ● ● ●
A.P. Lock ● ● ● ● ● ● ●
STL150 d1 Coupling side General ● ● ● ● ● ● ● ● ● ● ● ● ●
   d2 Torque Limiter side General
Set-screw		 ● ● ● ● ● ● ● ● ● ● ● ● ● ●
A.P. Lock ● ● ● ● ● ● ● ● ● ● ● ● ●
Tightening amount – Slip torque correlation chart
How to Order
① Disengagement Torque Set-up
No mark
User’s own set-up
TS(torque)
Already set-up at a certain torque at the dispatch stage
② Keyway
No mark
No Keyway
K(b size)
Keyway processed according to the indicated b size. (Keyway is not applicable on A.P. Lock type)
③ Clamping way of torque limiter side
N
General Set-screw Type
P
A.P. Lock Type

※ N type products (General set-screw on Torque limiter side) should be accompanied with key/keyway due to structural reasons. If the size of keyway is non-standard, please contact our customer service team.
(In case your device cannot have a key, please make sure you discuss with our customer service team before placing an order.)

※ Due to its structural conditions, STL series cannot be modified once it is processed.