Safety Coupling

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

STL / STL-F Series download

Safety Coupling

Why Safety Coupling?
Transmits Motion
Absorbs Misalignment
Torque Limiter
Turns into idling
when overload
Safety Coupling
Two Functions in One
Safety Coupling Line-up
Coupling attached TypeView more >
  • For connection between shafts
  • Absorption of parallel/angular misalignment
Flange TypeView more >
  • For attachment to different objects
    (e.g. timing pulley, sprocket , etc.)
Product Features
  1. Wide range of standard preset torque values
  2. Absorption of misalignment by plate springs. (Disk Coupling attached type Only)
  3. Easier torque adjustment with an adjusting nut and an indicator of spring pressure amount
  4. Various assembly options according to each clamping objects
Disk Coupling Attached Type (STL)
Flange Type (STL-F)
Operating Principles (How it works)

If torque is overloaded (exceeded the disengagement set value), balls fixed on the V pocket-shaped ball plate push the ball guide while getting out of the ball plate. And then idle operation occurs between the coupling section and the main hub, which enables to mechanically cut off motion.

Additional Sensor Attachment
  • You may know how far the ball guide is pushed using an additional limit switch or a proximity sensor attached underneath the ball guide. It means you can link them to the driving part (e.g. motor etc.) to automatically stop the motion. (Please refer to “X” value in the “Dimensions / Performance” tables for the distance how far ball guide is pushed)
  • If you decide to use a proximity sensor together, make sure you check if the sensor senses the actual location of the ball guide, by making the safety coupling idle with the intentional manual overload for test.
Disengagement Torque Set-up Guide
  • Fasten the adjusting nut by ticks on the main hub according to disengagement torque information by each spring pressure gauge.
  • The harder fastening, the higher slip torque.
  • The margin of error (between disengagement torque to actual slip torque) is smaller than ±10%.