Ball Detent Torque Limiters

The table lists 8 sizes with trip torque from 4 to 2400 N·m, bores up to Ø145 mm, maximum speed 4000 rpm. The slip torque is set on the machine within each size's range; other bores and combined sprocket / pulley / coupling versions are made to drawing.

WFSC ball-detent torque limiters (safety clutches) transmit torque backlash-free for their entire service life — compact, easy to adjust, low inertia. On overload the balls cam out of their detents and the unit slips; a signal ring can trip a switch to cut power and protect the machine. For servo / stepper and other high-dynamic precision drives needing overload protection. 8 sizes; L / M / H trip-torque stages cover 4–2400 N·m. Choose the WFSC ball-detent limiter when the drive must disengage instantly and precisely on overload and re-engage by itself: it transmits torque backlash-free in normal running, the balls cam out at the set torque, and a proximity switch can pick up the disengagement to stop the machine — typical on packaging, printing and automated assembly axes.

Yes. Everything on this page is made to drawing, and the table is only the standard-size subset of the catalogue. Minimum order quantity is one piece — we routinely make single replacement parts for OEMs whose original supplier has discontinued the item. Send a DWG, STEP or PDF drawing (or a sample part): you get a formal quotation within 24 hours after the information is complete, and the first article ships within 30 days of drawing approval, with inspection records.

Send: the torque at which the drive should slip (or motor power and speed so we can calculate it), bore diameters and keyways, speed, duty (how often overloads occur), space available, operating temperature, and whether you want a sprocket, pulley, gear or coupling built onto the limiter. We will confirm size and pre-set the trip torque before shipping.