Torque Limiters for Chain and Belt Drives
Prevent damage from overloading. When overloaded, these limiters cause your sprocket or pulley to slip. Once the overload is removed, the limiters automatically reset. Set the torque within the range listed. Friction discs are between the hub and pressure plate.
Double-spring limiters have a second spring for handling nearly twice the torque of single-spring limiters.
Optional sprockets are designed specifically to fit their corresponding limiters. These hubless sprockets are not interchangeable.
For technical drawings and 3-D models, click on a part number.
Torque Limiters
Torque Limiter Shown with Optional Sprocket
Replacement Bushing
Replacement Friction Disc
Torque Limiters | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Keyway | Torque | Optional Sprockets | Replacement Friction Discs for Torque Limiters | Replacement Bushings for Optional Sprockets | |||||||||||||||
| For Shaft Dia. | OD | O'all Wd. | Wd. | Dp. | For Max. Sprocket or Pulley Wd. | Friction Disc Thick. | Min., ft.-lbs. | Max., ft.-lbs. | Hub Material | Each | For Roller Chain Trade Size | Each | Each | For Roller Chain Trade Size | Each | ||||
Single Spring | |||||||||||||||||||
| 1/4" | 1 5/16" | 1 3/8" | 1/16" | 1/32" | 11/32" | 1/8" | 1 | 6 | Steel | 00000000 | 000000 | 0000000 | 000000 | 0000000 | 000000 | __ | 000000 | 00 | |
| 5/16" | 1 5/16" | 1 3/8" | 3/32" | 3/64" | 11/32" | 1/8" | 1 | 6 | Steel | 00000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 3/8" | 1 5/16" | 1 3/8" | 3/32" | 3/64" | 11/32" | 1/8" | 1 | 6 | Steel | 00000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 3/8" | 2 1/4" | 2" | 3/32" | 3/64" | 1/2" | 1/8" | 5 | 35 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1/2" | 2 1/4" | 2" | 1/8" | 1/16" | 1/2" | 1/8" | 5 | 35 | Steel | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1/2" | 2 1/2" | 1 3/4" | 1/8" | 1/16" | 11/32" | 1/8" | 25 | 60 | Steel | 00000000 | 00000 | 0000000 | 00000 | 0000000 | 0000 | 000000 | 00000 | ||
| 1/2" | 3 3/8" | 2 1/8" | 1/8" | 1/16" | 1/2" | 1/8" | 11 | 100 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 5/8" | 2 1/4" | 2" | 3/16" | 3/32" | 1/2" | 1/8" | 5 | 35 | Steel | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 5/8" | 2 1/2" | 1 3/4" | 3/16" | 3/32" | 11/32" | 1/8" | 25 | 60 | Steel | 00000000 | 00000 | 0000000 | 00000 | 0000000 | 0000 | 000000 | 0000 | ||
| 5/8" | 3 3/8" | 2 1/8" | 3/16" | 3/32" | 1/2" | 1/8" | 11 | 100 | Steel | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 3/4" | 2 1/4" | 2" | 3/16" | 3/32" | 1/2" | 1/8" | 5 | 35 | Steel | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 3/4" | 2 1/2" | 1 3/4" | 3/16" | 3/32" | 11/32" | 1/8" | 25 | 60 | Steel | 00000000 | 00000 | 0000000 | 00000 | 0000000 | 0000 | 000000 | 0000 | ||
| 3/4" | 3 3/8" | 2 1/8" | 3/16" | 3/32" | 1/2" | 1/8" | 11 | 100 | Steel | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 3/4" | 3 1/2" | 2 3/16" | 3/16" | 3/32" | 1/2" | 1/8" | 50 | 120 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 3/4" | 4 1/2" | 2 7/8" | 3/16" | 3/32" | 7/8" | 1/8" | 18 | 190 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 7/8" | 2 1/2" | 1 3/4" | 3/16" | 3/32" | 11/32" | 1/8" | 25 | 60 | Steel | 00000000 | 00000 | 0000000 | 00000 | 0000000 | 0000 | 000000 | 0000 | ||
| 7/8" | 3 3/8" | 2 1/8" | 3/16" | 3/32" | 1/2" | 1/8" | 11 | 100 | Steel | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 7/8" | 3 1/2" | 2 3/16" | 3/16" | 3/32" | 1/2" | 1/8" | 50 | 120 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1" | 2 1/2" | 1 3/4" | 1/4" | 1/8" | 11/32" | 1/8" | 25 | 60 | Steel | 00000000 | 00000 | 0000000 | 00000 | 0000000 | 0000 | 000000 | 0000 | ||
| 1" | 3 3/8" | 2 1/8" | 1/4" | 1/8" | 1/2" | 1/8" | 11 | 100 | Steel | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1" | 3 1/2" | 2 3/16" | 1/4" | 1/8" | 1/2" | 1/8" | 50 | 120 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1" | 4 1/2" | 2 7/8" | 1/4" | 1/8" | 7/8" | 1/8" | 18 | 190 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1" | 5" | 2 7/8" | 1/4" | 1/8" | 5/8" | 1/8" | 90 | 250 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1" | 6" | 3" | 1/4" | 1/8" | 13/16" | 1/8" | 24 | 320 | Steel | 00000000 | 000000 | 0000000 | 000000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 1/8" | 4 1/2" | 2 7/8" | 1/4" | 1/8" | 7/8" | 1/8" | 18 | 190 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 1/8" | 5" | 2 7/8" | 1/4" | 1/8" | 5/8" | 1/8" | 90 | 250 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 3/16" | 5" | 2 7/8" | 1/4" | 1/8" | 5/8" | 1/8" | 90 | 250 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 1/4" | 3 1/2" | 2 3/16" | 1/4" | 1/8" | 1/2" | 1/8" | 50 | 120 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 1/4" | 4 1/2" | 2 7/8" | 1/4" | 1/8" | 7/8" | 1/8" | 18 | 190 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 1/4" | 5" | 2 7/8" | 1/4" | 1/8" | 5/8" | 1/8" | 90 | 250 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 1/4" | 6" | 3" | 1/4" | 1/8" | 13/16" | 1/8" | 24 | 320 | Steel | 00000000 | 000000 | 0000000 | 000000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 3/8" | 4 1/2" | 2 7/8" | 5/16" | 5/32" | 7/8" | 1/8" | 18 | 190 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 3/8" | 5" | 2 7/8" | 5/16" | 5/32" | 5/8" | 1/8" | 90 | 250 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 3/8" | 6" | 3" | 5/16" | 5/32" | 13/16" | 1/8" | 24 | 320 | Steel | 00000000 | 000000 | 0000000 | 000000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 7/16" | 5" | 2 7/8" | 3/8" | 3/16" | 5/8" | 1/8" | 90 | 250 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 7/16" | 6" | 3" | 3/8" | 3/16" | 13/16" | 1/8" | 24 | 320 | Steel | 00000000 | 000000 | 0000000 | 000000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 1/2" | 5" | 2 7/8" | 3/8" | 3/16" | 5/8" | 1/8" | 90 | 250 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 1/2" | 6" | 3" | 3/8" | 3/16" | 13/16" | 1/8" | 24 | 320 | Steel | 00000000 | 000000 | 0000000 | 000000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 5/8" | 5" | 2 7/8" | 3/8" | 3/16" | 5/8" | 1/8" | 90 | 250 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 5/8" | 6" | 3" | 3/8" | 3/16" | 13/16" | 1/8" | 24 | 320 | Steel | 00000000 | 000000 | 0000000 | 000000 | 0000000 | 00000 | __ | 000000 | 00 | |
Double Spring | |||||||||||||||||||
| 1/4" | 1 5/16" | 1 3/8" | 1/16" | 1/32" | 5/16" | 1/8" | 2 | 12 | Steel | 00000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 5/16" | 1 5/16" | 1 3/8" | 3/32" | 3/64" | 5/16" | 1/8" | 2 | 12 | Steel | 00000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 3/8" | 1 5/16" | 1 3/8" | 3/32" | 3/64" | 5/16" | 1/8" | 2 | 12 | Steel | 00000000 | 00000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 3/8" | 2 1/4" | 2" | 3/32" | 3/64" | 15/32" | 1/8" | 7 | 50 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1/2" | 2 1/4" | 2" | 1/8" | 1/16" | 15/32" | 1/8" | 7 | 50 | Steel | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1/2" | 2 1/2" | 1 3/4" | 1/8" | 1/16" | 11/32" | 1/8" | 30 | 95 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 0000 | 000000 | 0000 | ||
| 1/2" | 3 3/8" | 2 1/8" | 1/8" | 1/16" | 7/16" | 1/8" | 13 | 175 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 5/8" | 2 1/4" | 2" | 3/16" | 3/32" | 15/32" | 1/8" | 7 | 50 | Steel | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 5/8" | 2 1/2" | 1 3/4" | 3/16" | 3/32" | 11/32" | 1/8" | 30 | 95 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 0000 | 000000 | 0000 | ||
| 5/8" | 3 3/8" | 2 1/8" | 3/16" | 3/32" | 7/16" | 1/8" | 13 | 175 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 3/4" | 2 1/4" | 2" | 3/16" | 3/32" | 15/32" | 1/8" | 7 | 50 | Steel | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 3/4" | 2 1/2" | 1 3/4" | 3/16" | 3/32" | 11/32" | 1/8" | 30 | 95 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 0000 | 000000 | 0000 | ||
| 3/4" | 3 3/8" | 2 1/8" | 3/16" | 3/32" | 7/16" | 1/8" | 13 | 175 | Steel | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 3/4" | 3 1/2" | 2 3/16" | 3/16" | 3/32" | 1/2" | 1/8" | 60 | 190 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 3/4" | 4 1/2" | 2 7/8" | 3/16" | 3/32" | 13/16" | 1/8" | 20 | 285 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 7/8" | 2 1/2" | 1 3/4" | 3/16" | 3/32" | 11/32" | 1/8" | 30 | 95 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 0000 | 000000 | 0000 | ||
| 7/8" | 3 3/8" | 2 1/8" | 3/16" | 3/32" | 7/16" | 1/8" | 13 | 175 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 7/8" | 3 1/2" | 2 3/16" | 3/16" | 3/32" | 1/2" | 1/8" | 60 | 190 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1" | 2 1/2" | 1 3/4" | 1/4" | 1/8" | 11/32" | 1/8" | 30 | 95 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 0000 | 000000 | 0000 | ||
| 1" | 3 3/8" | 2 1/8" | 1/4" | 1/8" | 7/16" | 1/8" | 13 | 175 | Steel | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1" | 3 1/2" | 2 3/16" | 1/4" | 1/8" | 1/2" | 1/8" | 60 | 190 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1" | 4 1/2" | 2 7/8" | 1/4" | 1/8" | 13/16" | 1/8" | 20 | 285 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1" | 5" | 2 7/8" | 1/4" | 1/8" | 5/8" | 1/8" | 120 | 400 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1" | 6" | 3" | 1/4" | 1/8" | 3/4" | 1/8" | 26 | 440 | Steel | 00000000 | 000000 | 0000000 | 000000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 1/8" | 4 1/2" | 2 7/8" | 1/4" | 1/8" | 13/16" | 1/8" | 20 | 285 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 1/8" | 5" | 2 7/8" | 1/4" | 1/8" | 5/8" | 1/8" | 120 | 400 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 3/16" | 5" | 2 7/8" | 1/4" | 1/8" | 5/8" | 1/8" | 120 | 400 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 1/4" | 3 1/2" | 2 3/16" | 1/4" | 1/8" | 1/2" | 1/8" | 60 | 190 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 1/4" | 4 1/2" | 2 7/8" | 1/4" | 1/8" | 13/16" | 1/8" | 20 | 285 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 1/4" | 5" | 2 7/8" | 1/4" | 1/8" | 5/8" | 1/8" | 120 | 400 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 1/4" | 6" | 3" | 1/4" | 1/8" | 3/4" | 1/8" | 26 | 440 | Steel | 00000000 | 000000 | 0000000 | 000000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 3/8" | 4 1/2" | 2 7/8" | 5/16" | 5/32" | 13/16" | 1/8" | 20 | 285 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 3/8" | 5" | 2 7/8" | 5/16" | 5/32" | 5/8" | 1/8" | 120 | 400 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 3/8" | 6" | 3" | 5/16" | 5/32" | 3/4" | 1/8" | 26 | 440 | Steel | 00000000 | 000000 | 0000000 | 000000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 7/16" | 5" | 2 7/8" | 3/8" | 3/16" | 5/8" | 1/8" | 120 | 400 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 7/16" | 6" | 3" | 3/8" | 3/16" | 3/4" | 1/8" | 26 | 440 | Steel | 00000000 | 000000 | 0000000 | 000000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 1/2" | 5" | 2 7/8" | 3/8" | 3/16" | 5/8" | 1/8" | 120 | 400 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 1/2" | 6" | 3" | 3/8" | 3/16" | 3/4" | 1/8" | 26 | 440 | Steel | 00000000 | 000000 | 0000000 | 000000 | 0000000 | 00000 | __ | 000000 | 00 | |
| 1 5/8" | 5" | 2 7/8" | 3/8" | 3/16" | 5/8" | 1/8" | 120 | 400 | Steel | 00000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 | 000000 | 0000 | ||
| 1 5/8" | 6" | 3" | 3/8" | 3/16" | 3/4" | 1/8" | 26 | 440 | Steel | 00000000 | 000000 | 0000000 | 000000 | 0000000 | 00000 | __ | 000000 | 00 | |
Electric Clutch/Brakes for Face-Mount Motors
From one assembly, electrically control when to transmit power with a clutch and when to hold a load in place with a brake. The clutch and brake each have their own circuit, so they can be controlled separately. To disengage either one, remove power to its circuit. Disengaging the clutch disconnects the load from your motor, stopping power transmission without stopping your motor. Disengaging the brake releases it.
These clutch/brakes have a mounting pattern that is designed to mount directly to your NEMA face-mount motor. Fasten them to your motor's shaft by tightening the set screws, which bite into your shaft for a tight hold. To the other side, attach a gearbox or couple a gear, sprocket, pulley, or other component.
Controllers (sold separately) convert an AC input into two DC outputs that alternate engaging the clutch and the brake. If their green LED is lit, the clutch has power. If their red LED is lit, the brake has power. Mount these controllers inside a conduit box (sold separately).
Conduit boxes (sold separately) attach directly to these clutch/brakes to protect wiring from dust and moisture.
Covers (sold separately) change the open design of these clutch/brakes into a totally enclosed fan-cooled unit, protecting them from dust and moisture.
For technical drawings and 3-D models, click on a part number.
Clutch/Brakes
| Max. Power | Max. Speed, rpm | Voltage | For Motor Frame Size | OD | Overall Lg. | Material | Drive Direction | Shaft Diameter | Keyway Wd. × Keyway Dp. | Electrical Connection Type | Wire Lead Lg. | Specifications Met | Each | |
Through Shaft | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/4 hp | 3,600 | 90V DC | NEMA 48Y, NEMA 56C | 6 3/4" | 6 3/4" | Steel | Clockwise and Counterclockwise | 5/8" | 3/16" × 3/16" | Hardwire | 36" | UL Listed, C-UL Listed | 00000000 | 000000000 |
| 3 hp | 3,600 | 90V DC | NEMA 48Y, NEMA 56C | 6 3/4" | 6 3/4" | Steel | Clockwise and Counterclockwise | 5/8" | 3/16" × 3/16" | Hardwire | 36" | UL Listed, C-UL Listed | 00000000 | 00000000 |
Controllers
Input | Output | |||||||
|---|---|---|---|---|---|---|---|---|
| Voltage | Frequency, Hz | Voltage | Current, mA | Wire Lead Lg. | Temperature Range, °F | Specifications Met | Each | |
| 120V AC | 50/60 | 90V DC | 0.8 | 5 1/2" | -20° to 110° | UL Listed, C-UL Listed | 0000000 | 0000000 |
Conduit Boxes
| Number of Knockouts | Knockout Trade Size | Lg. | Wd. | Ht. | Material | Environmental Rating | Specifications Met | Each | |
| 2 | 1/2 | 2 1/4" | 3 1/4" | 2 3/16" | Galvanized Steel | NEMA 4 | UL Listed, C-UL Listed | 00000000 | 000000 |
Covers
| Material | Includes | Each | |
| Steel | Two Covers, Two Gaskets, Four Mounting Screws | 00000000 | 000000 |