| SUPPLIER | FRICTION | OVER-RUNNING | CENTRIFUGAL | TORQUE LIMITING |
| COMBIDRIVE | yes | yes | yes | yes |
| HUCO ENGINEERING | yes | no | no | yes |
| RINGSPANN | yes | yes | no | yes |
| STEIBER | yes | yes | no | no |
| BARDEN CORP | yes | no | no | no |
| CROSS AND MORSE | yes | yes | no | yes |
| RELIANCE ELECTRIC | no | no | yes | yes |
| WARNER ELECTRIC | yes | no | no | no |
| WELLMAN BIBBY | yes | yes | yes | yes |
| WICHITA | yes | no | yes | yes |