| Fit Classification | No-Load Breakaway Torque (in-lb) | Description |
| F1 | 6.0 – 24.0 | Extremely tight. Users may need the assistance of mechanical advantage/leverage, such as a steel bar through the bore, to move the ball. |
| F2 | 2.0 – 6.0 | Moderately tight. Users should be able to move the ball by hand, but noticable resistance will be felt. |
| F3 | 0.0 – 1.0 | No clearance present in the bearing, however, the ball will move freely with light to moderate finger pressure, with very light resistance felt. |
- PTFE lined bearings are self-lubricating and maintenance free.
- F2 is the FK standard fit unless specified otherwise.
- To designate an F1 or F3 fit, please add the suffix “-F1” or “-F3” to our standard part number. Example: JMX12T-F3
- These fits are available on PTFE lined product only.
