ER Collet Nuts with Ball Bearing
The friction between the collet and the nut when tightening and loosening is almost eliminated due to the cone and release flange in the ball bearing collet nut, which remains stationary relative to the collet thereby almost eliminating friction between the collet and the nut when tightening and loosening the collet.
- Reduced friction allows a higher clamping pressure to be applied.
- Easier to use - especially when closing a collet to the smaller end of its range.
- Compatible with collet chucks fitted with Type T1 collet nuts.
| Code |
Size |
D |
L |
Thread |
Hex Head AF |
| 050-110-11540 |
ER11 |
19mm |
11.3mm |
M14x0.75 |
17mm |
| 050-110-16570 |
ER16 |
28mm |
17.5mm |
M22x1.5 |
25mm |
| 050-110-20570 |
ER20 |
34mm |
19mm |
M25x1.5 |
30mm |
Mounting ER Collets
Inspecting the inside of an ER collet nut reveals an internal flange that has been machined eccentric to the main axis of the nut. This is not a machining error but is designed that way to lock onto the groove of the collet and aid its release from the chuck body.
For this feature to work properly, the collet must be mounted in the nut first before fitting the assembly into the chuck body. To mount the collet in the nut, insert it on an angle, turn slightly and push it into the nut until it clicks into place on the eccentric flange. The cutter may now be fitted and the assembly tightened hard into the chuck body.
To remove the cutter, slacken and undo the nut until resistance is felt. Then, using a collet wrench, further undo the nut until the collet is released from the chuck body.
Removal of the collet from the nut is the reverse of the mounting procedure.