00-0901 Reconditioning tapped holes with Heli-Coil inserts
Data | ||
Metric thread | Core hole | OD of twist drill |
M6 | 6.31 6.04 | 6.1-6.2-6.25 |
M8 | 8.35 8.04 | 8.1-8.2-8.25-8.3 |
M81 | 8.32 8.04 | 8.1-8.2-8.25-8.3 |
M10 | 10.40 10.05 | 10.25 |
M12 | 12.50 12.05 | 12.25-12.5 |
M121.5 | 12.43 12.05 | 12.25 |
M14 | 14.53 14.06 | 14.25-14.5 |
M141.5 | 14.43 14.05 | 14.25 |
M152 | 15.30 15.20 | 15.25 |
M16 | 16.53 16.06 | 16.25-16.5 |
M161.5 | 16.43 16.05 | 16.25 |
M241.5 | 24.43 24.05 | 24.25 |
M261.5 | 26.43 26.05 | 26.25 |
M301.5 | 30.43 30.05 | 30.25 |
Special tools
Reconditioning
1 Widen core hole with twist drill.
Note
Do not counter-sink hole.
2 Re-tap the damaged thread with the special Heli-Coil thread tap.
3 Attach spindle (1) and orifice (2) matching the thread to the installation tool.
Note
Slot on orifice (2) must be alined with the marking on the installation tool (arrows).
4 Insert Heli-Coil threaded insert (3) into the spindle (1) in the installation tool.
Note
The driver stud of the Heli-Coil threaded insert must be positioned in the slot (arrow).
5 Turn threaded insert (3) with the spindle through the orifice until it is flush at the front.
6 Fit installation tool onto the threaded hole and screw in the insert without exerting pressure on the spindle.
Note
Screw in insert 1/2 to 1 1/2 turns deeper than the surface of the tapped hole.
7 Remove driver stud up to M12 with the stud breaker. For threaded inserts greater than M12, remove the driver stud by moving it up and down with pointed pliers.