00-0901 Repairing tapped holes with Heli-Coil inserts
Data
Metric thread Core hole dia. Spiral drill OD
M6 6.31 6.1-6.2-6.25
6.04
M8 8.35 8.1-8.2-8.25-8.3
8.04
M8 1 8.32 8.1-8.2-8.25-8.3
8.04
M10 10.40 10.25
10.05
M12 12.50 12.25-12.5
12.05
M12 1.5 12.43 12.25
12.05
M14 14.53 14.25-14.5
14.06
M14 1.5 14.43 14.25
14.05
M15 2 15.30 15.25
15.20
M16 16.53 16.25-16.5
16.06
M16 1.5 16.43 16.25
16.05
M24 1.5 24.43 24.25
24.05
M26 1.5 26.43 26.25
26.05
M30 1.5 30.43 30.25
30.05
Special tools
Repairing
1 Widen core hole with spiral drill.
Note
Do not countersink hole.
2 Re-tap the damaged thread with the special Heli-Coil thread tap.
3 Fit spindle (1) and mouthpiece (2) matching the thread onto the installation tool.
Note
Slot on mouthpiece (2) must be aligned 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 located in the slot (arrow).
5 Turn threaded insert (3) with the spindle through the mouthpiece until the latter is flush at the front.
6 Fit installation tool onto the threaded hole and turn in the insert without exerting pressure on the spindle.
Note
Turn in insert 1/2 to 1 1/2 turns deeper than the surface of the tapped hole.
7 Remove studs up to M12 by means of stud breaker. For threaded inserts greater than M12, remove studs with fine-nosed pliers by upward and downward movements.