Thread Repair Kit
A coil insert thread repair system that includes correctly sized components to
repair and fit five sizes of coil insert: M5 x 0.8, M6 x 1.0, M8 x 1.25, M10 x 1.5 and
M12 x 1.75.
For each size the kit includes an oversized tap, coil type insert, ratchet insert driver
tool and a pin punch to remove the driving tang of the coil insert.
Code
Description
A
Oversized tap
B
Insert driver attachment
C
Thread coil inserts
D
Ratchet driver tool
E
Pin Punch
2
3
Components
Instructions For Use
• Drill out remains of the damaged thread using a correctly sized drill bit as
specified in the table.
• Fit the supplied tap (A) into a suitable tap holder (not supplied) and cut a new
thread as deep as is required to ensure that the coil insert (C) does not protrude
above the top surface of the component being repaired. Ensure a suitable cutting
fluid is used and wind the tap back ½ a turn for every full turn clockwise to
ensure the swarf is effectively cleared without damage to the newly cut thread.
• Fit the insert driver attachment (B) into the ratchet driver tool (D).
• Engage the tang on the thread coil insert (C) with the slot on the insert driver (B).
• Wind the insert into the newly tapped hole to the required depth and remove the
insertion tool.
• To break off the tang, use the correctly sized pin punch (E). This is slid into the
newly threaded hole and tapped with a hammer to break the tang off.
Note: when repairing threads that are open into an engine, use long nose pliers to
break off the tang to avoid the tang entering the engine.
Please note: Due to the nature of the tools in this kit the components are considered
consumable.
M8-1.25
ST M8 x 1.25
M8-1.25
A
C
B
E
D
Suggested Drill Sizes
Thread size
Alloy (mm)
Steel / Magnesium Plastic (mm)
M5 x 0.8
5.2
5.3
M6 x 1.0
6.25
6.3
M8 x 1.25
8.3
8.4
M10 x 1.5
10.5
10.5
M12 x 1.75
12.5
12.5
