BIG-SERT ® PROFESSIONAL THREAD REPAIR KITS OVERSIZED HOLES

THREAD REPAIR KIT

BIG-SERT® OVERSIZED THREAD REPAIR KITS AND INSERTS

Used for threads which have been previously repaired and failed.

These kits will repair holes that were repaired by helicoil, perma-coil,
uni-coil, recoil or any other simular coil style insert that has failed.

BIG-SERT® is a heavy wall solid bushing, easy to install with positive placement. BIG-SERT® gives increased load protection for critical use. BIG-SERT® will repair oversize holes which have previously been repaired.

NOTE: Bottom few internal threads are incomplete.

The install driver seats the insert and completes the bottom internal threads locking the insert in place.
This pushes the pin out to contact the threaded hole. Back out of the insert is prevented by the cam lock effect of the pin.

BIG-SERT ® THREAD REPAIR KITS AND INSERTS

NOTE: Lengths marked in RED are the inserts supplied in the kits.
Click here: for Engineering data

Optional tool   TAP GUIDES INSURE THAT THREADS ARE SQUARE TO SURFACE.
The lower portion of the tap guide should remain as square as possible to the engine surface. Turn the tap slowly while making sure the guide remains flush.  TAP GUIDES
INCH SIZE PART NO. 1/4-20 75405 1/4-28 75405 5/16-18 75515 5/16-24 75515 3/8-16 75315 3/8-24 75315 7/16-14 57655 7/16-20 57655 1/2-13 75115 1/2-20 75115	METRIC SIZE PART NO. M6x1.0 75605 M8x1.25 75825 M10x1.0 75025 M10x1.25 75025 M10x1.5 75025 M12x1.25 75255 M12x1.5 75255 M12x1.75 75255