Helicoil 4687-6 Straight Flute Hand Tap M6-1.00 Plug 3 Flutes UNC

M6-1.00 thread repair tap

The Helicoil 4687-6 is a straight flute hand tap designed for creating internal threads in screw thread insert applications. It suits mechanics and technicians who install Helicoil inserts to repair damaged or stripped M6 metric coarse threads in automotive and general engineering tasks.

High speed steel with plug chamfer

Bright uncoated high speed steel provides durability for general purpose tapping in steel, aluminium and cast iron. The plug chamfer with three flutes offers a balanced start for through holes and blind holes where chip clearance is adequate, while the right hand cut matches standard thread direction.

H2 thread limit for STI fit

Manufactured to an H2 thread limit, this tap produces the oversize pitch diameter required for Helicoil screw thread inserts, ensuring the installed insert meets the correct M6-1.00 nominal size. Using a standard tap instead would create threads too small for the insert to seat properly.