8CPA by HELI-COIL

The HELI-COIL 8CPA is a precision straight flute plug tap engineered specifically for cutting STI (Screw Thread Insert) internal threads to accept 1/2-13 UNC wire thread inserts. Designed with an H4 pitch diameter limit, this high-speed steel STI tap creates oversized threads with accurate pitch geometry to accommodate the wire cross-section of installed inserts, ensuring a high-strength, perfectly sized final internal thread in host materials.

STI Tap Geometry specifically oversized to cut pre-insert threads that perfectly accept 1/2-13 UNC wire thread inserts.

Plug Chamfer Style features 3 to 5 chamfered threads for easy starting and smooth alignment in through holes and deep blind holes.

Straight Flute Design provides efficient chip evacuation and tool rigidity across a wide range of standard metals and alloys.

High-Speed Steel Construction crafted from durable HSS to maintain sharp cutting edges and resist wear during volume tapping operations.

H4 Tolerance Class precision ground to H4 pitch diameter limits to guarantee reliable, repeatable thread tolerances for critical fastener fit.