Hertel K007107AS Hand Sti Tap 2-56 Unc H2 Plug Chamfer

Product Description

The HERTEL K007107AS is a hand STI (Screw Thread Insert) tap designed to cut 2-56 UNC internal threads for helical insert installation. Ground to an H2 thread limit, this tap produces consistent thread geometry suited to close-tolerance insert applications. It features three flutes and a plug chamfer, making it appropriate for through-hole tapping where partial chamfer lead-in is acceptable. The tool is manufactured from high-speed steel with a bright, uncoated finish. Overall length is 1.875 inches with a thread length of 0.5625 inches. Machinists, maintenance technicians, and tool-and-die workers use this tap when preparing parent material to receive helical coil thread inserts in stripped or undersized holes.

This tap is used in applications requiring helical insert thread repair or original equipment manufacture at the 2-56 UNC thread standard. It is suited for hand tapping operations in ferrous and non-ferrous metals, plastics, and composite materials. The plug chamfer provides a 3-5 thread lead-in, making it the standard choice for through-holes and most repair scenarios. The Helicoil reference number for this tap is 02CPA, confirming its classification within the STI tooling system for that insert series.

Key Features

• 2-56 UNC thread form ground to H2 thread limit for consistent fit with helical inserts
• Plug chamfer provides 3-5 thread lead-in, suitable for through-hole tapping
• 3-flute geometry aids chip evacuation in hand tapping operations
• High-speed steel construction provides durability across a range of workpiece materials
• Bright uncoated finish — no coating buildup that could affect thread tolerances
• Helicoil reference number 02CPA for STI insert system compatibility verification

Compatibility

Designed for use in STI thread insert systems with Helicoil reference number 02CPA. Intended for 2-56 UNC applications requiring helical coil thread inserts. Verify insert manufacturer specifications before use to confirm tap and insert series alignment.

Installation Notes

Power down and secure any equipment being repaired before beginning thread repair work. Use a proper tap wrench and cutting fluid appropriate to the workpiece material to reduce tap breakage and extend tool life. Apply steady, even pressure and back off periodically to break chips. Inspect the tapped hole before installing the helical insert to confirm thread form and depth meet insert manufacturer requirements.