Hertel K007092AS Hand Sti Tap 1/2-13 Unc H3 Plug Chamfer

Product Description

The HERTEL K007092AS is a hand STI (Screw Thread Insert) tap designed to cut 1/2-13 UNC threads for Helicoil-style thread insert installations. It features an H3 thread limit for controlled tolerance fitment and a plug chamfer that starts the cut gradually, making it suitable for through-hole and moderately deep blind-hole applications. Manufactured from high speed steel with a bright finish, this 4-flute tap delivers consistent chip clearance during hand tapping operations. It measures 3-13/16 inches overall length and weighs 0.6 pounds. Machinists, maintenance technicians, and field service professionals use this tap when repairing stripped or damaged threads in metal components.

This tap is used when installing Helicoil or equivalent screw thread inserts in 1/2-13 UNC applications across industrial, mechanical, and maintenance environments. The STI geometry cuts a slightly oversized thread profile that accepts the wire-form insert, restoring the fastened joint to full original thread strength. It is appropriate for use in steel, aluminum, cast iron, and similar metals where hand tapping is the preferred method. The Helicoil reference number for this tap is 8CPB. Typical applications include engine component repair, structural fastener restoration, and equipment overhaul work.

Key Features

• STI thread profile sized for Helicoil-style insert installation, Helicoil reference 8CPB
• H3 thread limit for consistent, close-tolerance thread fit
• Plug chamfer with 3-5 lead threads for easy starting in through or open blind holes
• 4-flute design promotes even chip evacuation during hand tapping
• High speed steel construction for durability across common engineering metals
• Bright finish with no coating buildup, maintaining dimensional accuracy

Compatibility

Designed for use with Helicoil-style screw thread inserts in 1/2-13 UNC thread applications. Helicoil reference number 8CPB. Intended for hand tapping operations in metalworking and maintenance repair contexts.

Installation Notes

This tap is installed by hand using a tap wrench; do not use power drive without appropriate torque control to avoid tap breakage. Apply cutting fluid appropriate to the workpiece material before and during tapping to reduce heat and extend tap life. Ensure the hole is drilled to the correct STI tap drill diameter for 1/2-13 UNC inserts before beginning the thread-cutting operation. Follow the insert manufacturer's installation sequence: tap the hole, clean the threads, then install the insert with the proper insert tool.