Hertel K007039AS Hand Sti Tap 10-32 Unf H3 Plug Chamfer

Product Description

The HERTEL K007039AS is a hand STI (Screw Thread Insert) tap designed to cut 10-32 UNF threads for helical coil thread insert installation. Manufactured from high speed steel with a bright finish, it features a plug chamfer entry and an H3 thread limit for reliable tolerance control in machine and repair work. The tap carries a 1-inch thread length and a 2.5-inch overall length, making it well suited for through-hole and moderate-depth blind-hole applications. With 3 flutes, it provides adequate chip clearance for general-purpose tapping in ferrous and non-ferrous materials. Machinists, maintenance technicians, and tool-and-die professionals reach for this tap when preparing holes to receive Helicoil-style thread inserts.

This tap is used in both production and repair environments where stripped or damaged internal threads need to be restored using a threaded insert. It is appropriate for use in light-duty machine frames, fastener repair on castings, and precision assemblies requiring 10-32 UNF thread inserts. The plug chamfer style makes it a practical choice for starting threads in through holes or shallow blind holes where a bottoming chamfer is not required. The Helicoil reference number for this tap is 3FPA.

Key Features

• 10-32 UNF thread form sized specifically for STI helical insert installation
• H3 thread limit provides consistent oversize tolerance for proper insert fit
• High speed steel construction offers durability across a range of workpiece materials
• Plug chamfer entry suits through-hole and non-bottoming blind-hole applications
• 3-flute geometry promotes chip evacuation during hand tapping
• Bright finish with 1-inch thread length and 2.5-inch overall length

Compatibility

Designed for use with Helicoil-style screw thread inserts referencing Helicoil number 3FPA. Compatible with standard hand tap wrenches accepting the appropriate square shank drive.

Installation Notes

This tap is intended for hand tapping operations performed by a machinist or maintenance technician. Always secure the workpiece before tapping and use a proper tap wrench to maintain axial alignment. Apply an appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. Reverse the tap periodically to break chips and prevent binding, particularly in deeper holes.