Hertel K007314AS Spiral Flute Sti Tap 8-32 Unc Hss

Product Description

The HERTEL K007314AS is a spiral flute STI (Screw Thread Insert) tap designed for cutting internal threads that accept Helicoil-style thread inserts. Manufactured from high-speed steel with a bright finish, it features a 52-degree helix angle that efficiently evacuates chips upward out of the hole — a critical advantage when tapping blind holes. The bottoming chamfer allows threading close to the bottom of a hole where full thread depth is required. With a thread size of 8-32 UNC and an H3 thread limit, this tap produces accurate oversized threads sized to accept standard STI inserts. Machinists, tool and die technicians, and maintenance professionals use this tap when repairing stripped threads or building insert-threaded assemblies.

This tap is suited for repair work and production threading in applications where 8-32 UNC Helicoil-compatible inserts are required. Typical scenarios include stripped thread repair in aluminum housings, electronic enclosures, and light machinery components. The spiral flute geometry makes it particularly effective in through-holes and shallow blind holes where chip clearance is a priority. The Helicoil reference number for this tap is 6905-2, which can be used to cross-reference compatible insert tooling and installation kits.

Key Features

• 8-32 UNC thread size for standard unified coarse thread STI applications
• 52-degree spiral flute helix for effective upward chip evacuation in blind and through holes
• Bottoming chamfer design allows threading to near full depth in blind holes
• H3 thread limit provides the oversized tolerance required for Helicoil-style insert fitment
• High-speed steel construction offers durability across a range of workpiece materials
• Bright finish with no coating — suitable for use with standard cutting fluids

Compatibility

Designed for use with Helicoil-style screw thread inserts; Helicoil reference number 6905-2. Intended for 8-32 UNC STI threading applications where H3 thread limit is specified.

Installation Notes

This tap is installed by a machinist or maintenance technician using a standard tap wrench or tapping fixture. Always use an appropriate cutting fluid for the workpiece material and ensure the tap is aligned perpendicular to the workpiece surface before starting. Power down and de-energize any equipment before performing thread repair on installed components. Follow the insert manufacturer's drilling and tapping sequence to achieve correct insert fit and thread engagement.