Hertel K007100AS Spiral Point Sti Tap 2-56 Unc Hss

Product Description

The HERTEL K007100AS is a spiral point STI tap designed for cutting Screw Thread Insert (STI) threads in a 2-56 UNC profile. It features a plug chamfer style and 2 flutes, making it suited for through-hole tapping in a range of metals and engineered materials. Manufactured from high-speed steel with a bright, uncoated finish, it delivers consistent thread form at moderate cutting speeds. The overall length is 1-7/8 inches with a thread length of 9/16 inches. This tap is used by machinists and maintenance technicians who are installing helicoil-style thread inserts to restore or reinforce threaded connections in fine-threaded applications.

This tap is used in production machining, repair, and maintenance operations where a 2-56 UNC STI thread form is required. The spiral point geometry pushes chips forward ahead of the cutting zone, making it well suited for through-hole applications. Typical use cases include aerospace component repair, precision instrument assembly, and any situation where a worn or damaged 2-56 thread needs to be rebuilt using a threaded insert. The Helicoil reference number for this tap is 02CSB.

Key Features

• 2-56 UNC STI thread profile for use with screw thread inserts
• Spiral point geometry pushes chips forward — ideal for through-hole tapping
• Plug chamfer style provides gradual thread engagement for controlled cutting
• High-speed steel construction handles a wide range of workpiece materials
• Bright, uncoated finish for general-purpose use without added surface treatment
• H1 thread limit for close-tolerance STI thread production

Compatibility

Designed as an OEM-style STI tap compatible with 2-56 UNC helicoil insert systems. Helicoil reference number 02CSB applies to this size and thread standard.

Installation Notes

This tap should be installed by a qualified machinist or maintenance technician familiar with thread insert procedures. Secure the workpiece firmly before tapping and use a properly aligned tap handle or machine spindle to avoid thread misalignment or tap breakage. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. At 2-56, tap breakage risk is elevated — avoid overfeeding and back off regularly to clear chips.