Osg 1712601 Spiral Point Sti Tap 6-32 Unc 3 Flute

Product Description

The OSG 1712601 is a Spiral Point STI tap designed for threading 6-32 UNC holes in a wide range of metals and alloys. Manufactured from vanadium high-speed steel with an oxide finish, this plug-chamfer tap drives chips forward ahead of the cutting zone, making it well suited for through-hole tapping operations. The H2 thread limit designation ensures consistent tolerance control for standard UNC fastener fitment. With an overall length of 2 inches and a thread length of 11/16 inches, it is a compact, production-ready tool for bench, drill press, and CNC tapping applications. Licensed machinists, toolroom technicians, and maintenance mechanics are the primary users.

This tap is used in applications requiring STI (Screw Thread Insert) threads, which are designed to accept helical wire inserts that restore or strengthen threaded holes in softer base materials such as aluminum, magnesium, and cast iron. The 6-32 UNC thread form and 3-flute geometry make it practical for small-diameter through-hole work in light manufacturing, maintenance and repair operations, and precision assembly environments where thread insert installation is specified.

Key Features

• Spiral point geometry pushes chips forward for efficient through-hole tapping
• Vanadium high-speed steel construction provides hardness and wear resistance across a broad range of workpiece materials
• Oxide finish reduces friction and improves chip flow during cutting
• H2 thread limit ensures close tolerance control for consistent UNC fitment
• Plug chamfer (3-5 threads) allows easy thread entry in through-hole applications
• STI thread form sized for use with helical wire thread inserts

Compatibility

Designed for tapping STI 6-32 UNC threaded holes intended to receive helical wire thread inserts in through-hole configurations across metals and alloys.

Installation Notes

Always secure the workpiece and ensure the tapping spindle or tap wrench is properly aligned before beginning the cut. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Reverse the tap periodically during hand tapping to break chips and prevent binding. Replace the tap if chipping, galling, or excessive torque is observed to avoid damaging the workpiece thread.