Osg 7016200 Spiral Point Sti Plug Tap 5/16-24 Unf Hss

Product Description

The OSG 7016200 is a spiral point STI plug tap designed for threading 5/16-24 UNF Screw Thread Insert holes in metalworking and maintenance applications. Built from high-speed steel with a bright, uncoated finish, this tap pushes chips forward ahead of the cut, making it well suited for through-hole tapping operations. It features three flutes, an H3 thread limit for consistent tolerance control, and measures 2-23/32 inches overall with a 1-1/8-inch thread length. The plug chamfer provides a gradual lead-in for smooth thread formation. This tool is typically installed by machinists, maintenance technicians, and industrial trade professionals working with threaded insert repair or installation.

The 7016200 is intended for STI (Screw Thread Insert) tapping, which produces an oversized thread to accept a helical wire insert that restores a standard thread form. It is commonly used in automotive, aerospace, and general manufacturing repair work where damaged threads in aluminum, cast iron, steel, and similar materials need to be restored to original specifications. This tap is appropriate for both production and repair environments where 5/16-24 UNF threaded inserts are required.

Key Features

• Spiral point design pushes chips forward, ideal for through-hole tapping
• High-speed steel construction provides durability across a range of metals
• H3 thread limit ensures consistent tolerance fit for threaded inserts
• Plug chamfer allows gradual thread engagement and reduced tool stress
• Three-flute geometry balances chip evacuation and cutting stability
• Bright, uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed for STI tapping applications requiring a 5/16-24 UNF thread form, compatible with standard helical wire threaded insert systems in through-hole configurations.

Installation Notes

This tap should be installed in a drill press, tapping head, or hand tap wrench by a qualified machinist or maintenance technician. Always secure the workpiece before tapping and use an appropriate cutting fluid for the base material being threaded. Verify the correct drill size for the STI oversized thread before starting. Do not force the tap if resistance increases unexpectedly - back off to clear chips and prevent breakage.