Osg 1825200 Spiral Point Sti Tap 8-32 Unc 2 Flute Hss

Product Description

The OSG 1825200 is a spiral point STI tap designed for cutting 8-32 UNC threads in through-hole applications. Built from high-speed steel (HSS) with a bright, uncoated finish, this plug-chamfer tap drives chips forward ahead of the cut, making it well suited for tapping in continuous-feed production and repair work. It measures 2.382 inches overall length with a 0.511-inch thread length and carries a H2 thread limit for close dimensional control. This is a Series 125 tap intended for use by machinists, maintenance technicians, and fabricators working in metal tapping applications.

This tap is used for creating STI (Screw Thread Insert) threads, which are oversized to accept helical coil inserts that restore or reinforce standard 8-32 UNC fastener holes. Typical applications include repair of stripped threads in aluminum, cast iron, and steel components across industrial maintenance, aerospace ground support, and general fabrication environments. The plug chamfer provides a gradual lead-in and is best suited for through-hole tapping rather than blind-hole work.

Key Features

• Spiral point geometry pushes chips forward, reducing chip clogging in through-hole tapping
• High-speed steel construction provides toughness across a range of workpiece materials
• Plug chamfer with 2 flutes for controlled cutting entry in through-hole applications
• H2 thread limit for close tolerance control on finished thread dimensions
• Bright, uncoated finish suitable for use with standard tapping fluids and cutting oils
• STI thread form sized for use with helical coil thread inserts in 8-32 UNC holes

Compatibility

Designed as an STI tap for use with helical coil thread insert systems requiring an 8-32 UNC host thread. Confirm insert manufacturer specifications to verify tap sizing before use.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with tapping operations and thread insert systems. Secure the workpiece fully before tapping and use an appropriate cutting fluid or tapping compound to extend tool life and improve thread quality. Back the tap out periodically to clear chips when working in deeper holes. Follow the insert manufacturer guidance for drill size and tap depth to ensure proper insert seating.