Osg 7018000 Spiral Point Sti Tap 3/8-24 Unf Hss

Product Description

The OSG 7018000 is a spiral point STI tap designed for threading 3/8-24 UNF holes in a push-through tapping application. Built from high-speed steel with a bright uncoated finish, this plug chamfer tap is suited for through-hole tapping where chips are pushed ahead of the cutting edges and clear the workpiece. With 3 flutes and an H2 thread limit, it produces consistent, accurate threads in steel, aluminum, and similar machinable materials. Overall length is 2-15/16 inches with a thread length of 1-1/4 inches, making it a compact, general-purpose tap for production and maintenance work.

This tap is used in machining, maintenance, and fabrication environments where UNF threads must be cut or chased in through-hole applications. The spiral point geometry makes it well suited for CNC tapping centers and drill presses where chip control in a through-hole configuration is a priority. It is commonly used by machinists, tool-and-die makers, and maintenance technicians working on threaded inserts, fixtures, and general metalwork requiring fine-pitch unified threads.

Key Features

• Spiral point geometry pushes chips forward through the hole for clean through-hole tapping
• High-speed steel construction provides good wear resistance across common metals
• Plug chamfer with 3 flutes for balanced cutting action and thread lead-in
• H2 thread limit ensures close dimensional control on finished thread form
• Bright uncoated finish suitable for use with standard cutting fluids
• STI (Screw Thread Insert) configuration for tapping holes that will accept helical coil inserts

Compatibility

Designed for cutting 3/8-24 UNF screw thread insert (STI) threads in through-hole applications across a range of machinable ferrous and non-ferrous metals.

Installation Notes

This tap should be installed and operated by a qualified machinist or maintenance technician familiar with tapping procedures and cutting fluid selection. Secure the workpiece fully before tapping and ensure proper alignment to avoid tap breakage. Use an appropriate cutting fluid for the material being tapped. Never reverse a spiral point tap aggressively under load; follow the tapping equipment manufacturer's speed recommendations for the material and tap size.