Accupro T2670445 Spiral Point Tap 5/16-18 2 Flutes Hss

Product Description

The ACCUPRO T2670445 is a spiral point tap designed for cutting right-hand internal threads in through-hole applications. With a 5/16-18 thread size, a 2-flute spiral point geometry, and a plug chamfer, this tap is built for machine tapping operations where chip expulsion ahead of the tool is required. It is manufactured from 3% vanadium high speed steel and carries a bright finish. The overall length is 2.7188 inches and the thread length is 22 millimeters. The H5 thread limit and Class 2B fit make it suitable for standard commercial thread tolerances.

This tap is rated for use in aluminum and similar non-ferrous materials. It performs in production and maintenance machine tapping setups where through-holes allow chips to push forward and clear the cutting zone. The 2-flute spiral point design reduces torque requirements compared to hand tap profiles, making it appropriate for CNC machining centers, drill presses, and tapping arms in light manufacturing or repair shop environments.

Key Features

• 5/16-18 UNC thread form with right-hand cut direction
• 2-flute spiral point geometry expels chips forward in through-hole operations
• Plug chamfer provides gradual thread engagement and reduced entry force
• 3% vanadium high speed steel for improved wear resistance over standard M2 HSS
• H5 thread limit with Class 2B fit for standard commercial thread tolerances
• Bright finish with no coating — suitable for use with cutting fluids in non-ferrous applications

Compatibility

Designed for machine tapping of through-holes in aluminum and comparable non-ferrous materials where a 5/16-18 Class 2B thread form is required.

Installation Notes

This tap is intended for use by machinists and tool-and-die professionals in machine tapping applications. Ensure the spindle speed and feed rate are appropriate for the material and tap diameter before operation. Use a suitable cutting fluid or tapping compound to extend tool life and maintain thread quality. Inspect the tap for chipping or wear before each use and replace if cutting edges show signs of degradation.