Accupro T2644505 Spiral Flute Tap 3/8-24 3 Flute Hss

Product Description

The ACCUPRO T2644505 is a spiral flute tap designed for threading 3/8-24 UNF holes in a wide range of materials. Built from 3% Vanadium High Speed Steel (HSS), this tap delivers improved wear resistance and edge retention compared to standard M2 HSS. The modified bottoming chamfer allows threading close to the bottom of blind holes, making it well suited for tight-tolerance applications. A 40-degree helix angle promotes efficient chip evacuation up and out of the hole. The H5 thread limit ensures consistent dimensional control for applications requiring precise thread fit. Overall length is 2.9375 inches. This tap is used by machinists, maintenance technicians, and tool-and-die professionals working on production or repair threading operations.

This tap is intended for right-hand 3/8-24 UNF threads in blind or through holes where a modified bottoming chamfer is required. The fast spiral flute style makes it especially effective in softer metals, plastics, and other materials that produce stringy chips. It is a single-piece hand or machine tap suitable for use in CNC machining centers, drill presses, and tapping arms. The bright uncoated finish keeps costs in check for general-purpose threading work where coating is not required by the application.

Key Features

• 3/8-24 UNF thread size for fine-pitch threading applications
• 3% Vanadium HSS construction for extended tool life and edge retention
• Modified bottoming chamfer for threading close to the bottom of blind holes
• 40-degree helix angle for fast, efficient chip evacuation
• H5 thread limit for consistent, close-tolerance thread control
• Right-hand flute and right-hand thread, bright uncoated finish

Compatibility

Designed as a standard replacement or production tap for 3/8-24 UNF threading operations in machine or hand tapping setups requiring a modified bottoming chamfer and spiral flute geometry.

Installation Notes

This tap should be installed in a proper tap holder, collet chuck, or tapping head rated for the shank diameter before use. Ensure the workpiece is securely fixtured and the spindle is aligned to the hole centerline to prevent tap breakage. Apply an appropriate cutting fluid or tapping compound for the material being threaded. When replacing a worn or broken tap, clear all chips and debris from the hole before starting the new tap.