Accupro T2644445 Spiral Flute Tap 5/16-18 2 Flute

Product Description

The ACCUPRO T2644445 is a spiral flute tap designed for cutting 5/16-18 unified coarse internal threads in production and maintenance machining environments. Built from 3% Vanadium High Speed Steel, 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. With a fast-helix 40-degree flute angle, chips are efficiently pulled up and out of the hole, reducing packing and tap breakage. Licensed machinists and tool-room technicians are the primary users of this tool.

This tap is suited for threading aluminum and similar non-ferrous materials in both manual and CNC tapping applications. The 2B class of fit produces a standard commercial-tolerance thread suitable for most fastener assembly and repair work. The H5 thread limit designation confirms the ground-thread tolerance for close-tolerance production runs. With a 2-flute design, chip clearance is maximized in softer materials, making it a practical choice for job-shop and production work on aluminum workpieces.

Key Features

• Modified bottoming chamfer for threading near the bottom of blind holes
• 40-degree helix angle pulls chips up and out, reducing tap breakage
• 3% Vanadium HSS construction for extended edge life versus standard HSS
• H5 ground-thread tolerance for consistent 2B class of fit
• 2-flute design maximizes chip clearance in aluminum and soft materials
• Bright/uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed for cutting 5/16-18 UNC internal threads; optimized for aluminum material applications as specified by the manufacturer.

Installation Notes

This tap should be installed in a tap handle, tapping head, or CNC rigid-tapping chuck rated for the shank diameter. Always use an appropriate cutting fluid for the workpiece material. Secure the workpiece firmly before tapping to prevent movement that can cause tap breakage. Inspect the tap for chipping or wear before each use and replace when cutting feel or thread quality degrades.