Accupro T2640525 Spiral Point Tap 7/16-14 3 Flute

Product Description

The ACCUPRO T2640525 is a spiral point plug tap designed for threading 7/16-14 unified coarse (UNC) holes in steel workpieces. It features three flutes and a plug chamfer, which allows the tap to start easily in a through-hole and push chips forward ahead of the cutting edge rather than packing them in the flute. The body is ground from 3 percent vanadium high-speed steel, providing increased wear resistance and edge retention over standard M2 HSS when tapping alloy and carbon steels. Overall length is 3.1563 inches with a thread length of 25 millimeters and a shank diameter of 8.20 millimeters. The bright, uncoated finish suits general-purpose applications where no specialized coating is required.

This tap is suited for production and maintenance machining environments where 7/16-14 UNC internal threads are required in steel. Typical applications include threading drilled-through holes in structural components, brackets, fixtures, and general fabrication work. The spiral point geometry makes it most effective in through-hole applications where chip ejection is critical to thread quality and tool life. It is used in manual tap handles, drill press setups, and CNC tapping cycles with rigid or floating tap holders.

Key Features

• Spiral point geometry pushes chips forward, ideal for through-hole tapping in steel
• 3 percent vanadium high-speed steel construction for improved wear resistance over standard HSS
• Plug chamfer provides easy starting and full thread form over the chamfer length
• H5 thread limit for consistent fit within standard tolerance ranges
• Bright, uncoated finish for general-purpose steel tapping applications
• Right-hand thread direction, compatible with standard tapping setups

Compatibility

Designed for threading 7/16-14 UNC through-holes in steel materials. Suitable for use with standard tap handles, drill press tap attachments, and CNC rigid tapping setups that accept an 8.20 millimeter shank diameter.

Installation Notes

Machining professionals and maintenance technicians should ensure the workpiece is securely clamped and the pilot hole is drilled to the correct tap drill diameter for 7/16-14 UNC threads before use. Apply appropriate cutting fluid or tapping compound when threading steel to extend tool life and improve thread finish. For CNC applications, verify spindle speed and feed rate match the tool manufacturer recommendations for the material and tap size. Inspect the tap for wear or chipping regularly, as a damaged tap can produce out-of-tolerance threads or break in the hole.