Accupro T1640165 Spiral Point Tap 4-40 3 Flutes Plug

Product Description

The ACCUPRO T1640165 is a spiral point tap designed for cutting internal 4-40 unified coarse threads in through-hole applications. Made from HSS-E vanadium high speed steel with an oxide finish, it offers improved wear resistance and heat tolerance compared to standard HSS taps. The plug chamfer style provides a gradual lead-in that distributes cutting forces across several threads, making it well suited for production tapping and repetitive operations. With 3 flutes and a right-hand thread direction, this tap pushes chips ahead of the cut, keeping the flutes clear in through-hole work. It is sized for use with standard machine tapping equipment and manual tap handles.

This tap is used in machine shops, maintenance and repair operations, and light manufacturing environments where 4-40 threaded holes are required in through-hole configurations. The 4-40 thread size is common in small fastener and instrument applications, including electrical enclosures, electronic assemblies, and light-duty mechanical components. It is appropriate for use in ferrous and non-ferrous metals as well as some plastics. The H5 thread limit designation suits applications requiring standard tolerance fits.

Key Features

• HSS-E vanadium high speed steel construction for extended tool life over standard HSS
• Oxide finish reduces friction and improves lubrication retention during cutting
• Plug chamfer distributes cutting load across multiple thread leads
• Spiral point geometry pushes chips forward, suited for through-hole tapping
• H5 thread limit for standard tolerance 4-40 threaded holes
• Right-hand thread direction, compatible with standard tapping equipment

Compatibility

Designed for cutting 4-40 unified coarse right-hand internal threads in through-hole applications across ferrous metals, non-ferrous metals, and select plastics.

Installation Notes

This tap should be installed in a tap holder, tapping chuck, or manual tap wrench appropriate for the shank diameter. Secure the workpiece before tapping and use a suitable cutting fluid or tapping compound to extend tool life and improve thread quality. Ensure proper alignment between the tap and the pilot hole to avoid tap breakage. Follow applicable shop safety procedures when operating tapping equipment.