Accupro T1640505 Spiral Point Tap 3/8-24 Plug Hss-e

Product Description

The ACCUPRO T1640505 is a spiral point tap designed to cut 3/8-24 UNF threads in through-hole applications. It features a plug chamfer, three flutes, and a right-hand thread direction. Built from HSS-E vanadium high speed steel with an oxide finish, this tap handles a wide range of ferrous and non-ferrous materials where toughness and edge retention matter. With an H5 thread limit, it holds tight tolerances suitable for precision threading work. Overall length is 2.937 inches with a thread length of 0.945 inches. Machinists and tool-room technicians use this tap in production and maintenance environments alike.

This tap is suited for through-hole threading in manual, CNC, and automatic tapping setups where chip ejection forward is preferred over chip evacuation backward. The spiral point geometry pushes chips ahead of the cut, reducing jamming risk and allowing higher feed rates compared to hand-tap styles. It is a standard choice for threading steel, cast iron, and similar materials in general machining, automotive, and MRO applications. Coolant-through capability is not included in this configuration.

Key Features

• 3/8-24 UNF thread size for fine-pitch through-hole applications
• HSS-E vanadium high speed steel construction for improved toughness and wear resistance over standard HSS
• Oxide finish provides mild lubricity and corrosion resistance during service
• Plug chamfer (3-5 thread lead) eases entry and distributes cutting load across multiple threads
• H5 thread limit for controlled tolerance fit in precision threading work
• Spiral point geometry ejects chips forward, keeping flutes clear in through-hole cuts
• Right-hand thread direction, standard for the majority of threaded fastener applications

Compatibility

Designed as an OEM-style replacement or direct-use spiral point tap compatible with standard 3/8-inch tap holder collets and tapping heads accepting a 0.381-inch shank diameter.

Installation Notes

This tap should be installed by a qualified machinist familiar with threading operations and proper speeds and feeds for the workpiece material. Always secure the tap in a properly sized collet or tap holder to prevent runout and breakage. Ensure the workpiece is rigidly clamped and the pilot hole is drilled to the correct tap drill size for 3/8-24 UNF threads before tapping. Apply an appropriate cutting fluid for the material being threaded to extend tap life and improve thread finish.