Accupro T1640585 Spiral Point Tap 1/2-20 3 Flutes

Product Description

The ACCUPRO T1640585 is a spiral point tap designed for cutting internal threads in through-hole applications. Built from HSS-E vanadium high speed steel with an oxide finish, this tap handles demanding threading operations in ferrous and non-ferrous materials. It cuts a 1/2-20 UNF thread with a right-hand direction and a plug chamfer, making it suited for starting threads in pre-drilled holes where the tap can pass through the workpiece. The H5 thread limit and Class 2B fit designation ensure dimensional accuracy and consistent thread form. With 3 flutes and a spiral point geometry, chips are pushed forward and out of the cutting zone, supporting cleaner cuts at production-level feed rates.

This tap is used in machine shop, manufacturing, and maintenance environments where 1/2-20 UNF through-hole threads are required. It is commonly run in CNC machining centers, drill presses, and tapping machines. Typical applications include threading mild steel, alloy steel, aluminum, and similar workpiece materials. The oxide finish provides a degree of lubricity and surface protection suited for general-purpose production tapping without coolant-through capability.

Key Features

• 1/2-20 UNF thread size with right-hand cutting direction
• HSS-E vanadium high speed steel construction for improved wear resistance over standard HSS
• Plug chamfer style for through-hole threading applications
• 3-flute spiral point geometry pushes chips forward for cleaner cutting action
• H5 thread limit with Class 2B fit for consistent, accurate thread production
• Oxide finish provides surface lubricity for general-purpose tapping

Compatibility

Designed as an OEM-style replacement spiral point tap for use in standard 1/2-20 UNF through-hole tapping operations across general machining and maintenance applications.

Installation Notes

This tap is installed and operated by machinists and tooling technicians using a tapping machine, CNC machining center, or hand tap wrench. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for a 1/2-20 thread before beginning. Use appropriate cutting fluid or tapping oil to extend tool life and improve thread finish. Do not reverse the tap under power without confirming machine compatibility with the spiral point geometry.