Accupro T1620623 Spiral Point Tap 9/16-18 Plug Hss

Product Description

The ACCUPRO T1620623 is a spiral point plug tap designed for threading operations in stainless steel and similarly tough materials. Built from 3% Vanadium High Speed Steel (HSS) with an oxide finish, this tap handles the heat and friction generated when cutting through harder workpieces. The plug chamfer provides a gradual thread lead-in across several starting threads, making it suitable for through-hole tapping applications. With a 9/16-18 UNF thread profile, 3 flutes, and an H3 thread limit, this tap delivers consistent, close-tolerance threads in production and repair environments. Overall length is 3.5938 inches with a 30 mm thread length.

This tap is sized for 9/16-18 unified fine thread work, commonly encountered in automotive, mechanical, and industrial fabrication. The spiral point geometry pushes chips forward ahead of the cutting zone, which is well suited for through-hole tapping on CNC machines and manual tapping equipment. Material application is noted for stainless steel, where the vanadium-enhanced HSS maintains cutting edge hardness under elevated temperatures. Right-hand thread direction is standard. Machinists, tool-and-die makers, and maintenance technicians working on ferrous and stainless components will find this tap appropriate for both production runs and field repair.

Key Features

• 9/16-18 UNF thread size for unified fine thread applications
• 3% Vanadium High Speed Steel construction for improved heat and wear resistance
• Spiral point geometry pushes chips forward, ideal for through-hole tapping
• Plug chamfer provides gradual thread engagement at the start of the cut
• Oxide finish reduces friction and provides light corrosion resistance during use
• H3 thread limit for close-tolerance thread production

Compatibility

Designed as a replacement or production-run spiral point tap for through-hole tapping operations requiring a 9/16-18 UNF right-hand thread in stainless steel and similar materials.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a tap wrench, tapping head, or CNC rigid tapping cycle. Always use appropriate cutting fluid rated for stainless steel to reduce heat buildup and extend tool life. Secure the workpiece firmly before tapping to prevent tap breakage. Inspect the tap for wear or chipping before each use, as a dull cutting edge increases the risk of tap failure in hard materials.