Accupro T1620583 Spiral Point Tap 1/2-20 3 Flutes Plug

Product Description

The ACCUPRO T1620583 is a spiral point tap designed for threading 1/2-20 UNF holes in production and job-shop machining environments. It features a plug chamfer with 3 flutes and is manufactured from 3% Vanadium High Speed Steel, which provides increased wear resistance and edge retention compared to standard M2 HSS. The oxide finish reduces friction and offers light corrosion protection during storage and use. With a Class 3B thread fit and H3 thread limit, this tap holds tighter tolerances suitable for precision threading applications. It is installed by machinists, toolmakers, and CNC operators working in manual or power-feed tapping setups.

This tap is suited for threading through-holes in stainless steel and other difficult-to-machine ferrous materials where chip evacuation is a priority. The spiral point geometry pushes chips ahead of the tap and down through the hole, making it effective for through-hole applications on machining centers, drill presses, and tapping machines. With an overall length of 3.38 inches and a thread length of approximately 1.14 inches, it fits standard tap holders and collet chucks used in general machine shop work. Right-hand thread direction matches the most common threading operations.

Key Features

• 1/2-20 UNF thread size with H3 thread limit for Class 3B fit tolerance control
• 3% Vanadium High Speed Steel construction for improved wear resistance over standard HSS
• Spiral point geometry pushes chips forward through the hole, ideal for through-hole threading
• Plug chamfer with 3 to 5 lead threads allows gradual thread engagement
• Oxide finish reduces galling and provides light lubricity during cutting
• Right-hand thread direction, no coolant-through feature

Compatibility

Designed for through-hole tapping in stainless steel as noted in the supplier material application data. Fits standard 1/2-inch tap holders, tapping heads, and collet chucks used on machining centers and manual tapping equipment. No specific machine model compatibility was stated in the input data.

Installation Notes

This tap should be installed by a qualified machinist or toolroom professional. Ensure the workpiece is fully secured and the tapping machine or drill press is powered down before changing tooling. Use appropriate cutting fluid or tapping compound rated for stainless steel to reduce tool wear and prevent galling. Follow ANSI B94.9 tap standards for recommended speeds and feeds based on material hardness and machine type.