Accupro T1620662B Spiral Point Tap 5/8-18 3 Flutes

Product Description

The ACCUPRO T1620662B is a spiral point tap designed for cutting right-hand internal threads in through-hole applications. Built from 3% vanadium high speed steel with an oxide finish, this tap delivers improved wear resistance and lubricity compared to standard HSS. It cuts a 5/8-18 UNF thread to a Class 2B tolerance using a plug chamfer, which makes it suited for most general-purpose tapping where a full-thread start is not required. Overall length is 3.8125 inches with a thread length of approximately 1.26 inches, and a shank diameter of 0.48 inches. Licensed machinists and toolroom technicians are the primary users of this tap in production and maintenance environments.

This tap is intended for tapping through holes in stainless steel and similar work materials where a spiral point design is preferred. The spiral point geometry pushes chips forward ahead of the tap, keeping the flutes clear and reducing the risk of chip packing. It is well suited for CNC machining centers, turret lathes, and manual drill presses equipped with tapping attachments. The plug chamfer provides a gradual thread start over several threads, making it appropriate for through-hole work in both production runs and single-piece maintenance tasks.

Key Features

• 5/8-18 UNF thread size with Class 2B tolerance for standard fit applications
• Plug chamfer for gradual thread engagement in through-hole tapping
• 3% vanadium high speed steel construction for enhanced wear resistance over standard HSS
• Oxide finish improves lubricity and reduces galling, especially in stainless steel
• Spiral point geometry pushes chips forward to keep flutes clear during cutting
• Right-hand thread direction for standard tapping operations

Compatibility

Designed as an OEM-style cutting tool for use in standard 5/8-18 UNF through-hole tapping operations. No specific machine compatibility data was provided by the manufacturer for this part number.

Installation Notes

This tap should be installed in a tap holder or chuck rated for the shank diameter before use. Ensure the workpiece is securely fixtured and that the spindle is properly aligned to prevent tap breakage. Use an appropriate cutting fluid for stainless steel applications to extend tool life and improve surface finish. Always bring the machine to a complete stop before removing or changing the tap.