Accupro T1620665 Spiral Point Tap 5/8-18 3 Flutes

Product Description

The ACCUPRO T1620665 is a spiral point plug tap designed for cutting right-hand internal threads in through-hole applications. It produces a 5/8-18 UNF thread to a 2B class of fit using three flutes and a plug chamfer that guides the tap into the workpiece progressively. The body is manufactured from vanadium high-speed steel with a 3 percent vanadium grade and finished with an oxide coating that reduces friction and resists heat buildup. Overall length is 3.81 inches and thread length is 32 millimeters. It carries a thread limit of H5, making it suitable for tapping holes where close tolerance control is required.

This tap is rated for use in stainless steel, where the vanadium HSS construction and oxide coating provide the toughness and lubricity needed to handle work-hardening materials. It is appropriate for production and maintenance applications in job shops, fabrication facilities, and industrial maintenance settings. The plug chamfer makes it a standard choice when tapping through holes where chip evacuation through the front of the tap is acceptable. The straight spiral point design pushes chips ahead of the cut rather than backing them out, which keeps the flutes clear during the cut.

Key Features

• 5/8-18 UNF thread size with 2B class of fit for standard tolerance through-hole threading
• Plug chamfer with 3 flutes for progressive thread engagement and forward chip evacuation
• Vanadium high-speed steel construction rated for stainless steel applications
• Oxide coating reduces friction and heat at the cutting edge
• H5 thread limit for consistent close-tolerance thread production
• Right-hand thread direction, no coolant-through requirement

Compatibility

Designed for use in through-hole tapping operations requiring a 5/8-18 UNF right-hand internal thread. Rated for stainless steel material applications as specified by the manufacturer.

Installation Notes

This tap is installed and driven by a qualified machinist or toolmaker using a tapping head, drill press, or CNC machine with appropriate torque control. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for a 5/8-18 thread before starting. Use a cutting fluid or tapping compound compatible with stainless steel to extend tool life and maintain thread quality. Do not reverse the tap before it has completed a full chip-breaking cycle, and inspect flutes for wear or loading between holes.