Accupro T1604202B Spiral Flute Tap 5-40 3 Flutes

Product Description

The ACCUPRO T1604202B is a spiral flute tap designed for cutting internal threads in a 5-40 thread size with a 2B class of fit. Built from 3% vanadium high-speed steel with an oxide coating, it delivers reliable wear resistance in production and maintenance threading applications. The modified bottoming chamfer allows threading closer to the bottom of blind holes than a standard taper tap. With 3 right-hand spiral flutes and a 40-degree helix angle, this tap efficiently evacuates chips upward out of the hole during cutting. Overall length is 1.9400 inches with a thread length of 6 mm. Licensed machinists, toolroom technicians, and precision fabricators are the primary users.

This tap is suited for threading small-diameter blind holes in light metals, plastics, and mild steels where chip evacuation is critical to thread quality. The spiral flute design is especially effective in CNC tapping centers and manual drill press operations where consistent chip flow reduces tap breakage risk. The 5-40 thread specification is common in instrument hardware, electronics enclosures, and small mechanical assemblies. The oxide finish provides a mild level of lubricity and corrosion resistance during use and storage.

Key Features

• 5-40 thread size with 2B class of fit for standard tolerance internal threads
• 3% vanadium high-speed steel construction for increased wear resistance over standard HSS
• Modified bottoming chamfer for threading close to the bottom of blind holes
• 40-degree right-hand helix angle promotes upward chip evacuation in blind hole applications
• Oxide coating adds surface lubricity and protects against corrosion during storage
• Compact overall length of 1.9400 inches suits restricted-access applications

Compatibility

Designed as a direct-use threading tool for machines and tap holders accepting a 3.58 mm shank diameter, suitable for 5-40 right-hand thread applications in CNC tapping centers, drill presses, and manual tapping fixtures.

Installation Notes

Always ensure the workpiece is securely fixtured and the spindle or tap handle is properly aligned before beginning the threading operation. Use an appropriate cutting fluid or tapping oil for the workpiece material to extend tap life and improve thread finish. Inspect the tap for chipping or wear before each use, as a damaged tap can seize in the hole and cause workpiece damage. Follow machine tool manufacturer guidelines for spindle speed and feed rate when using in powered tapping equipment.