Accupro T1640465 Spiral Point Tap 5/16-24 3 Flute Plug

Product Description

The ACCUPRO T1640465 is a spiral point tap designed for cutting right-hand internal threads in through-hole applications. It features a 5/16-24 UNF thread form, three flutes, and a plug chamfer that provides a gradual lead-in for controlled thread engagement. Manufactured from HSS-E Vanadium high speed steel with an oxide finish, this tap offers improved hardness and wear resistance compared to standard HSS tooling. With an H5 thread limit, it is suited for applications requiring a close-tolerance fit. Typical users include machinists, maintenance technicians, and industrial tradespeople working with ferrous and non-ferrous materials.

This tap is intended for through-hole tapping operations in production and maintenance environments. The spiral point design pushes chips forward ahead of the tap, making it effective in CNC and hand-tapping setups where chip clearance is a priority. The plug chamfer — typically 3 to 5 threads — allows the tap to start easily in pre-drilled holes. Coolant-through capability is not included, so external cutting fluid or tap lubricant is recommended when machining steel or stainless materials to extend tool life and maintain thread quality.

Key Features

• 5/16-24 UNF thread size for fine-pitch through-hole tapping
• HSS-E Vanadium construction for enhanced hardness and wear resistance over standard HSS
• Oxide finish reduces friction and provides mild corrosion resistance during storage
• Plug chamfer provides gradual thread engagement, suitable for most general through-hole applications
• H5 thread limit ensures close-tolerance thread fit
• Right-hand thread direction; three-flute design promotes efficient chip evacuation in through-holes

Compatibility

Designed as a standard replacement spiral point tap for through-hole tapping operations requiring a 5/16-24 UNF thread form in manual or CNC machining applications.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap wrench, tapping head, or CNC rigid tapping cycle. Always ensure the pilot hole is drilled to the correct tap drill diameter for a 5/16-24 thread before starting. Apply cutting fluid or tapping compound to extend tool life and improve thread finish, particularly in steel and stainless steel. Power down or de-energize any machine fully before changing tooling in a manual setup.