Accupro T1640405 Spiral Point Tap 1/4-20 3 Flute

Product Description

The ACCUPRO T1640405 is a spiral point tap designed for cutting right-hand internal threads in through-hole applications. Built from HSS-E vanadium high speed steel with an oxide finish, it delivers reliable wear resistance and lubricity in production tapping operations. The plug chamfer style distributes cutting load across the lead threads, making it suitable for through-hole tapping in steel, cast iron, and similar ferrous materials. With a 1/4-20 UNC thread form and a 2B class of fit, this tap produces threads that meet standard fastener tolerance requirements. It is typically installed and used by machinists, tool and die technicians, and maintenance professionals across industrial and commercial applications.

This tap is suited for through-hole tapping in production and maintenance environments where a standard 1/4-20 UNC thread is required. The H5 thread limit designation makes it appropriate for use with standard 2B class fits, which cover the majority of general-purpose threaded fastener assemblies. The oxide coating reduces friction and provides light corrosion resistance during storage and use. It is commonly used in machine shops, MRO operations, and field maintenance settings where consistent thread quality is needed in ferrous workpieces.

Key Features

• 1/4-20 UNC thread form with 2B class of fit for standard fastener compatibility
• HSS-E vanadium construction provides enhanced toughness and wear resistance over standard HSS
• Oxide finish reduces friction and offers light corrosion protection
• Plug chamfer with 3 flutes for efficient chip evacuation in through-hole applications
• H5 thread limit for consistent 2B tolerance across production runs
• Right-hand thread direction, no coolant-through passages required

Compatibility

Designed as a standard replacement spiral point tap for through-hole 1/4-20 UNC tapping operations in ferrous and similar materials where an H5 thread limit and 2B class of fit are specified.

Installation Notes

Use in a tapping head, drill press, CNC machine, or hand tap wrench rated for the workpiece material. Always secure the workpiece firmly and ensure the tap is properly aligned to the drilled hole before engaging. Apply a suitable cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread finish. Inspect the tap for wear or chipping before each use and replace when thread quality degrades.