Hertel K008331AS Spiral Point Tap 1/4-20 Unc 2 Flute Hss

Product Description

The HERTEL K008331AS is a spiral point tap designed for cutting internal threads in through-hole applications. Manufactured from high-speed steel with a bright uncoated finish, this plug-chamfer tap drives chips forward ahead of the cut, keeping the flute area clear and allowing faster feed rates compared to hand-tap styles. The 1/4-20 UNC thread form is one of the most common unified coarse-thread sizes in industrial and maintenance work. With two flutes and an H2 thread limit, this tap suits general-purpose threading in steel, cast iron, aluminum, and similar materials. It is a standard shop tool used by machinists, maintenance technicians, and tool-room personnel.

This tap is suited for production and job-shop threading of through holes in a wide range of ferrous and non-ferrous workpiece materials. The plug chamfer — typically 3 to 5 threads — allows the tap to start easily and maintains cutting continuity throughout the hole depth. It performs in both hand-tapping and machine-tapping setups, including drill presses, CNC machining centers, and tapping arms. The H2 thread limit produces a standard-tolerance fit appropriate for most general fastener and assembly applications.

Key Features

• Spiral point geometry pushes chips forward, reducing clogging in through-hole threading
• High-speed steel construction provides toughness and wear resistance across common workpiece materials
• Bright uncoated finish allows easy visual inspection for wear or damage
• Plug chamfer for straightforward starting and consistent thread engagement
• H2 thread limit delivers standard-tolerance 1/4-20 UNC threads suitable for general assembly
• Right-hand cut, compatible with standard clockwise-rotation tapping setups

Compatibility

Designed as a standard 1/4-20 UNC spiral point tap for use in conventional tap holders, floating tap holders, and tapping chucks that accept unified-shank tooling appropriate for this thread size.

Installation Notes

Threading operations should be performed by a qualified machinist or maintenance technician following established shop safety practices. Always secure the workpiece fully before beginning the tapping cycle, and ensure the tap is properly aligned with the drilled pilot hole to prevent tap breakage. Use an appropriate cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread quality. When machine tapping, verify spindle speed and feed rate are set to values appropriate for the tap diameter and workpiece material before starting the cycle.