Hertel K008324AS Straight Flute Tap 1/4-20 Unc Hss

Product Description

The HERTEL K008324AS is a straight flute tap designed for cutting 1/4-20 UNC internal threads in a wide range of materials. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap delivers consistent thread quality in hand-tap and machine-tap applications. The plug chamfer style provides a moderate lead-in, making it suitable for through-holes and deeper blind holes where some lead-in length is acceptable. The H3 thread limit and 3B class of fit ensure threads meet standard tolerance requirements for general-purpose fastener applications. Overall length is 2.5 inches, and the tool weighs 0.36 pounds.

This tap is used in metalworking, maintenance, repair, and manufacturing environments where 1/4-20 UNC threaded holes are required. It is appropriate for use in ferrous and non-ferrous metals, including mild steel, aluminum, and similar machinable materials. The right-hand thread direction is standard for the vast majority of 1/4-20 fastener assemblies. It is commonly used by machinists, millwrights, maintenance technicians, and field service professionals working with mechanical assemblies, enclosures, brackets, and equipment frames.

Key Features

• 1/4-20 UNC thread size with right-hand thread direction
• 2-flute straight flute geometry for efficient chip clearance in short-chipping materials
• Plug chamfer provides moderate lead-in for through-holes and deeper blind holes
• H3 thread limit with 3B class of fit for standard general-purpose tolerance
• High-speed steel construction offers durability across a broad range of machinable materials
• Bright, uncoated finish — no added coating to alter tap geometry or cutting action

Compatibility

Designed as a standard replacement or stock tap for any application requiring 1/4-20 UNC internal threads with a plug chamfer style and 3B class of fit tolerance.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap handle, tap wrench, or compatible tapping attachment on a drill press or CNC machine. Always drill the correct tap drill size for 1/4-20 UNC threads before tapping, and ensure the workpiece is securely fixtured. Use an appropriate cutting fluid to extend tap life and improve thread finish. Power down or de-energize any equipment being tapped in the field before beginning work.