Hertel K008471AS Spiral Flute Tap 3/8-24 Unf Hss

Product Description

The HERTEL K008471AS is a spiral flute plug tap designed for threading 3/8-24 UNF internal threads in a variety of ferrous and non-ferrous workpiece materials. Built from high speed steel (HSS), this tap features a 52-degree helix angle that evacuates chips upward and out of the hole, making it well-suited for through-hole and blind-hole applications where chip management is critical. The plug chamfer provides a gradual thread start across the first few leading threads. Thread limit is H3, and the class of fit is 3B, meeting standard UNF tolerance requirements for precision threaded assemblies.

This tap is used in machining, maintenance, repair, and fabrication environments where 3/8-24 UNF threaded holes are required. The spiral flute geometry performs well in softer steels, aluminum, brass, and plastics. It is appropriate for use in CNC machining centers, drill presses, and manual tapping operations. With an overall length of 2-15/16 inches, it fits standard tap holders and quick-change chucks used in production and job-shop settings.

Key Features

• 52-degree helix angle promotes upward chip evacuation for cleaner blind and through holes
• High speed steel construction provides wear resistance across common workpiece materials
• Plug chamfer eases thread starting with gradual lead-in over first several threads
• H3 thread limit and 3B class of fit for standard UNF precision tolerance
• Right-hand flute and right-hand thread configuration for conventional tapping direction
• No coolant-through requirement - compatible with flood coolant or tapping fluid applied externally

Compatibility

Designed for cutting 3/8-24 UNF internal threads in through-hole and blind-hole applications. Fits standard tap holders, tapping chucks, and collet systems sized for 3/8-inch shank taps.

Installation Notes

Installation and use should be performed by a qualified machinist or maintenance technician familiar with thread-cutting operations. Always use a recommended cutting fluid or tapping compound appropriate to the workpiece material to extend tap life and improve thread quality. Secure the workpiece firmly before tapping and ensure the tap is aligned perpendicular to the surface to prevent tap breakage. Never reverse the tap under power without confirming the machine or holder is set for reverse extraction.