Hertel K008394AS Spiral Point Tap 5/16-18 Unc 2 Flutes

Product Description

The HERTEL K008394AS is a spiral point tap designed to cut right-hand internal threads in through-hole applications. Built from high-speed steel with a bright, uncoated finish, this tap measures 5/16-18 UNC and features two flutes with a plug chamfer that guides the tap into the workpiece and pushes chips forward ahead of the cut. The H5 thread limit and 2B class of fit make it well suited for standard commercial threading tolerances. Machinists and tool-and-die technicians rely on spiral point taps for production tapping in drills, tapping heads, and CNC machines where chip evacuation in through-holes is a priority.

This tap is used in metal fabrication, maintenance and repair, and production machine shop environments. It is appropriate for threading through-holes in steel, iron, aluminum, and similar machinable materials where a 5/16-18 UNC thread form is required. The plug chamfer, with its moderate lead, makes it a general-purpose choice for both hand tapping and machine tapping setups. It is sold individually and sized for standard 5/16-18 toolholders and tap wrenches.

Key Features

• 5/16-18 UNC thread form for standard inch-series fastener applications
• High-speed steel construction provides good wear resistance across a range of workpiece materials
• Plug chamfer with 2 flutes pushes chips forward, ideal for through-hole tapping
• H5 thread limit with 2B class of fit meets common commercial threading tolerances
• Right-hand thread direction, bright uncoated finish
• No coolant-through feature; suitable for external flood coolant or tapping fluid applications

Compatibility

Designed as an OEM-style replacement or direct-use spiral point tap for standard 5/16-18 UNC through-hole tapping operations in compatible tap wrenches, tapping heads, and CNC toolholders sized for this thread and shank diameter.

Installation Notes

A licensed machinist or qualified tradesperson should verify correct tap drill size and hole depth before use. Always secure the workpiece and ensure the tap is properly aligned to avoid breakage. Apply appropriate tapping fluid or cutting oil to extend tap life and improve thread quality. Never reverse a broken tap without proper extraction tools, and follow applicable shop safety procedures when operating machine tooling.