Hertel K008444AS Spiral Point Tap 3/8-16 Unc Hss

Product Description

The HERTEL K008444AS is a spiral point tap designed for cutting internal threads in through-hole applications. Built from high-speed steel with a bright uncoated finish, this tap produces clean 3/8-16 UNC threads in a single pass by pushing chips forward ahead of the cutting zone rather than backing them out. The plug chamfer provides a gradual lead-in suited to through-hole threading in a wide range of materials. The H5 thread limit maintains tight dimensional control for consistent 2B class fits. This tool is used by machinists, maintenance mechanics, and tool-and-die professionals working in production and repair environments.

The K008444AS is suited for through-hole tapping in steel, cast iron, aluminum, and similar machinable materials where chip evacuation in a forward direction is practical. The 3-flute design balances chip clearance with core strength at this diameter. Typical applications include machine repair, fixture fabrication, and general production threading where a 3/8-16 UNC fastener interface is required. It is intended for use in both hand-tapping and machine-tapping setups with appropriate tapping fluid and feed control.

Key Features

• Spiral point geometry pushes chips forward, keeping the cutting zone clear in through-hole applications
• 3/8-16 UNC thread form with H5 thread limit for consistent 2B class of fit
• 3 flutes provide adequate chip clearance and maintain core integrity at this thread diameter
• Plug chamfer allows gradual engagement, reducing entry load in hand and machine tapping
• High-speed steel construction offers good toughness and resharpening capability
• Bright uncoated finish — no coating build-up concerns when regrinding

Compatibility

Designed for through-hole tapping of 3/8-16 UNC threads. Compatible with standard 3/8-inch tap holders and chucks sized for this shank. Right-hand rotation and feed direction required.

Installation Notes

This tap is installed by a machinist or maintenance mechanic using a tap wrench, drill press, or CNC tapping cycle with rigid or floating tap holder. Always drill the correct tap drill diameter for 3/8-16 UNC before threading, and apply appropriate cutting fluid for the workpiece material. Ensure the tap enters the hole square to the workpiece surface to avoid thread runout or tap breakage. Power down and secure the workpiece before beginning any tapping operation on machine tools.