Hertel K008417AS Spiral Point Tap 5/16-24 Unf 2 Flute

Product Description

The HERTEL K008417AS is a spiral point tap designed for threading 5/16-24 UNF internal threads in a range of metalworking and fabrication applications. Built from high-speed steel with a bright uncoated finish, this tap features a plug chamfer and two flutes arranged in a spiral point geometry. The spiral point design pushes chips ahead of the cutting edge rather than back through the flutes, making it well suited for through-hole threading operations. Right-hand thread direction and an H2 thread limit provide controlled tolerances appropriate for standard UNF fastener fits. Machinists, tool-and-die workers, and maintenance technicians across manufacturing and repair environments regularly rely on this tap type.

This tap is used in through-hole threading of steel, aluminum, cast iron, and similar materials where a 5/16-24 UNF thread form is required. The plug chamfer — typically 3 to 5 threads of taper — allows the tap to start in a pre-drilled hole without requiring a starter tap. Its compact size and standard shank geometry make it compatible with tap handles, tapping heads, and CNC or manual drill press setups. It is well suited for production threading, maintenance and repair operations, and general machine shop work.

Key Features

• 5/16-24 UNF thread form for fine-pitch threading in through holes
• High-speed steel construction provides durability across a wide range of workpiece materials
• Spiral point geometry drives chips forward, reducing clogging in through-hole applications
• Plug chamfer for easy hole entry without a separate starter tap
• H2 thread limit for consistent, close-tolerance UNF thread fits
• Bright uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed as a standard spiral point tap for through-hole threading applications requiring a 5/16-24 UNF thread form. Fits standard tap holders and tapping chucks sized for the corresponding shank diameter.

Installation Notes

Use of cutting fluid or tapping compound is recommended to reduce heat and extend tap life. Ensure the workpiece hole is drilled to the correct tap drill size for a 5/16-24 UNF thread before tapping. Secure the workpiece firmly before operation to prevent movement that can break the tap. Reverse the tap periodically during hand tapping to break chips and reduce torque buildup.