Hertel K008416AS Spiral Point Tap 5/16-24 Unf 3 Flute Hss

Product Description

The HERTEL K008416AS is a spiral point tap designed for cutting internal threads in through-hole applications. Built from high speed steel with a bright finish, this plug-chamfer tap is suited for general-purpose threading in ferrous and non-ferrous materials. It produces a 5/16-24 UNF right-hand thread and features a 3-flute spiral point geometry that pushes chips forward ahead of the cutting zone, keeping the flutes clear during the threading operation. The thread length measures 1.125 inches and the shank diameter is 0.318 inches. Machinists and maintenance technicians install this tap by hand or in a tapping machine or CNC setup requiring a standard straight-shank tool holder.

This tap is intended for through-hole threading work in manufacturing, maintenance, and repair environments. The 5/16-24 UNF thread form is a fine-pitch unified thread commonly used in precision fastener applications across automotive, aerospace, and general mechanical assemblies. The plug chamfer provides a gradual lead-in of several threads, making it appropriate for starting in a pre-drilled hole and running through the full depth of a through-hole workpiece. The H2 thread limit designation indicates a tightly controlled tolerance class suitable for standard UNF fit requirements.

Key Features

• 5/16-24 UNF fine-pitch thread form with H2 thread limit for controlled tolerance
• 3-flute spiral point geometry pushes chips forward, keeping flutes clear in through-hole applications
• Plug chamfer for gradual lead-in across several thread starts
• High speed steel construction for durability across a range of workpiece materials
• Bright finish with no coolant-through requirement, compatible with hand tapping and machine tapping setups
• Right-hand thread direction, standard for the majority of threaded fastener applications

Compatibility

Designed as a direct-fit spiral point tap for through-hole applications requiring a 5/16-24 UNF right-hand thread. Compatible with standard straight-shank tap holders and tapping heads that accept a 0.318-inch shank diameter.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tapping wrench, hand tap holder, or machine tapping setup. Always drill the correct tap drill size for the 5/16-24 UNF thread before beginning the tapping operation. Apply appropriate cutting fluid to reduce heat and extend tap life. Back off periodically when hand tapping to break chips, and confirm the workpiece is securely fixtured before applying torque.