Hertel K008363AS Spiral Point Tap 1/4-28 Unf 2 Flute

Product Description

The HERTEL K008363AS is a spiral point tap designed for threading 1/4-28 UNF holes in metalworking and machining applications. Also known as a gun tap, the spiral point geometry pushes chips forward ahead of the cutting action, keeping the flutes clear during through-hole tapping operations. Built from high-speed steel with a bright uncoated finish, this tap carries a plug chamfer with an H2 thread limit tolerance, making it suited for standard-tolerance threading work in ferrous and non-ferrous materials. It runs in the right-hand direction and is available as a single unit.

This tap is used in machining, fabrication, and maintenance-repair-operations environments where 1/4-28 UNF threads are required. The plug chamfer provides 3 to 5 lead threads, which makes it appropriate for both through holes and holes with sufficient clearance below the thread depth. Machinists, toolmakers, and millwrights commonly select this tap for production runs and job-shop work on drill presses, CNC machining centers, and manual tapping fixtures. It does not feature coolant-through capability, so it is best suited for conventional cutting fluid application.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole tapping
• 1/4-28 UNF thread size with right-hand cutting direction
• H2 thread limit for standard-tolerance fit
• High-speed steel construction for durability across a range of workpiece materials
• Bright uncoated finish suitable for use with standard cutting fluids
• Plug chamfer provides lead-in threads for easy starting

Compatibility

Designed for use in tapping 1/4-28 UNF through holes in standard machining and fabrication setups where spiral point tooling is specified.

Installation Notes

Installation is performed by qualified machinists or toolmakers using a tapping head, CNC control, or manual tap handle. Secure the workpiece firmly before tapping and ensure the pilot hole diameter is correct for 1/4-28 UNF threads per standard drill-and-tap charts. Apply appropriate cutting fluid for the workpiece material and avoid forcing the tap, which can cause breakage. Reverse periodically when tapping manually to break chips.