Hertel K008362AS Spiral Point Tap 1/4-28 Unf 3 Flute Hss

Product Description

The HERTEL K008362AS is a spiral point tap designed for threading 1/4-28 UNF holes in a wide range of materials. Spiral point geometry pushes chips ahead of the cut rather than packing them into the flute, making this tap well suited for through-hole applications where clean chip evacuation matters. Manufactured from high-speed steel with a bright uncoated finish, it carries a plug chamfer and an H2 thread limit for tight, consistent tolerances. Three flutes provide adequate chip clearance while maintaining core strength. Licensed machinists, toolroom technicians, and maintenance mechanics are the typical users.

This tap is used in production and maintenance machining environments wherever a 1/4-28 UNF internal thread is required. The plug chamfer makes it appropriate for starting a thread from scratch in a through hole. It is commonly used on steel, aluminum, brass, and similar machinable metals. The right-hand thread direction is standard for the vast majority of fastener applications. The H2 thread limit suits general-purpose commercial threading work where moderate fit tolerance is acceptable.

Key Features

• Spiral point geometry pushes chips forward for efficient through-hole threading
• High-speed steel construction provides durability across common workpiece materials
• Plug chamfer allows the tap to start and cut threads from the entry face of a through hole
• H2 thread limit delivers consistent tolerance control for standard UNF fits
• Bright uncoated finish is suitable for use with a variety of cutting fluids
• Right-hand cut matches standard 1/4-28 UNF fastener thread direction

Compatibility

Designed as a standard spiral point plug tap for cutting 1/4-28 UNF right-hand internal threads in through-hole machining applications.

Installation Notes

Installation of this tap should be performed by a qualified machinist or maintenance technician. Ensure the workpiece is securely fixtured and the tap is properly aligned with the drilled hole before applying torque to avoid tap breakage. Always use an appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality. De-burr the hole entry before tapping and back the tap out periodically to clear chips when working in deeper through holes.