Hertel K008366AS Spiral Point Tap 1/4-28 Unf Hss

Product Description

The HERTEL K008366AS is a spiral point tap designed for cutting internal threads in through-hole applications. It features a 1/4-28 UNF thread form with a plug chamfer and 2-flute spiral point geometry that pushes chips forward and out of the hole during cutting. Built from high-speed steel with a bright, uncoated finish, this tap is suited for general-purpose threading in a wide range of workpiece materials. The H4 thread limit and 2B class of fit make it appropriate for standard commercial and industrial fastener thread tolerances. Thread length is 1 inch with a right-hand thread direction. Machinists, maintenance technicians, and fabrication shops are the primary users.

This tap is used for threading through-holes in ferrous and non-ferrous materials in production and maintenance environments. The spiral point design is particularly effective in through-hole work where chip evacuation is critical to thread quality and tap longevity. Common applications include fabrication shops, MRO maintenance work, and light manufacturing where 1/4-28 UNF fasteners are standard. The plug chamfer provides a gradual lead-in, making it suitable for both machine and hand tapping operations.

Key Features

• 1/4-28 UNF thread form with 2B class of fit for standard commercial thread tolerances
• Spiral point geometry pushes chips forward, reducing clogging in through-hole applications
• H4 thread limit for consistent tolerance control
• Plug chamfer for gradual thread engagement and lead-in
• High-speed steel construction for durability across general-purpose materials
• Right-hand thread direction, no coolant-through required

Compatibility

Designed as an OEM-style replacement or standard production tap for through-hole applications requiring 1/4-28 UNF right-hand internal threads with a 2B class of fit.

Installation Notes

Installation should be performed by a machinist or qualified maintenance technician using appropriate tapping equipment or a tapping handle. Ensure the workpiece is securely fixtured and the tap is properly aligned with the drilled hole before engagement to prevent tap breakage. Apply suitable cutting fluid for the workpiece material to extend tap life and improve thread finish. Inspect the tap for wear or damage before each use and replace if cutting edges show signs of chipping or dullness.