Guhring 9039260063500 Spiral Point Tap 1/4-28 Unf Hss-e

Product Description

The GUHRING 9039260063500 is a spiral point tap designed for through-hole threading in non-ferrous metal applications. Part of the Guhring Series 3926, it cuts a 1/4-28 UNF right-hand thread with a plug chamfer and a 2B class of fit. The tap is manufactured from HSS-E cobalt high-speed steel and carries a bright, uncoated finish. With 3 flutes and a thread limit of H3/H4, it delivers consistent thread tolerance across production and maintenance threading operations. Machinists and mechanical tradespeople rely on this configuration for clean, accurate internal threads in through-hole bores where chip evacuation forward is advantageous.

This tap is suited for threading non-ferrous metals in through-hole applications, including general manufacturing, maintenance, and repair work. The spiral point geometry pushes chips ahead of the cut rather than packing them in the flutes, making it well-matched for CNC machines, turret lathes, and hand-tapping fixtures where continuous chip flow is needed. The plug chamfer provides a moderate lead-in, appropriate for starting in a pre-drilled hole with reasonable alignment. It is a standard selection for shops requiring a reliable 1/4-28 UNF tap in cobalt HSS-E for aluminum, copper, brass, and similar non-ferrous workpiece materials.

Key Features

• 1/4-28 UNF thread form with right-hand cut and 2B class of fit
• HSS-E cobalt construction for improved wear resistance over standard HSS
• Spiral point geometry advances chips forward, reducing clogging in through-hole threading
• Plug chamfer provides a standard lead-in suitable for most through-hole setups
• H3/H4 thread limit for consistent tolerance control
• Bright, uncoated finish — no coating buildup concerns on close-tolerance threads

Compatibility

Designed for through-hole threading of non-ferrous metals. Fits standard 1/4-28 UNF tapping applications where a spiral point, plug chamfer, 2B class of fit tap is specified. Verify holder and tap wrench collet sizing against the 0.255-inch shank diameter before installation.

Installation Notes

Installation should be performed by a qualified machinist or mechanical technician. Ensure the workpiece is fully secured and the pre-drilled tap hole diameter matches the recommended drill size for a 1/4-28 UNF thread before beginning. Use appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. Inspect the tap for chipping or wear before each use and replace if damaged, as a worn tap can seize and break in the bore.