Guhring 9039080063500 Spiral Point Tap 1/4-28 Unf Tin

Product Description

The GUHRING 9039080063500 is a spiral point tap designed for through-hole threading in 1/4-28 UNF applications. Built from High-Speed Steel-E-PM (powder metallurgy HSS) with a TiN (titanium nitride) coating, this tap delivers extended tool life and reduced friction in demanding materials. The plug chamfer provides gradual thread engagement, and the 3-flute geometry pushes chips forward ahead of the cutting zone, making it well-suited for through-hole work. The 2B class of fit produces standard commercial-tolerance threads. Overall length is 2.5 inches with a thread length of 0.63 inches. Licensed machinists, pipefitters, and maintenance technicians working in precision threading operations are the primary installers.

This tap is rated for threading stainless steel and similarly tough ferrous materials where tool wear is a common issue. The H3/H4 thread limit designation suits 2B-class through-hole work at 1/4-28 UNF. It is used in production and maintenance settings where consistent thread quality in hard-to-machine materials is required. The right-hand thread direction and spiral point style are standard for machine tapping operations, though the tap can also be used with a tap handle in manual applications where torque control is carefully managed.

Key Features

• Spiral point (gun tap) geometry pushes chips forward, ideal for through-hole threading
• High-Speed Steel-E-PM substrate provides superior wear resistance over standard HSS
• TiN coating reduces friction and extends tool life in stainless steel and hard alloys
• Plug chamfer (3-5 thread lead) allows gradual cutting engagement
• H3/H4 thread limit produces 2B-class fits for standard commercial thread tolerance
• Right-hand cut, no coolant-through requirement, non-interrupted thread design

Compatibility

Designed for through-hole threading of 1/4-28 UNF threads in stainless steel and comparable hard materials. Fits standard 1/4-inch tap holders and collet chucks sized for a 0.255-inch shank diameter.

Installation Notes

Machine tapping is the preferred method; use a tapping-rated CNC machine or drill press with a floating tap holder to prevent breakage from misalignment. Ensure the workpiece is securely fixtured and the pilot hole diameter is correct for a 2B-class 1/4-28 UNF thread before beginning. Apply a suitable cutting fluid or tapping compound, particularly when working in stainless steel, to reduce heat buildup and galling. Follow shop safety practices and applicable OSHA machine-guarding requirements when operating tapping equipment.