Guhring 9048855063500 Spiral Point Tap 1/4-20 Unc

Product Description

The GUHRING 9048855063500 is a spiral point tap designed for through-hole threading in steel and similar materials. It features a 1/4-20 UNC thread form with a plug chamfer, making it suitable for starting threads in through-holes where chips are pushed forward ahead of the tap. Built from HSS-E cobalt high-speed steel and finished with a GUHRING Ignator coating, it delivers improved wear resistance and heat tolerance compared to standard HSS taps. The 3-flute design and H4/H5 thread limit support accurate thread production in both 2B and 3B class-of-fit applications. Overall length is 2.5 inches with a 0.630-inch thread length.

This tap is intended for through-hole threading operations in steel workpieces across general machining, fabrication, and maintenance applications. It fits standard tap holders and machine spindles sized for the 0.255-inch shank diameter. The plug chamfer makes it best suited for through-holes rather than blind holes. Series 4885 identifies this as part of a consistent GUHRING product family for inch-thread spiral point taps used in production and repair environments.

Key Features

• 1/4-20 UNC thread form with plug chamfer for through-hole threading
• HSS-E cobalt construction for improved toughness and heat resistance over standard HSS
• Ignator coating reduces friction and extends tool life in steel applications
• H4/H5 thread limit supports 2B and 3B class-of-fit tolerances
• Right-hand, 3-flute spiral point design pushes chips forward through the hole
• No coolant-through requirement — suitable for conventional flood or dry tapping setups

Compatibility

Designed for through-hole threading in steel applications. Compatible with standard tap holders accepting a 0.255-inch shank diameter. Produces 1/4-20 UNC threads to 2B and 3B class-of-fit tolerances.

Installation Notes

This tap is installed and operated by a machinist or maintenance technician using a tapping machine, drill press, CNC machining center, or hand tap wrench. Ensure the workpiece is securely fixtured and the spindle is properly aligned with the hole before tapping. Apply appropriate cutting fluid for the material being tapped. Do not use this plug-chamfer tap in blind holes where chip evacuation is restricted, as chip packing can cause tap breakage.