Guhring 9044075254000 Spiral Flute Tap Unc 1-8 Cobalt

Product Description

The GUHRING 9044075254000 is a spiral flute tap designed for cutting 1-8 UNC internal threads in a wide range of metallic workpiece materials. Built from cobalt high-speed steel with an oxide finish, it delivers improved heat and wear resistance compared to standard HSS taps. The modified bottoming chamfer allows threading closer to the bottom of blind holes than a standard plug tap while still offering guided entry. It carries a 2B/3B class of fit and an H5 thread limit, suiting both standard and close-tolerance threading applications. A 40-degree helix angle evacuates chips efficiently in the right-hand flute direction, reducing chip packing in deep or interrupted cuts. Licensed machinists, toolroom technicians, and maintenance mechanics are the primary users.

This tap is rated for use on alloy steel, alloy tool steel, aluminum alloy, case-hardened steel, cast iron, ductile iron, free-cutting steel, heat-treated steel, malleable cast iron, stainless steel, structural steel, and tool steel. It fits production and job-shop environments where 1-8 UNC threads are machined in blind-hole configurations on CNC machining centers, manual mills, or drill presses equipped with a tapping head. Coolant-through is not supported on this tap, so external flood or mist coolant should be used when tapping heat-sensitive materials.

Key Features

• Cobalt HSS construction resists heat buildup during tapping of tough and abrasive alloys
• 40-degree right-hand helix angle promotes upward chip evacuation in blind holes
• Modified bottoming chamfer enables threading close to the bottom of blind bores
• H5 thread limit and 2B/3B class of fit support standard and close-tolerance UNC thread requirements
• Oxide finish provides corrosion resistance and reduces galling during tapping
• Rated for twelve workpiece material categories including stainless, cast iron, and heat-treated steel

Compatibility

Designed as an OEM-style threading tool for 1-8 UNC blind-hole applications across the material types listed in the specifications; no specific machine model compatibility is stated by the manufacturer for this tap.

Installation Notes

This tap is installed by a machinist or toolroom technician using a standard tap holder, tapping head, or CNC rigid-tapping chuck sized for a 0.8-inch shank diameter. Ensure the workpiece is securely fixtured and the spindle is set to an appropriate tapping speed for the material before engaging the tap. Always apply cutting fluid or flood coolant to reduce friction and extend tool life, particularly when threading stainless steel or heat-treated steel. Inspect the tap for chipping or wear before each use, as a damaged tap can seize in the bore and ruin the workpiece.