Guhring 9039050142880 Spiral Flute Tap 9/16-18 Unf

Product Description

The GUHRING 9039050142880 is a spiral flute tap designed for threading blind holes in a wide range of materials, including steel, aluminum and other non-ferrous metals, gray cast iron, and malleable and spheroidal iron. Built from cobalt high-speed steel with a bright/uncoated finish, this tap features a 40-degree helix angle and a modified bottoming chamfer, allowing it to cut close to the bottom of a blind hole while maintaining chip evacuation efficiency. The 9/16-18 UNF thread form and 2B class of fit make it a standard choice for precision fastener applications in fabrication and maintenance environments. Licensed machinists and tool-and-die professionals are the primary users of this tap.

This tap is suited for blind hole threading operations on manual lathes, CNC machining centers, and tapping machines. Its fast-flute geometry helps pull chips up and out of the hole during the cut, reducing the risk of chip packing in tightly toleranced blind bores. The 3-flute design and cobalt construction support use in interrupted cuts and harder steels where standard HSS taps show premature wear. The right-hand thread and right-hand flute direction make it compatible with standard right-hand tapping attachments and reversing tap heads.

Key Features

• Modified bottoming chamfer for threading close to the bottom of blind holes
• 40-degree helix angle with fast-flute style for efficient chip evacuation in blind hole applications
• Cobalt high-speed steel construction for improved wear resistance in steel and cast iron
• 9/16-18 UNF thread form with 2B class of fit for standard inch fastener applications
• Right-hand flute and right-hand thread direction for use with conventional tapping equipment
• Bright/uncoated finish suitable for use with cutting oils and standard tapping fluids

Compatibility

Designed for blind hole threading in aluminum and other non-ferrous metals, gray cast iron, malleable and spheroidal iron, and steel. Part of the GUHRING Series 3905 spiral flute tap line.

Installation Notes

Installation and use should be performed by a qualified machinist following applicable shop safety procedures. Secure the workpiece fully before tapping and ensure the spindle or tapping head is properly aligned to the pilot hole to prevent tap breakage. Apply a suitable cutting fluid or tapping compound for the material being threaded. Do not exceed the recommended RPM for the tap diameter and material — consult GUHRING cutting data tables for feed and speed guidance.