Guhring 9039770142880 Spiral Flute Tap 9/16-12 Unc

Product Description

The GUHRING 9039770142880 is a spiral flute tap designed for blind hole threading in alloyed and unalloyed steel. Part of the Series 3977 line, it cuts a 9/16-12 UNC right-hand thread to a 2B class of fit. The tap is manufactured from cobalt high-speed steel and coated with TiN (titanium nitride) for improved wear resistance and longer tool life. With a 40-degree helix angle and a fast flute style, it efficiently evacuates chips up and out of blind holes. Overall length is 3.591 inches. Machinists and tool-and-die tradespeople use this tap in CNC and manual tapping applications on ferrous workpieces.

This bottoming tap is suited for threading to the full depth of blind holes where a plug or taper tap cannot reach the required thread length. The bottoming chamfer leaves only 1 to 2 thread leads uncut at the bottom, making it a finishing tap typically used after a plug tap has started the thread. It is appropriate for production and maintenance machining environments handling medium-carbon, alloy, and structural steels. Coolant-through capability is not featured on this tool, so standard flood or mist coolant delivery at the spindle is recommended.

Key Features

• Cobalt high-speed steel construction for heat and wear resistance in ferrous materials
• TiN coating reduces friction and extends tool life in repetitive threading operations
• 40-degree helix angle with fast flute style promotes efficient chip evacuation in blind holes
• Bottoming chamfer allows threading to the full depth of blind hole applications
• Right-hand flute and right-hand thread direction for standard machine tapping setups
• H5/H6 thread limit provides controlled oversize tolerance for 2B class of fit

Compatibility

Designed for blind hole threading in alloyed and unalloyed steel workpieces; compatible with standard tapping chucks and holders sized for a 0.429-inch shank diameter. Thread form is 9/16-12 UNC to 2B class of fit.

Installation Notes

This tap should be installed by a qualified machinist following established tapping procedures. Ensure the spindle and workpiece are secure and the machine is de-energized before changing tooling. Use a tapping lubricant or cutting fluid appropriate for steel to protect the cutting edges and maintain thread quality. Verify shank seating and chuck torque per the machine manufacturer specifications before initiating the tapping cycle.