Guhring 9039850158750 Spiral Flute Tap 5/8-18 Unc

Product Description

The GUHRING 9039850158750 is a spiral flute tap designed for blind hole threading in alloyed and unalloyed steel. Built from cobalt high-speed steel with a TiN (titanium nitride) coating, it delivers extended tool life in demanding production environments. The modified bottoming chamfer allows threading closer to the bottom of a blind hole, while the 40-degree helix angle and fast flute style efficiently evacuate chips upward out of the cut. At 3.811 inches overall length, this tap fits standard tap holders and CNC tooling setups used by machinists and tool-and-die professionals.

This tap is suited for threading 5/8-18 UNC blind holes in alloyed and unalloyed steel workpieces, both in manual tapping operations and CNC machining centers. The H11 thread limit indicates a slightly oversize tolerance class, producing threads that accommodate standard fastener fit in steel applications. The right-hand flute and right-hand thread orientation make it compatible with conventional tapping cycles. It is a Series 3985 tap, used in production shops, maintenance facilities, and precision machine work where consistent thread quality in steel is required.

Key Features

• Modified bottoming chamfer for threading close to the bottom of blind holes
• Cobalt HSS construction for improved heat and wear resistance in steel
• TiN coating reduces friction and extends tool life
• 40-degree helix angle with fast flute style for efficient chip evacuation
• H11 thread limit with 0.005 inch oversize for consistent fit in steel threading applications
• Right-hand flute and right-hand thread for standard tapping cycles

Compatibility

Designed for blind hole threading of 5/8-18 UNC threads in alloyed and unalloyed steel. Fits standard tap holders and CNC tapping chucks sized for the 0.480 inch shank diameter.

Installation Notes

This tap is installed and operated by machinists using standard tap holders, floating tap chucks, or rigid CNC tapping cycles. Ensure the spindle is stopped and the machine is in a safe state before changing tooling. Use appropriate cutting fluid rated for steel to reduce heat buildup and extend tap life. Do not reverse-cycle without confirming the holder supports it, as modified bottoming taps are particularly sensitive to misalignment in blind hole applications.