Guhring 9039840048260 Spiral Flute Tap 10-24 Unc Cobalt Tin

Product Description

The GUHRING 9039840048260 is a spiral flute tap designed for blind hole threading in metalworking applications. It cuts a 10-24 UNC right-hand thread using a modified bottoming chamfer, making it suited for threading holes close to the bottom without leaving significant unthreaded depth. The tap is manufactured from cobalt high-speed steel with a TiN (titanium nitride) coating to improve wear resistance and reduce friction during cutting. With a 40-degree helix angle and fast flute style, it efficiently evacuates chips upward out of the hole, which is the defining advantage of spiral flute taps in blind hole work. This tool is installed and used by machinists, tool-and-die technicians, and maintenance professionals working in production or repair environments.

This tap is intended for threading blind holes in alloyed and unalloyed steel. The modified bottoming chamfer allows threading closer to the bottom of a hole than a standard plug tap while still providing some lead-in for alignment. The H11 thread limit designates an oversize tolerance class, commonly selected when a TiN-coated tap is used to account for the dimensional buildup of the coating and ensure proper thread fit after plating or finishing operations on the workpiece. The Series 3984 designation identifies this as part of a specific GUHRING product family of spiral flute taps.

Key Features

• Modified bottoming chamfer for threading close to the bottom of blind holes
• 40-degree helix angle with fast flute geometry for efficient upward chip evacuation
• Cobalt HSS construction for improved heat and wear resistance in steel applications
• TiN coating reduces friction and extends tool life in production threading
• H11 oversize thread limit suited for use after workpiece coating or plating operations
• Right-hand flute and right-hand thread in a 3-flute configuration

Compatibility

Designed for blind hole threading in alloyed and unalloyed steel workpieces where a 10-24 UNC thread form is required. Coolant-through is not supported by this tap.

Installation Notes

This tap is used in a tapping machine, CNC machining center, or hand tapping setup by a qualified machinist or maintenance technician. Always ensure the tap is properly aligned with the drilled hole before applying torque to avoid tap breakage. Use an appropriate cutting fluid or tapping compound for steel to reduce heat and extend tool life. Do not reverse the tap too aggressively, as cobalt taps can be brittle under shock loading.