Guhring 9039930158750 Spiral Flute Tap 5/8-11 Unc

Product Description

The GUHRING 9039930158750 is a spiral flute tap designed for blind hole threading in demanding ferrous materials. It cuts a 5/8-11 UNC right-hand thread to a 2B class of fit using a modified bottoming chamfer, making it suitable for threading close to the bottom of a blind bore. The tap is manufactured from powdered metal and coated with TiN (titanium nitride) for improved wear resistance and heat tolerance. With a 40-degree helix angle and fast flute style, it efficiently evacuates chips up and out of the hole during the threading cycle. Overall length is 4.331 inches. Licensed machinists and tool-and-die technicians are the primary installers.

This tap is rated for use in heat-treatable hardened steel, high tensile steel, and tool steel — material groups that demand both a robust substrate and a hard coating to maintain thread accuracy across production runs. The modified bottoming chamfer allows threading closer to blind hole floors than a standard plug chamfer tap while still providing adequate lead-in for alignment. The 4-flute, right-hand spiral flute geometry is well suited to machine tapping operations in CNC machining centers and rigid tapping setups where controlled chip flow is critical.

Key Features

• 5/8-11 UNC thread form, right-hand thread and right-hand flute direction
• Modified bottoming chamfer for threading near the base of blind holes
• Powdered metal construction with TiN coating for extended tool life in hard steels
• 40-degree helix angle with fast flute style for efficient upward chip evacuation
• Thread limit H5 and H6 for close-tolerance 2B class of fit compliance
• No coolant-through configuration — suited for flood or external coolant delivery

Compatibility

Rated for blind hole threading in heat-treatable hardened steel, high tensile steel, and tool steel per manufacturer material application data. Thread limit H5 and H6 supports 2B class of fit tolerance requirements. This tap belongs to GUHRING Series 3993.

Installation Notes

This tap is intended for machine tapping by qualified machinists using a rigid tapping cycle or tapping attachment. Power down and lock out the machine spindle before loading or changing the tap. Use the correct tap holder and ensure the tap is concentric with the pre-drilled pilot hole to avoid tap breakage. Follow the applicable speeds and feeds for the specific workpiece material and adhere to any shop safety standards for cutting fluids when working with hard steels.