Guhring 9039950079380 Spiral Flute Tap 5/16-24 Unf

Product Description

The GUHRING 9039950079380 is a spiral flute tap designed for blind hole threading in demanding metal applications. Built from powdered metal with a TiN (titanium nitride) coating, it delivers extended wear resistance in hard and high-tensile materials. The tap is configured with a modified bottoming chamfer, allowing threading close to the bottom of blind holes. Available with 3 or 5 flutes in a fast flute style with a 40-degree helix angle, it efficiently evacuates chips upward during the cut. The 2B class of fit meets standard unified thread tolerances, and the H3/H4 thread limit provides consistent sizing across production runs. Overall length is 3.543 inches.

This tap is intended for threading blind holes in heat treatable hardened steel, high tensile steel, and tool steel. The high helix angle and spiral flute geometry make it well suited for through-spindle coolant setups, though coolant-through is not built into this model. It is commonly used in precision machining, toolroom, and production environments where tight thread tolerances and difficult materials are the norm. Licensed machinists and tooling specialists are the primary installers and operators of this product.

Key Features

• Modified bottoming chamfer for threading close to the base of blind holes
• TiN coating extends tool life in hardened and high-tensile steels
• 40-degree helix angle promotes efficient chip evacuation in blind hole applications
• H3/H4 thread limit supports consistent 2B class of fit tolerances
• Powdered metal construction provides high hardness and wear resistance
• Fast flute style reduces cutting torque in difficult materials

Compatibility

Designed for blind hole threading in heat treatable hardened steel, high tensile steel, and tool steel. Thread form is 5/16-24 UNF, right hand thread, 2B class of fit. Series 3995.

Installation Notes

This tap is installed and operated by qualified machinists on CNC or manual tapping equipment. Ensure the workpiece is securely fixtured and the spindle is aligned to the hole axis before engaging the tap. Follow machine-specific speed and feed recommendations for the work material and tap size. Inspect the tap for wear or chipping before each use and replace at first sign of deterioration to avoid thread damage or breakage in the workpiece.