Guhring 9048813079380 Spiral Flute Tap 5/16-18 Unc

Product Description

The GUHRING 9048813079380 is a spiral flute tap designed for blind hole threading in a wide range of ferrous and non-ferrous materials. Built from cobalt high-speed steel and finished with GUHRING Ignator coating, this tap handles demanding applications including stainless steel, heat-treated steel, alloy steel, and cast iron. The 40-degree helix angle evacuates chips upward out of the hole, making it well-suited for blind hole work where chip packing is a common failure point. It carries a 5/16-18 UNC thread form with a modified bottoming chamfer, allowing threads to be cut closer to the bottom of a blind bore than a standard plug or taper chamfer tap.

This tap is used in precision machining and metalworking environments where tight thread tolerances are required. With a 2B/3B class of fit and H3 thread limit, it produces threads suitable for general-purpose fastener engagement and precision assemblies. Typical install scenarios include CNC tapping operations, manual tapping on a drill press, and production threading of parts made from structural steel, tool steel, ductile iron, malleable cast iron, aluminum alloy, and free-cutting steel. It is intended for use by machinists, tool and die makers, and maintenance technicians working in industrial or machine shop settings.

Key Features

• 40-degree right-hand helix angle for upward chip evacuation in blind holes
• Cobalt HSS construction for thermal and wear resistance in tough materials
• Ignator finish reduces friction and extends tool life in abrasive alloys
• Modified bottoming chamfer allows threading close to the bottom of blind bores
• H3 thread limit and 2B/3B class of fit for consistent, general-purpose thread quality
• Right-hand flute and right-hand thread in Series 4881 fast flute style

Compatibility

Designed for blind hole threading in alloy steel, alloy tool steel, aluminum alloy, case-hardened steel, cast iron, ductile iron, free-cutting steel, heat-treated steel, malleable cast iron, stainless steel, structural steel, and tool steel. No coolant-through feature; suitable for use with external cutting fluid application.

Installation Notes

This tap should be installed in a tapping chuck or rigid holder appropriate for the machine spindle in use. Power down and secure the workpiece before changing or setting tooling. Use a cutting fluid compatible with the workpiece material to manage heat and prolong tap life. Follow applicable shop safety and machine guarding practices when operating tapping equipment.