Guhring 9044095079380 Spiral Flute Tap 5/16-24 Unf Cobalt

Product Description

The GUHRING 9044095079380 is a spiral flute tap designed for blind hole threading in a wide range of ferrous and non-ferrous materials. Part of the Series 4409 line, it cuts a 5/16-24 UNF right-hand thread to a 2B/3B class of fit. The tap is manufactured from cobalt high-speed steel with an oxide finish, providing wear resistance in demanding tapping applications. It features a 40-degree helix angle with a fast flute style, which efficiently evacuates chips upward and out of the hole — a critical advantage in blind hole work. Overall length is 2.72 inches with a thread length of 0.433 inches and a tapping depth of 1.377 inches.

This tap is suited for production and maintenance threading operations on a variety of materials including alloy steel, stainless steel, cast iron, ductile iron, aluminum alloy, heat treated steel, case hardened steel, tool steel, and free cutting steel. The modified bottoming chamfer allows threading closer to the bottom of a blind hole than a standard taper or plug chamfer, making it a common choice for tight-tolerance blind hole work in machining, fabrication, and mechanical assembly environments. It is typically used in CNC machining centers, manual knee mills, and drill presses with tapping attachments.

Key Features

• Cobalt HSS construction resists heat and wear in hard-to-machine alloys and stainless steel
• 40-degree helix angle with fast flute style for reliable upward chip evacuation in blind holes
• Modified bottoming chamfer allows threading close to the bottom of a blind hole
• Oxide finish reduces friction and provides light corrosion resistance during storage and use
• H5 thread limit for consistent fit within 2B and 3B class of fit tolerances
• Right-hand thread and right-hand flute direction; no coolant-through feature

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. Cuts 5/16-24 UNF threads to 2B and 3B class of fit.

Installation Notes

Installation and use of this tap should be performed by a qualified machinist or tooling professional familiar with threading operations. Always secure the workpiece and ensure the tapping spindle or attachment is properly aligned before engagement to avoid tap breakage. Use an appropriate cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread quality. Follow all applicable shop safety practices and machine manufacturer guidelines when setting feeds and speeds.