Guhring 9041180079380 Straight Flute Tap 5/16-18 Unc

Product Description

The GUHRING 9041180079380 is a solid carbide straight flute tap designed for blind hole threading in ferrous materials. Built to 5/16-18 UNC specifications with a 2B class of fit, it delivers precise, repeatable threads in demanding production environments. The modified bottoming chamfer allows the tap to cut threads closer to the bottom of a blind hole than a standard bottoming chamfer, reducing unusable thread length. With four flutes and coolant-through capability, this tap is suited for CNC machining centers and other high-output applications where chip control and tool life are critical. Licensed machinists and tool-and-die professionals are the primary users.

This tap is engineered for blind hole threading in gray cast iron, malleable iron, and spheroidal iron. The straight flute geometry works effectively in these brittle materials where chip breaking is not a concern. The H4/H5 thread limit accommodates the dimensional requirements of 2B-class threaded fits. At 3.543 inches overall length, it fits standard tap chucks and rigid tapping holders used in vertical and horizontal machining centers. The solid carbide construction offers higher rigidity and wear resistance compared to high-speed steel, making it appropriate for harder or abrasive ferrous workpieces.

Key Features

• 5/16-18 UNC thread form with 2B class of fit for standard fastener compatibility
• Modified bottoming chamfer for threading close to the bottom of blind holes
• Solid carbide construction for enhanced rigidity and wear resistance in ferrous materials
• Coolant-through design supports internal coolant delivery for chip evacuation and tool cooling
• H4/H5 thread limit for accurate dimensional control on 2B-class threads
• Four-flute straight geometry optimized for brittle materials such as cast iron

Compatibility

Designed for blind hole threading in gray cast iron, malleable iron, and spheroidal iron workpieces requiring 5/16-18 UNC threads with a 2B class of fit.

Installation Notes

Installation and use of this tap should be performed by a qualified machinist familiar with rigid tapping protocols. Before mounting, ensure the spindle is powered down and the tapping holder is confirmed to the correct shank diameter of 0.318 inches. Use the recommended cutting fluid or internal coolant supply rated for ferrous materials. Do not force the tap past its designed thread depth, as solid carbide is brittle and susceptible to breakage under lateral or bending loads.