Guhring 9039190111130 Spiral Flute Tap 7/16-14 Unc

Product Description

The GUHRING 9039190111130 is a spiral flute tap designed for blind hole threading in alloyed and unalloyed steel. It cuts a 7/16-14 UNC right-hand thread to a 2B class of fit and carries an H5/H6 thread limit for consistent dimensional accuracy. The tap is ground from cobalt high-speed steel and left bright/uncoated, making it well-suited for applications where coating buildup in tight thread profiles is a concern. With a 40-degree helix angle and a fast flute style, it efficiently evacuates chips up and out of the hole during the threading cycle. Machinists and tool-and-die technicians install this tap in CNC machining centers, drill presses, and manual tapping setups.

This tap is intended for blind hole threading operations in alloyed steel and unalloyed steel workpieces. The modified bottoming chamfer allows the tap to thread close to the bottom of a blind hole while still providing enough lead to start reliably. A 3-flute, right-hand spiral flute geometry drives chips upward out of the hole, reducing chip packing in interrupted cuts and deep blind holes. It is part of the GUHRING Series 3919 and is packaged individually for single-tap replacement or tooling additions.

Key Features

• Modified bottoming chamfer for threading close to the bottom of blind holes
• 40-degree helix angle with fast flute style for efficient upward chip evacuation
• Cobalt high-speed steel construction for strength in alloyed and unalloyed steel
• H5/H6 thread limit for tight dimensional control on 2B class of fit threads
• Bright/uncoated finish eliminates coating-related dimensional buildup concerns
• Right-hand flute and right-hand thread; no coolant-through requirement

Compatibility

Designed for blind hole threading in alloyed steel and unalloyed steel. Cuts 7/16-14 UNC threads to a 2B class of fit with H5/H6 thread limits. Part of GUHRING Series 3919.

Installation Notes

This tap is installed and operated by machinists, toolroom technicians, or maintenance mechanics familiar with thread-cutting operations. Before use, confirm that the pilot hole is drilled to the correct tap drill diameter for a 7/16-14 UNC thread and that the workpiece is securely fixtured. Use an appropriate tapping fluid or cutting oil matched to the workpiece material to reduce heat and extend tap life. Never reverse the tap under power without confirming the machine or tapping head supports synchronized reversing, as doing so without proper control can break the tap in the hole.