Guhring 9039090040000 Spiral Flute Tap M4 X 0.70

Product Description

The GUHRING 9039090040000 is a spiral flute tap designed for blind hole threading in metric coarse applications. Built from powdered metal with a titanium nitride (TiN) coating, it delivers extended tool life in demanding materials including aerospace alloys and stainless steel. The 3-flute, right-hand spiral design with a 40-degree helix angle evacuates chips efficiently out of the hole, reducing the risk of tap breakage in tough workpieces. The modified bottoming chamfer allows threading close to the bottom of blind holes. Sizing is M4 x 0.70 with a 6H class of fit, suited for precision thread requirements in production and maintenance environments.

This tap is used in blind hole threading operations on aerospace alloys and stainless steel components. The modified bottoming chamfer makes it a go-to choice when thread depth must reach near the bottom of a drilled hole. The 6H tolerance class meets standard metric thread fits used across industrial, aerospace, and general machining applications. It is typically run on CNC machining centers, manual mills, or tapping machines by machinists and tool-and-die professionals. The TiN finish reduces friction and improves wear resistance in ferrous and high-strength alloy materials.

Key Features

• M4 x 0.70 metric coarse thread, 6H class of fit for precision fitment
• Powdered metal construction with TiN coating for extended tool life in hard materials
• 40-degree right-hand spiral flute for efficient chip evacuation in blind holes
• Modified bottoming chamfer for threading close to the bottom of a blind hole
• Rated for aerospace alloys and stainless steel applications
• Series 3909 fast-flute style, no coolant-through requirement

Compatibility

Designed for blind hole threading in aerospace alloys and stainless steel; compatible with standard M4 x 0.70 metric coarse thread applications requiring a 6H class of fit.

Installation Notes

This tap should be installed and run by a qualified machinist following standard tapping procedures. Power down or lock out all spindle motion before changing tooling. Use appropriate tapping fluid or cutting oil for stainless steel and aerospace alloys to prevent galling and premature wear. Do not exceed the recommended speed range for the workpiece material and always ensure the tap is properly aligned with the drilled pilot hole to avoid breakage.