Guhring 9039110111130 Spiral Flute Tap 7/16-20 Unf

Product Description

The GUHRING 9039110111130 is a spiral flute tap designed for cutting 7/16-20 UNF internal threads in blind hole applications. Built from powdered metal with a TiN (titanium nitride) coating, this tap delivers extended tool life and reduced friction in demanding cutting environments. It runs a 40-degree helix angle with a fast flute style that efficiently evacuates chips upward out of the hole — a critical performance factor when threading blind holes. Modified bottoming chamfer geometry allows threading closer to the bottom of a blind hole compared to standard plug or taper chamfer taps. The 3-flute configuration balances chip clearance with thread form support across a range of workpiece materials.

This tap is rated for use in aerospace alloys and stainless steel — materials that work-harden quickly and demand sharp, consistent cutting edges throughout the tool life. The H4/H5 thread limit and 2B class of fit make it suitable for standard commercial and precision aerospace threading tolerances. Right-hand flute and right-hand thread direction, 3.157 inches overall length, 0.323-inch shank diameter, and 0.242-inch square size fit standard tap holders and chucks used in machining centers and manual tapping setups alike.

Key Features

• 7/16-20 UNF thread form, right-hand thread and right-hand flute direction
• Modified bottoming chamfer for threading close to blind hole bottom
• 40-degree helix angle with fast flute style for efficient upward chip evacuation
• Powdered metal substrate with TiN coating for wear resistance in hard materials
• Rated for aerospace alloys and stainless steel applications
• H4/H5 thread limit, 2B class of fit for standard precision tolerances

Compatibility

Designed for blind hole threading in aerospace alloys and stainless steel. Fits standard tap holders and chucks accommodating a 0.323-inch shank diameter. Part of GUHRING Series 3911.

Installation Notes

Installation is performed by machinists and tooling technicians using CNC machining centers or manual tapping equipment. Ensure the workpiece is securely fixtured and the tap is properly aligned to the pre-drilled pilot hole before engaging the cut. Use a cutting fluid or coolant appropriate for the workpiece material — this tap does not have through-coolant capability. Follow shop-specific speeds and feeds for the workpiece material; stainless steel and aerospace alloys require conservative parameters to prevent work hardening and tool breakage.