Guhring 9039310127000 Spiral Flute Tap 1/2-13 Unc Cobalt

Product Description

The GUHRING 9039310127000 is a spiral flute tap designed for blind hole threading in aluminum and aluminum alloy materials. It cuts a 1/2-13 UNC right-hand thread to a 2B class of fit and is manufactured from cobalt steel with a bright, uncoated finish. The 45-degree helix angle and fast flute style help evacuate chips efficiently in soft, gummy materials where conventional taps tend to pack and break. With an overall length of 3.375 inches and a shank diameter of 0.367 inches, it fits standard tap holders used in CNC machining centers, drill presses, and manual tapping arms. Licensed machinists, toolroom technicians, and production floor operators are the typical users of this tool.

This tap is intended for blind hole applications in aluminum and aluminum alloy workpieces. The modified bottoming chamfer allows threading closer to the bottom of a blind hole than a standard plug chamfer, making it well-suited for shallow-depth thread requirements in fixture plates, enclosures, and structural aluminum components. It carries an H5/H6 thread limit, accommodating standard tolerance requirements for 2B-fit threaded assemblies. The two-flute design keeps the tap cross-section strong relative to the tap diameter while still providing adequate chip clearance in non-ferrous materials.

Key Features

• Cobalt steel construction provides toughness and heat resistance over high-speed steel in demanding production runs
• 45-degree helix angle promotes upward chip evacuation in blind holes, reducing chip packing
• Modified bottoming chamfer allows threading close to the bottom of a blind hole
• H5/H6 thread limit meets 2B class of fit tolerances for UNC threads
• Bright, uncoated finish suitable for use with cutting oils and water-soluble coolants on aluminum
• Right-hand flute and right-hand thread for standard spindle rotation

Compatibility

Designed for blind hole threading in aluminum and aluminum alloy materials. Rated for 2B class of fit on 1/2-13 UNC threads. Fits standard tap holders sized for a 0.367-inch shank diameter with a 0.275-inch square drive. Part of the GUHRING Series 3931.

Installation Notes

This tap is installed and operated by machinists and toolroom technicians. Always secure the workpiece and verify spindle alignment before tapping. Apply an appropriate cutting fluid rated for aluminum to reduce friction and extend tap life. Follow the tap holder manufacturer torque and floating-driver recommendations to prevent tap breakage in blind holes.