Guhring 9039700041660 Spiral Flute Tap 8-32 Unc Cobalt

Product Description

The GUHRING 9039700041660 is a spiral flute tap designed for blind hole threading in a variety of machined components. Built from cobalt high-speed steel and finished with a MolyGlide coating, this tap handles the demands of threading aluminum and aluminum alloys with consistent thread quality. It produces a 8-32 UNC right-hand thread to a 2B class of fit, with a modified bottoming chamfer that allows threading close to the bottom of a blind hole. With a 45-degree helix angle and fast flute style, chips are efficiently evacuated upward out of the hole during cutting. Overall length is 2.205 inches.

This tap is intended for use in machine tapping operations on aluminum and aluminum alloy workpieces, particularly where blind holes require threading near the bottom. The modified bottoming chamfer and fast 45-degree spiral flute geometry make it well-suited for CNC machining centers, drill presses, and tapping attachments in production or job shop environments. It is typically installed and operated by machinists, tool-and-die makers, and precision manufacturing technicians. The H3 and H4 thread limits accommodate standard tolerance requirements for 2B fit fastener applications.

Key Features

• Cobalt construction provides increased hardness and heat resistance compared to standard HSS taps
• MolyGlide finish reduces friction and built-up edge when tapping aluminum alloys
• 45-degree fast helix angle promotes efficient upward chip evacuation in blind holes
• Modified bottoming chamfer allows threading to within a few threads of the hole bottom
• H3 and H4 thread limits support 2B class of fit tolerancing
• Right-hand flute and right-hand thread configuration for standard machine tapping

Compatibility

Designed for blind hole threading of aluminum and aluminum alloy workpieces requiring an 8-32 UNC right-hand thread to a 2B class of fit. Suitable for use with standard machine tapping holders and tapping attachments that accept the corresponding shank diameter.

Installation Notes

This tap should be installed by a qualified machinist using a properly sized tap holder or tapping chuck. Ensure the workpiece is securely fixtured and the spindle is aligned with the pre-drilled pilot hole before engaging the tap. Use appropriate cutting fluid or lubricant for aluminum even though the MolyGlide finish provides some dry-run capability. Inspect the tap for wear or chipping before each use to avoid thread damage or breakage in the workpiece.