Guhring 9039820158750 Spiral Point Tap 5/8-11 Unc

Product Description

The GUHRING 9039820158750 is a spiral point plug tap designed for right-hand through-hole threading in a wide range of ferrous and non-ferrous materials. Built from cobalt high-speed steel with a titanium nitride (TiN) coating, it delivers added heat resistance and wear life compared to standard HSS taps. The 5/8-11 UNC thread form, H7 thread limit, and 4-flute geometry make it a reliable choice for production threading where chip ejection and hole quality matter. Overall length is 2.811 inches, with a shank diameter of 0.480 inches. Licensed machinists, tool-and-die makers, and maintenance mechanics specify this tap for demanding threading applications.

This tap is suited for through-hole threading operations in aluminum, gray cast iron, malleable iron, spheroidal iron, non-ferrous metals, stainless steel, and steel. The plug chamfer provides a gradual lead-in, making it appropriate for through-holes where the tap can pass completely through the workpiece. It carries an oversize designation of 0.003 inches, which is standard for taps used with TiN-coated or plated threads where final hole tolerance must be maintained after coating.

Key Features

• 5/8-11 UNC thread form with H7 thread limit for consistent fit tolerance
• Cobalt HSS construction for improved heat resistance in hard and stainless materials
• TiN coating extends tool life and reduces friction during cutting
• 4-flute spiral point geometry pushes chips forward ahead of the tap in through-hole applications
• Plug chamfer provides gradual thread engagement suitable for through-holes
• Oversize by 0.003 inches to compensate for springback in coated or tight-tolerance applications

Compatibility

Designed as an OEM-style replacement or direct-use spiral point tap for machine tapping operations requiring a 5/8-11 UNC plug tap in the GUHRING Series 3982 product line.

Installation Notes

This tap is intended for use by machinists and trained metalworking professionals in drill press, CNC, or tapping machine setups. Ensure the workpiece is securely clamped and the pilot hole diameter is correct for the 5/8-11 UNC thread specification before beginning. Use appropriate tapping fluid or cutting oil for the workpiece material to prevent galling, especially when threading stainless steel. Do not use this tap in blind holes, as the spiral point geometry is designed exclusively for through-hole threading.