Guhring 9039650158750 Spiral Flute Tap 5/8-18 Unf Cobalt

Product Description

The GUHRING 9039650158750 is a spiral flute tap designed for cutting 5/8-18 UNF internal threads in ferrous and difficult-to-machine materials. Built from cobalt high-speed steel and finished with a MolyGlide coating, this tap handles the heat and friction demands of production threading and repair work. The modified bottoming chamfer allows threading closer to the bottom of a blind hole than a standard plug tap. With a 40-degree right-hand helix and a fast flute style, chips are efficiently evacuated up and out of the hole during tapping operations. Machinists, tool-and-die makers, and maintenance technicians working on precision fastener applications will find this tap suited to both manual and machine tapping setups.

This tap is intended for 5/8-18 UNF thread applications requiring a 2B class of fit, which is the standard tolerance for general-purpose inch fastener assemblies. It is appropriate for use in steel, alloy steel, stainless steel, and other materials where cobalt tooling is specified over standard M2 HSS. The modified bottoming chamfer makes it a practical choice when thread depth in a blind hole is critical and a bottoming tap is needed without the fragility of a full bottoming grind. Suitable for job shop, maintenance, and production environments where fine-pitch UNF threading in harder materials is routine.

Key Features

• 5/8-18 UNF thread form with 2B class of fit for general-purpose fine-pitch fastener assemblies
• Cobalt high-speed steel construction for improved heat resistance and longer tool life in hard or abrasive materials
• MolyGlide coating reduces friction and galling, improving chip flow and tap life
• Modified bottoming chamfer allows threading close to the bottom of blind holes
• 40-degree right-hand helix with fast flute style for efficient chip evacuation in through and blind hole applications
• H4/H5 thread limit for controlled tolerance on the finished thread

Compatibility

Designed as an OEM-style threading tool for 5/8-18 UNF tapped holes requiring a 2B fit; compatible with standard 5/8 tap holders and collet chucks sized for the shank of a Series 3965 tap.

Installation Notes

Threading operations should be performed by a qualified machinist or maintenance technician familiar with tap geometry and cutting speeds for cobalt tooling. Ensure the workpiece is securely fixtured and the tap is properly aligned to the pre-drilled hole before engaging. Use a cutting fluid or tapping compound appropriate for the workpiece material to complement the MolyGlide coating and extend tool life. Inspect the pre-drilled hole diameter against the recommended tap drill size for 5/8-18 UNF before tapping to avoid overloading the tap.