Guhring 9039810158750 Spiral Flute Tap 5/8-18 Unc Cobalt

Product Description

The GUHRING 9039810158750 is a spiral flute tap designed for blind hole threading in alloyed and unalloyed steel. It cuts a 5/8-18 UNC right-hand thread with a modified bottoming chamfer, allowing threads to be produced close to the bottom of a blind hole. The tap is manufactured from cobalt high-speed steel and finished with a TiN coating for improved wear resistance and tool life. With a 40-degree helix angle and fast flute style, it efficiently evacuates chips out of the hole during cutting. The H7 thread limit indicates a slight oversize of 0.003 inches, which compensates for springback in tougher materials. Overall length is 3.811 inches.

This tap is suited for machinists, toolroom professionals, and production shop technicians working with alloyed and unalloyed steel workpieces. The modified bottoming chamfer makes it the correct choice when full thread depth near the base of a blind hole is required. The 4-flute, right-hand spiral flute design provides balanced cutting action on both manual and CNC tapping operations. It is not designed for through-coolant delivery.

Key Features

• Modified bottoming chamfer for threading close to the bottom of blind holes
• Cobalt HSS construction for increased hardness and heat resistance in steel applications
• TiN coating extends tool life and reduces friction during cutting
• 40-degree helix angle with fast flute style for efficient chip evacuation
• H7 thread limit with 0.003 inches oversize to compensate for material springback
• Right-hand flute and right-hand thread for standard tapping direction

Compatibility

Designed for blind hole threading in alloyed and unalloyed steel. Cuts 5/8-18 UNC right-hand threads to H7 thread limit. Not rated for coolant-through applications.

Installation Notes

This tap is installed and operated by machinists using a tap wrench, tapping head, or CNC rigid tapping cycle. Always secure the workpiece and ensure the tap is aligned perpendicular to the hole before engagement. Use an appropriate cutting fluid for steel to reduce heat and extend tap life. Follow shop safety procedures and relevant machine tool standards when operating tapping equipment.