Guhring 9039380063500 1/4-28 Unf Cobalt Machine Tap

Product Description

The GUHRING 9039380063500 is a 1/4-28 UNF straight flute machine tap designed for production threading in blind holes and through-holes. Built from cobalt high-speed steel with a FIREX coating, it delivers extended tool life in demanding materials. The modified bottoming chamfer allows threading close to the bottom of blind holes. With 4 flutes and a right-hand thread direction, this tap is suited for use in CNC machining centers, drill presses, and manual tapping machines. Overall length is 2.5 inches, with a tapping depth of 1.181 inches. Class of fit is 2B, thread limit H3 and H4.

This tap is rated for use in abrasive materials and cast iron, making it appropriate for job shops, tool rooms, and production floors where harder workpiece materials are common. The straight flute geometry suits both blind and through-hole threading applications. It is sold individually and is a standard hand-tool or machine-tool item for machinists and toolroom technicians working to UNF thread specifications.

Key Features

• Modified bottoming chamfer for threading near the base of blind holes
• Cobalt HSS construction with FIREX coating for extended tool life in abrasive and cast iron materials
• 4-flute straight flute design compatible with blind hole and through-hole threading
• Right-hand thread, 1/4-28 UNF, Class 2B fit
• Thread limit H3 and H4 for dimensional accuracy
• No coolant-through requirement — suitable for standard tapping setups

Compatibility

Designed for use in materials including abrasive material and cast iron. Suitable for standard 1/4-28 UNF tapping applications in both blind hole and through-hole configurations on manual and CNC tapping equipment.

Installation Notes

This tap is installed by machinists and toolroom technicians using standard tapping chucks, drill presses, or CNC rigid tapping cycles. Ensure the spindle is fully stopped and the machine is in a safe state before changing or inspecting the tap. Use an appropriate cutting fluid or tapping compound for the workpiece material to reduce heat and extend tap life. Verify hole size and depth before tapping to confirm they meet the requirements for 1/4-28 UNF thread production.