Guhring 9039380127000 Machine Tap 1/2-20 Unf Cobalt

Product Description

The GUHRING 9039380127000 is a 1/2-20 UNF cobalt steel machine tap with a FIREX coating, designed for right-hand threading in both blind and through-hole applications. It features a modified bottoming chamfer for close-to-bottom thread production, four straight flutes for efficient chip evacuation, and a Class 2B thread fit with H4/H5 thread limits. Overall length is 3-3/8 inches (3.381 inches decimal). This tap is built for shops and machinists working with abrasive materials and cast iron, where tool wear is a primary concern and coating durability matters.

This tap is suited for production and job-shop environments where 1/2-20 UNF internal threads are required in abrasive or ferrous workpieces. The modified bottoming chamfer makes it appropriate for blind hole work where full thread depth close to the bottom is required, while remaining capable in through-hole applications. The FIREX coating extends tool life in cast iron and similarly abrasive materials. The 0.367-inch shank diameter and 0.275-inch square size are compatible with standard tap holders and machines configured for this size range.

Key Features

• 1/2-20 UNF right-hand thread, Class 2B fit with H4/H5 thread limits
• Modified bottoming chamfer for threading close to the bottom of blind holes
• 4-flute straight flute geometry for chip management in ferrous and abrasive materials
• Cobalt construction with FIREX coating for extended tool life and heat resistance
• Capable in both blind hole and through-hole threading operations
• No coolant-through design; suitable for standard coolant delivery setups

Compatibility

Designed for use in abrasive materials and cast iron as stated by the manufacturer. Suitable for blind hole and through-hole threading operations requiring a 1/2-20 UNF thread form.

Installation Notes

This tap is installed by machinists using a compatible tap holder, machine tap chuck, or CNC tapping head rated for the 0.367-inch shank diameter. Ensure the workpiece is properly fixtured and that cutting speed is appropriate for the workpiece material before beginning the tapping cycle. When tapping blind holes, confirm hole depth is sufficient to accommodate the modified bottoming chamfer before the full thread length. Always follow shop safety practices and equipment manufacturer guidelines when operating tapping machinery.