Guhring 9048855222250 Spiral Point Tap 7/8-9 Unc Plug

Product Description

The GUHRING 9048855222250 is a spiral point plug tap designed for right-hand through-hole threading in steel applications. Built from HSS-E cobalt high speed steel and finished with GUHRING's Ignator coating, it delivers extended tool life in demanding production environments. The 4-flute spiral point geometry pushes chips forward ahead of the cutting edge, keeping the hole clear and reducing the risk of chip packing during blind or through-hole tapping. This tap covers a 7/8-9 UNC thread form to a 2B/3B class of fit and carries an H6/H7 thread limit, making it suitable for both standard and close-tolerance fastener applications. Machinists and CNC operators in job shops, manufacturing, and maintenance facilities are the primary users.

This tap is suited for through-hole threading operations in steel workpieces on CNC machining centers, drill presses, and tapping machines. The Ignator coating reduces friction and improves heat resistance, supporting higher feed rates in ferrous materials. With a 7/8-9 UNC thread size and plug chamfer style, it is well matched to production runs where a starting chamfer aids alignment and threading consistency. The tap does not support coolant-through delivery and is not designed for interrupted thread or oversize applications.

Key Features

• 7/8-9 UNC thread form with plug chamfer for guided thread starting
• HSS-E cobalt construction for improved heat and wear resistance over standard HSS
• Ignator coating reduces friction and extends tool life in steel
• 4-flute spiral point geometry pushes chips forward for clean through-hole threading
• 2B/3B class of fit with H6/H7 thread limit for versatile tolerance coverage
• Right-hand cut, no coolant-through, non-interrupted thread design

Compatibility

Designed as an OEM-style production tap for through-hole threading of 7/8-9 UNC threads in steel, compatible with standard tap holders and floating tap chucks sized for a 0.697-inch shank diameter.

Installation Notes

A licensed machinist or qualified toolroom operator should install and run this tap. Secure the workpiece and verify correct tap holder alignment before starting the cycle to avoid cross-threading or tap breakage. Power down or lock out the machine before changing taps or inspecting the thread. Use a cutting fluid or tapping compound rated for ferrous materials to supplement lubrication, as this tool does not include coolant-through capability.