Guhring 9039920028450 Spiral Point Tap 4-40 Unc Tin

Product Description

The GUHRING 9039920028450 is a spiral point tap designed for through-hole threading in metal workpieces. It cuts a 4-40 UNC thread profile with a right-hand direction and a plug chamfer for ease of entry. The tap is manufactured from powdered metal and coated with titanium nitride (TiN) for improved wear resistance and tool life. At 2.205 inches overall length with a 5/16-inch thread length, it fits standard tapping chucks and hand tap wrenches. The 3-flute spiral point geometry pushes chips forward ahead of the tap, making it well suited to through-hole applications where chip evacuation is critical.

This tap is intended for through-hole threading operations in heat-treatable hardened steel, high-tensile steel, and tool steel. It carries a 2B class of fit and an H2/H3 thread limit, providing the tolerance range most commonly specified for general-purpose UNC fastener threads. Typical use cases include production tapping on CNC machining centers, drill press setups, and manual tapping operations in maintenance and fabrication environments. It is used by machinists, toolmakers, and maintenance technicians working in industrial and manufacturing settings.

Key Features

• 4-40 UNC thread profile with right-hand cutting direction
• Powdered metal construction for improved toughness and wear resistance
• TiN coating extends tool life in ferrous materials
• 3-flute spiral point geometry promotes forward chip ejection in through-hole applications
• H2/H3 thread limit suits 2B class-of-fit tolerance requirements
• Plug chamfer allows straightforward thread starting

Compatibility

Designed for through-hole threading in heat-treatable hardened steel, high-tensile steel, and tool steel. Thread limit H2/H3 and 2B class of fit are standard for general-purpose UNC fastener thread applications. Part of GUHRING Series 3992.

Installation Notes

This tap should be installed and operated by qualified machinists or toolmakers familiar with tapping operations and cutting tool safety. Ensure the workpiece and any machine spindle are properly secured before beginning the tapping operation. Use an appropriate cutting fluid or tapping compound rated for ferrous materials to reduce heat buildup and extend tool life. Never reverse the tap under power without confirming the machine is set for reverse-tapping cycles, and inspect the tap for wear or chipping before each use.