Guhring 9039110028450 Spiral Flute Tap 4-48 Unf Tin

Product Description

The GUHRING 9039110028450 is a spiral flute tap designed for threading blind holes in demanding materials including aerospace alloys and stainless steel. It cuts a 4-48 UNF right-hand thread to a 2B class of fit using three right-hand spiral flutes with a 40-degree helix angle. The modified bottoming chamfer allows the tap to thread closer to the bottom of a blind hole than a standard bottoming tap. Manufactured from powdered metal and finished with a titanium nitride (TiN) coating, this tap delivers improved wear resistance and heat dissipation during high-cycle production and maintenance applications. It carries an H2/H3 thread limit, covering a range of tolerance requirements for precision threaded assemblies.

This tap is suited for use in aerospace, industrial, and precision manufacturing environments where tight tolerances are required in blind-hole configurations. The fast flute style promotes efficient chip evacuation, which is critical when threading stainless steel or aerospace alloys that produce stringy or compacted chips. At 1.882 inches overall length with a 0.141 inch shank diameter, it fits standard tap holders and chucks used in CNC machining centers and manual tapping heads. It is part of the GUHRING Series 3911 product line.

Key Features

• Modified bottoming chamfer for threading close to the bottom of blind holes
• 40-degree helix angle with fast flute style for active chip evacuation in tough materials
• TiN coating improves surface hardness and reduces friction during cutting
• Powdered metal construction provides consistent grain structure and extended tool life
• H2/H3 thread limit supports a range of 2B fit tolerance requirements
• Right-hand flute and right-hand thread geometry for standard tapping setups

Compatibility

Designed for blind hole threading in aerospace alloys and stainless steel. Suitable for use in standard tap holders and chucks accepting a 0.141 inch shank diameter across CNC and manual tapping setups requiring a 4-48 UNF 2B thread form.

Installation Notes

This tap should be installed by a qualified machinist or tooling technician familiar with tapping operations and cutting fluid selection for stainless steel and aerospace alloys. Always ensure the spindle and workpiece are secured before beginning the tapping cycle, and confirm proper tap holder alignment to avoid tool breakage in small-diameter applications. Coolant-through is not available on this tap, so external cutting fluid application is recommended to manage heat and chip evacuation. Follow applicable shop safety procedures and machine manufacturer guidelines when setting feed rates and spindle speeds.