Cleveland C55317 Spiral Point Tap 1/4-20 Unc Tin Hss

Product Description

The CLEVELAND C55317 is a spiral point tap designed for through-hole threading in metal workpieces. Built from high speed steel with a titanium nitride (TiN) coating, this 1/4-20 UNC plug tap delivers reliable thread cutting performance in production and maintenance environments. The spiral point geometry pushes chips forward ahead of the cutting action, keeping the flutes clear and reducing the risk of chip-related tap breakage. With a 2-flute design and H5 thread limit, it is suited for close-tolerance threading applications requiring a Class 2B fit. Machinists, tool-and-die techs, and maintenance professionals install this tap in drill presses, CNC machining centers, and hand-tapping setups.

The C55317 is intended for through-hole threading in alloy steel, carbon steel, and aluminum. The plug chamfer — typically 3 to 5 threads — provides a gradual lead-in that eases entry into the workpiece and distributes cutting load across multiple teeth. It is well suited for general-purpose production tapping where through-holes are the standard condition. The H5 thread limit accommodates standard 2B class fits commonly specified in general engineering and structural fastener applications.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole threading
• High speed steel construction provides toughness and wear resistance
• TiN coating reduces friction and extends tool life in steel and aluminum
• Plug chamfer for standard lead-in in through-hole applications
• H5 thread limit for Class 2B fit tolerance
• Right-hand thread cutting direction

Compatibility

Designed for through-hole threading in alloy steel, aluminum, and carbon steel. Compatible with 1/4-20 UNC thread specifications requiring a Class 2B fit.

Installation Notes

This tap should be installed by a qualified machinist or maintenance technician familiar with threading operations. Always secure the workpiece and ensure the tap is properly aligned with the drilled hole before applying cutting force. Use an appropriate cutting fluid for the workpiece material to reduce heat and extend tool life. Follow shop safety procedures and inspect the tap for wear or chipping before each use.