Kennametal 1540479 Spiral Point Tap 5-40 Unc Hss

Product Description

The KENNAMETAL 1540479 is a spiral point tap designed for threading 5-40 UNC holes in a range of materials including cast iron, ductile iron, and non-ferrous metals. This two-flute plug chamfer tap is manufactured from high speed steel (HSS) with a bright, uncoated finish. It carries an H2 thread limit and a 2B/3B class of fit, making it suitable for standard tolerance threading applications. The spiral point geometry pushes chips forward ahead of the tap, reducing chip clogging in through-hole applications. Licensed machinists, toolroom technicians, and maintenance mechanics install this tap in production and repair environments.

The 1540479 is intended for through-hole tapping operations in cast iron, ductile iron, and non-ferrous metal workpieces. The plug chamfer provides a gradual lead-in over several threads, making it appropriate for both machine tapping and hand tapping in general-purpose manufacturing, maintenance, and fabrication settings. It fits standard tap holders and driver adapters sized for the 0.141-inch shank diameter. This tap is suited for light-duty CNC machining centers, drill presses, and tapping arms where chip evacuation in through-hole work is a priority.

Key Features

• Spiral point geometry pushes chips forward, reducing clogging in through-hole tapping
• High speed steel construction provides durability across cast iron, ductile iron, and non-ferrous materials
• Plug chamfer (3-5 thread lead-in) for smooth thread starts in machine and hand tapping
• H2 thread limit with 2B/3B class of fit for standard tolerance threaded fastener holes
• Bright, uncoated finish — ready to use as supplied or compatible with aftermarket coatings
• Right-hand thread direction, no coolant-through requirement

Compatibility

Designed for use in standard 5-40 UNC through-hole tapping applications in cast iron, ductile iron, and non-ferrous metal. Compatible with tap holders accepting a 0.141-inch shank diameter. Part of the Kennametal Series 5301 tap line.

Installation Notes

This tap should be installed in a properly sized tap holder or collet matched to the 0.141-inch shank diameter before use. Always ensure the workpiece is securely fixtured and the tap is aligned perpendicular to the hole to prevent tap breakage. Apply appropriate cutting fluid for the workpiece material before tapping. Follow shop safety procedures and machine manufacturer guidelines when operating tapping equipment.