Kennametal 1542894 Spiral Point Tap 5/8-11 Unc Hss

Product Description

The KENNAMETAL 1542894 is a spiral point tap designed for cutting internal threads in through-hole applications. Built from high speed steel (HSS) with a bright, uncoated finish, this tap uses a plug chamfer entry to progressively engage the workpiece and push chips forward and out of the hole. It cuts a 5/8-11 UNC thread to a 3B class of fit with an H3 thread limit, making it suitable for standard-tolerance fastener applications. Three flutes provide chip clearance and cutting efficiency in the materials this tap is rated for. Licensed HVAC, plumbing, and mechanical tradespeople working with structural or pipe fittings will recognize this as a standard production tap geometry.

This tap is rated for use in cast iron, ductile iron, and non-ferrous metals. The spiral point design is best suited for through-hole tapping where chips can be expelled ahead of the tap rather than packed into a blind pocket. The plug chamfer allows for straightforward machine tapping in production or repair environments. At 3.81 inches overall length with a 1.813-inch thread length and a 0.48-inch shank diameter, it fits standard tap holders used in drill presses, CNC machining centers, and tapping arms.

Key Features

• Spiral point geometry pushes chips forward, ideal for through-hole tapping
• 5/8-11 UNC thread form, 3B class of fit, H3 thread limit for standard tolerance applications
• High speed steel construction provides toughness across a range of workpiece hardnesses
• Plug chamfer for progressive thread engagement and reduced entry force
• Bright, uncoated finish — no coating buildup to affect thread tolerance
• Rated for cast iron, ductile iron, and non-ferrous metals

Compatibility

Designed for through-hole tapping in cast iron, ductile iron, and non-ferrous metal workpieces requiring a 5/8-11 UNC internal thread to a 3B class of fit. Part of KENNAMETAL Series 5301.

Installation Notes

Secure the tap in a properly sized tap holder or collet matched to the 0.48-inch shank before operation. Power down or lock out any machine before changing taps. Use an appropriate cutting fluid for the workpiece material — dry tapping is not recommended for most metals even with an uncoated HSS tap. Ensure the through-hole is drilled to the correct tap drill diameter for 5/8-11 UNC before starting.