Kennametal 1542897 Spiral Point Tap 5/8-18 Unf Hss

Product Description

The KENNAMETAL 1542897 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 plug-chamfer tap drives chips forward ahead of the cutting zone, reducing clogging and allowing clean thread formation at production feed rates. It cuts 5/8-18 UNF right-hand threads to a 3B class of fit with an H3 thread limit, delivering consistent tolerance control across repeated operations. With an overall length of 3.813 inches and a thread length of 1.813 inches, it is suited for use in standard tap handles, CNC tapping heads, and drill press setups.

This tap is intended for threading through-holes in cast iron, ductile iron, and non-ferrous metals. The spiral point geometry makes it especially effective in production environments where chip evacuation is a priority and material feed-through is possible. It is appropriate for both manual tapping operations and machine tapping on lathes, mills, and CNC machining centers. The 3-flute configuration balances cutting efficiency with core strength, making it a reliable choice for mid-range thread sizes in the 5/8-inch class.

Key Features

• Spiral point geometry drives chips forward for efficient through-hole tapping
• 5/8-18 UNF thread form, right-hand cut, H3 thread limit, 3B class of fit
• High speed steel construction for durability across cast iron and non-ferrous materials
• Bright uncoated finish suitable for use with standard cutting fluids
• 3-flute plug chamfer design balances chip clearance and tap body strength
• Fractional inch measurement series 5301 for standardized tooling inventory

Compatibility

Designed for through-hole tapping in cast iron, ductile iron, and non-ferrous metal workpieces requiring 5/8-18 UNF internal threads to a 3B class of fit.

Installation Notes

This tap is installed by machinists and tool-and-die professionals using standard tap wrenches, tapping heads, or CNC rigid tapping cycles. Secure the workpiece fully before tapping and confirm through-hole clearance is adequate for chip evacuation. Apply an appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Inspect tap condition regularly and replace before chipping or wear degrades thread tolerance.