Kennametal 1544856 Spiral Point Tap 7/16-14 Unc Tin

Product Description

The KENNAMETAL 1544856 is a spiral point tap designed for right-hand threading in through-hole applications. It cuts a 7/16-14 UNC thread and is manufactured from high speed steel (HSS) with a titanium nitride (TiN) coating for extended tool life and reduced friction. The plug chamfer provides a gradual lead-in, distributing cutting forces across multiple teeth. With a 3-flute geometry and spiral point design, this tap pushes chips forward ahead of the cut rather than packing them in the flute, making it well suited to production tapping in through holes. Overall length is 3.16 inches with a thread length of 1.438 inches.

This tap is intended for use in materials including cast iron, ductile iron, stainless steel, and steel. The H3 thread limit designates a controlled oversize tolerance suitable for standard UNC fits in these materials. It is a fractional inch tool used in machine tapping operations on drill presses, CNC machining centers, and dedicated tapping machines in industrial, commercial, and job-shop environments. The 0.323-inch shank diameter is sized for standard tap holders and collet chucks in that range.

Key Features

• 7/16-14 UNC right-hand thread form with H3 thread limit for controlled tolerance
• Spiral point geometry pushes chips forward, reducing clogging in through-hole tapping
• 3-flute plug chamfer design distributes cutting load for smoother entry
• High speed steel construction with TiN coating for wear resistance and longer tool life
• Rated for cast iron, ductile iron, stainless steel, and steel applications
• No coolant-through requirement simplifies setup on standard machines

Compatibility

Designed as a machine tap for through-hole 7/16-14 UNC applications in cast iron, ductile iron, stainless steel, and steel workpieces. Compatible with standard tap holders and collet chucks accepting a 0.323-inch shank diameter.

Installation Notes

This tap is intended for installation by machinists and tool-and-die professionals using a drill press, CNC machining center, or dedicated tapping machine. Ensure the tap holder is properly aligned to the drilled hole before engaging the cut to prevent tap breakage. Use appropriate cutting fluid for the workpiece material, particularly when tapping stainless steel or ductile iron. Always verify the pilot hole diameter matches the recommended tap drill size for 7/16-14 UNC before tapping.