Kennametal 1712671 Threading Insert Npt 11.5 Tpi Carbide

Product Description

The KENNAMETAL 1712671 is a laydown threading insert designed for cutting internal NPT threads on a lathe or CNC turning center. Identified by ISO code LT16NR115NPTCB and manufactured in grade KC5025, this solid carbide insert carries a PVD-applied TiAlN coating that resists heat and wear during continuous and interrupted threading passes. It cuts at 11.5 threads per inch, matching the NPT taper thread standard used throughout pipe and fitting applications. The right-hand cutting geometry, 3/8-inch inscribed circle, and 0.1430-inch thickness place it in the standard LT16 insert family. Licensed machinists and CNC operators working on fluid-system components install this insert in compatible laydown-style threading toolholders.

This insert is suited for threading internal NPT connections in steel, stainless steel, cast iron, superalloys, and titanium workpieces. Typical applications include machining pipe fittings, valve bodies, manifold ports, and hydraulic or pneumatic system components where a leak-resistant tapered thread is required. The KC5025 grade is engineered to handle the demanding chip loads and workpiece hardness ranges common across these materials, making it a versatile choice for job shops and production environments running mixed-material threading operations.

Key Features

• Solid carbide construction in KC5025 grade for wear resistance across a broad material range
• PVD TiAlN coating improves thermal stability and extends tool life in high-speed threading
• 11.5 TPI geometry matches NPT taper thread standard for pipe and fitting connections
• Right-hand, internal cutting orientation with CB chipbreaker geometry
• 3/8-inch (9.53 mm) inscribed circle in the LT16 insert size family
• Rated for steel, stainless steel, cast iron, superalloys, and titanium workpieces

Compatibility

Designed as an OEM-style replacement laydown threading insert for LT16-series toolholders configured for internal NPT threading applications.

Installation Notes

Installation is performed by a qualified machinist or CNC operator. Power down and de-energize the machine before seating or replacing the insert. Secure the insert in its toolholder pocket per the toolholder manufacturer's torque specification and verify seating before running. Confirm correct thread pitch and taper with a calibrated NPT thread gauge after the first pass before proceeding to full production.