Kennametal 1743741 Threading Insert 12 Tpi Unj KC5025

Product Description

The KENNAMETAL 1743741 is a solid carbide laydown threading insert designed for external UNJ thread cutting at 12 threads per inch (TPI). Carrying the KC5025 manufacturer grade, this insert features a PVD-applied TiAlN coating that supports cutting performance on steel, stainless steel, cast iron, superalloys, and titanium. It uses an ER insert style with a size code of 16 and a 3/8-inch (9.53 mm) inscribed circle. The insert is right-hand cutting and seats in standard laydown-style toolholders. Licensed machinists and CNC lathe operators install these inserts in production and maintenance turning operations where UNJ thread form accuracy is required.

This insert is suited for external UNJ threading on turned components in aerospace, oil and gas, and precision machining environments. UNJ threads feature a controlled root radius that increases fatigue strength compared to standard UN thread forms, making this insert a common choice for safety-critical fastener and fitting applications. The 12 TPI pitch covers a range of medium-diameter fastener and coupling threads. The TiAlN PVD coating provides thermal stability and wear resistance at elevated cutting speeds across the supported workpiece materials.

Key Features

• KC5025 carbide grade with PVD TiAlN coating for wear resistance on steel, stainless steel, cast iron, superalloys, and titanium
• Right-hand external UNJ thread form at 12 TPI
• ER insert style, size code 16, fits standard laydown threading toolholders
• 3/8-inch (9.53 mm) inscribed circle for consistent seating and repeatability
• Thickness of 0.1430 inches (3.44 mm) for stable laydown positioning
• Hole diameter of 0.1551 inches (3.94 mm) for secure clamping screw engagement

Compatibility

Designed for use in laydown threading toolholders that accept ER-style size 16 inserts with a 3/8-inch inscribed circle. Compatible workpiece materials include steel, stainless steel, cast iron, superalloys, and titanium as specified by the manufacturer.

Installation Notes

Installation is performed by qualified machinists or CNC turning center operators. Power down and lock out the machine spindle before changing inserts. Seat the insert fully in the pocket and torque the clamping screw to the toolholder manufacturer's specification. Inspect the insert pocket and shim for wear or damage before installing a new insert to ensure proper thread form geometry.