Seco 00046139 Threading Insert 28 Tpi 1/4 in Ic CP500

Product Description

The SECO 00046139 is a laydown threading insert designed for right-hand internal UN thread cutting at 28 threads per inch (TPI). Built from solid carbide with a CP500 manufacturer grade, it carries a TiAlN/TiN PVD finish applied through a physical vapor deposition process. With a 1/4-inch inscribed circle and a thickness of 0.1181 inches, this insert fits standard laydown toolholders used in precision threading operations. The 60-degree included angle matches the UN thread form. It is part of the Snap-Tap series and is suited for use on a broad range of workpiece materials including cast iron, non-ferrous metals, steel, and heat-resistant alloys.

This insert is intended for CNC lathe and turning center applications where internal threading operations require consistent thread form accuracy. The 28 TPI specification targets fine-thread fastener features common in mechanical assemblies. The universal material compatibility rating makes it a practical choice for machine shops running mixed-material jobs. Installation is performed by qualified machinists or CNC programmers in a shop environment. This item is sold individually per package with a minimum order quantity of 2 units.

Key Features

• Solid carbide construction with CP500 grade for wear resistance in threading applications
• TiAlN/TiN PVD coating applied for heat resistance and extended edge life
• 28 TPI internal UN thread form with 60-degree included angle
• Right-hand cut geometry for standard internal threading operations
• 1/4-inch inscribed circle with 0.1181-inch thickness for laydown toolholder compatibility
• Universal primary workpiece material rating covering cast iron, non-ferrous, steel, and superalloys

Compatibility

Designed as a laydown-style threading insert compatible with standard 11NR-style toolholders used for right-hand internal UN thread cutting at 28 TPI.

Installation Notes

Installation is performed by a machinist or CNC tooling technician. Power down and lock out the machine spindle before seating or removing the insert. Ensure the toolholder pocket is clean and free of debris before clamping the insert to prevent seating errors. Follow the toolholder manufacturer torque guidance for the clamping screw to avoid insert cracking.