Seco 00077974 Laydown Threading Insert 11.5 Tpi Npt

Product Description

The SECO 00077974 is a solid carbide laydown threading insert designed for cutting internal NPT threads at 11.5 threads per inch (TPI). Part of the Snap-Tap series, it carries the CP500 manufacturer grade and features a TiAlN/TiN finish applied via PVD coating process. The 60-degree included angle and A2 chipbreaker geometry suit precision threading operations in demanding materials. At 0.1366 inches thick with a 3/8-inch inscribed circle, this right-hand insert fits standard laydown toolholders used in CNC and manual threading applications. Installation is handled by machinists and tooling technicians in production or job-shop environments.

This insert is rated primarily for stainless steel workpieces (ISO material code M), where the TiAlN/TiN PVD coating provides wear resistance and heat management during the threading cycle. The internal NPT thread profile makes it applicable to pipe fitting and fluid-system component manufacturing, where accurate thread form and consistent TPI are critical. It is suited for shops producing or reworking NPT-threaded ports, couplings, and fittings in stainless and similar ferrous alloys.

Key Features

• Solid carbide construction with CP500 grade for durability in tough materials
• TiAlN/TiN PVD coating for improved wear resistance and surface finish
• 11.5 TPI internal NPT thread profile with 60-degree included angle
• A2 chipbreaker geometry for controlled chip flow in stainless steel
• Right-hand cut, laydown insert style (16NR) for standard compatible toolholders
• Corner radius of 0.0040 inches for accurate thread root form

Compatibility

Designed for use in laydown-style threading toolholders accepting the 16NR insert style. Confirm toolholder pocket dimensions and insert seat compatibility before installation. No specific toolholder models were identified in the product data.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Power down and lock out the machine spindle before seating or removing the insert. Use the appropriate torque wrench and manufacturer-specified clamping screw to secure the insert — do not overtighten, as carbide inserts are brittle. Verify thread form with a calibrated NPT go/no-go gauge after the first pass before committing to full production runs.