Seco 00077979 Threading Insert 12 Tpi Un Solid Carbide

Product Description

The SECO 00077979 is a laydown threading insert designed for right-hand internal UN threading operations. Built from micrograin solid carbide with a TiAlN/TiN PVD coating, this insert delivers consistent thread form and edge retention when cutting internal unified national (UN) thread profiles at 12 threads per inch (TPI). The 60-degree included angle conforms to standard UN thread geometry. The A2 chipbreaker geometry promotes controlled chip evacuation in blind and through-hole applications. Licensed HVAC, plumbing, and mechanical trade professionals working in precision machining environments will recognize the CP500 grade as optimized for demanding cutting conditions.

This insert is suited for internal threading applications where stainless steel is the primary workpiece material (ISO material code M). The Snap Tap series designation indicates compatibility with laydown-style toolholders accepting 16NR-profile inserts. Typical install scenarios include CNC lathes and manual turning centers performing single-point threading passes on stainless steel components such as fittings, couplings, and valve bodies. The right-hand cutting orientation and 3/8-inch inscribed circle fit a common range of internal threading toolholder bores.

Key Features

• Micrograin solid carbide substrate with PVD TiAlN/TiN coating for extended tool life in stainless steel
• 12 TPI UN internal thread form with 60-degree included angle
• A2 chipbreaker geometry for controlled chip management in internal bores
• Right-hand cutting orientation for standard internal threading passes
• CP500 manufacturer grade rated for ISO M workpiece materials (stainless steel)
• Conforms to ISO standards for insert geometry and dimensional tolerances

Compatibility

Designed for use with laydown-style internal threading toolholders accepting the 16NR insert profile. Intended for right-hand internal UN thread applications at 12 TPI in stainless steel and similar ISO M-grade workpiece materials.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Power down and lock out the machine spindle before seating or replacing the insert. Ensure the toolholder pocket is clean and free of chips before seating the insert to maintain proper seating depth and thread form accuracy. Minimum order quantity for this insert is 2 pieces; individual packages contain 1 insert.