Description

The SECO 00077789 is a laydown threading insert designed for external ISO thread cutting on CNC lathes and turning centers. Built from micrograin solid carbide with a PVD-applied TiAlN/TiN coating, this insert handles right-hand external threading at a 3.0mm pitch with a 60-degree included angle. The CP500 grade is optimized for stainless steel and other difficult-to-machine materials. With a 3/8-inch (0.3750 inch) inscribed circle and a thickness of 0.1366 inches, it seats securely in compatible 16ER-style toolholders. Machinists and CNC operators in production and job-shop environments rely on this insert for repeatable thread form accuracy on ISO-standard profiles.

This insert is suited for external threading operations on stainless steel workpieces, classified under material grade M. The A2 chipbreaker geometry and Snap Tap series design make it a practical choice for turning centers running ISO-threaded components in both light and medium-duty production runs. The PVD coating process preserves edge sharpness and extends tool life when cutting heat-resistant and work-hardening alloys.

Key Features

Micrograin solid carbide substrate with PVD TiAlN/TiN coating for extended edge life on stainless steel
3.0mm ISO pitch, 60-degree included angle for standard external ISO thread profiles
Right-hand cutting geometry, 16ER insert style for use in standard laydown threading toolholders
A2 chipbreaker for controlled chip flow in stainless and M-grade materials
3/8-inch inscribed circle (0.3750 inch) with 0.1366-inch insert thickness for rigid seating
CP500 manufacturer grade, part of the Snap Tap series

Compatibility

Designed for use in 16ER-style laydown threading toolholders that accept 3/8-inch inscribed circle inserts with ISO external thread geometry.

Installation Notes

This insert is installed and replaced by a machinist or CNC tooling technician. Ensure the machine spindle is fully stopped and the turret is in a safe index position before changing inserts. Use the correct torque wrench or insert key specified by the toolholder manufacturer when securing the clamping screw do not overtighten. Inspect the insert pocket and clamping components for wear or debris before seating a new insert to maintain accurate thread form.