Seco 00078178 Laydown Threading Insert 4 Tpi Acme

Product Description

The SECO 00078178 is a solid carbide laydown threading insert designed for cutting internal Acme threads on CNC lathes and threading equipment. Carrying the CP500 grade designation with a PVD-applied TiAlN/TiN coating, this insert delivers consistent thread form on a broad range of workpiece materials. It produces a right-hand internal Acme thread form at 4 threads per inch with a 29-degree included angle. The 27NR insert style fits standard laydown toolholders in the Snap Tap series. Machinists and tool-and-die professionals rely on this geometry for precision lead-screw and power-transmission threading applications.

This insert is suited for internal threading operations on materials spanning cast iron, non-ferrous metals, plastics, and steel, consistent with its Universal primary workpiece material rating and K, M, N, P, and S material grade codes per ISO classification. Typical applications include threading bores for lead screws, power-transmission components, and mechanical actuator housings where the Acme thread standard is specified. The 5/8-inch inscribed circle and 0.2421-inch thickness match the dimensional requirements of 27-series laydown toolholders used in production turning environments.

Key Features

• Solid carbide micrograin substrate in CP500 grade for extended tool life
• PVD TiAlN/TiN coating for heat resistance and reduced built-up edge
• Right-hand internal Acme thread form at 4 TPI with 29-degree included angle
• 27NR insert style for compatibility with standard Snap Tap laydown toolholders
• Universal material rating covering ISO material groups K, M, N, P, and S
• ISO-standard insert geometry for consistent, repeatable thread form

Compatibility

Designed for use in 27-series laydown threading toolholders within the Snap Tap series that accept a 5/8-inch inscribed circle insert with a thickness of 0.2421 inches.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician with the machine in a powered-down and locked-out state before changing inserts. Seat the insert fully in the pocket and torque the clamping screw according to the toolholder manufacturer specification. Inspect the insert pocket for chips or damage before seating a new insert to ensure proper support and thread-form accuracy. Minimum order quantity for this insert is 2 units; package quantity is 1.