Seco 00078289 Threading Insert 4 Tpi Stub Acme CP500

Product Description

The SECO 00078289 is a solid carbide laydown threading insert designed for internal Stub Acme thread cutting at 4 threads per inch (TPI). Part of the Snap Tap series, it carries the CP500 manufacturer grade and features a TiAlN/TiN PVD coating for extended tool life across a wide range of workpiece materials. The insert has a 29-degree included angle, an inscribed circle of 15.88 mm (0.6252 inches), and a thickness of 6.15 mm (0.2421 inches). Right-hand cutting geometry makes it suitable for standard internal threading operations on lathes and turning centers. It is installed and changed by machinists and CNC tooling technicians.

This insert is intended for internal Stub Acme thread forms at 4 TPI on turning and threading equipment. The CP500 grade with PVD coating supports universal workpiece material classifications including cast iron, stainless steel, non-ferrous materials, steel, and superalloys, corresponding to ISO material codes K, M, N, P, and S. It is well suited for production environments where repeatable thread form accuracy and insert longevity are priorities. The Snap Tap series designation indicates compatibility with corresponding Snap Tap insert holders and tooling systems.

Key Features

• Solid carbide construction with TiAlN/TiN PVD coating for wear resistance
• 4 TPI Internal Stub Acme thread form with 29-degree included angle
• CP500 manufacturer grade rated for universal ISO workpiece material groups K, M, N, P, and S
• Right-hand cutting orientation for standard internal threading operations
• Inscribed circle of 15.88 mm (0.6252 inches) and thickness of 6.15 mm (0.2421 inches)
• Snap Tap series insert for use with compatible Snap Tap toolholders

Compatibility

Designed for use with Snap Tap series toolholders that accept the 27NR insert style. Suitable for internal Stub Acme threading applications across ISO material groups K, M, N, P, and S.

Installation Notes

Insert seating and clamping should be performed with the machine spindle fully stopped and the toolholder secured in the turret or tool post. Use the appropriate torx or hex key specified by the toolholder manufacturer when tightening the clamping screw — do not overtighten. Verify insert orientation and seating before resuming cutting operations. Follow your facility and machine tool manufacturer guidelines for insert indexing and disposal of worn carbide tooling.