Carmex 16IR6STACME P25C Threading Insert 6 Tpi Stub Acme

Product Description

The CARMEX 16IR6STACME P25C is a solid carbide laydown threading insert designed for internal Stub Acme thread cutting at 6 threads per inch (TPI). Manufactured in the P25C grade with a C5 material grade and a PVD-applied TiN coating, this insert delivers reliable wear resistance and thermal stability in demanding threading operations. The right-hand orientation and 3/8 inch inscribed circle make it a standard fit for a wide range of internal threading toolholders. Machinists and CNC operators use this insert for precision threading in medium-duty turning and boring applications where Stub Acme thread profiles are required.

This insert is suited for internal Stub Acme threading operations on CNC lathes and manual turning centers. The Stub Acme thread form is commonly specified in lead screw assemblies, linear actuators, power transmission components, and machine tool applications where a coarser, lower-profile thread is preferred over a full Acme form. The P25C grade targets steel and general-purpose materials at moderate cutting parameters, making it appropriate for production threading environments.

Key Features

• Solid carbide construction in P25C grade (C5 material grade) for toughness and edge stability
• PVD TiN coating for reduced friction and improved tool life in steel threading
• Internal Stub Acme thread form, right-hand cutting orientation
• 6 TPI thread pitch for coarse Stub Acme profiles
• 3/8 inch inscribed circle (0.3750 inch) for compatibility with standard 16IR toolholders
• Laydown insert style for positive seating and repeatable thread depth

Compatibility

Designed for use with 16IR-style internal threading toolholders that accept a 3/8 inch inscribed circle laydown insert. Suitable for right-hand internal Stub Acme threading at 6 TPI.

Installation Notes

This insert is installed by a machinist or CNC tooling technician into a compatible 16IR toolholder. Power down and lock out the machine before seating or replacing inserts. Ensure the insert pocket and clamping screw are clean and free of chips before installation to maintain proper seating depth and thread accuracy. Do not exceed the toolholder manufacturer's recommended clamping torque for carbide inserts.