Carmex 16IR12STACMEP30 Threading Insert 12 Tpi Stub Acme

Product Description

The CARMEX 16IR12STACMEP30 is a laydown-style solid carbide threading insert engineered for right-hand internal Stub Acme thread cutting at 12 threads per inch. Built to the 16IR insert style, it features a 3/8-inch (0.3750-inch) inscribed circle and a thickness of 0.1460 inches. The P30 manufacturer grade and C5 material grade make this insert well suited to machining operations where carbide toughness and wear resistance matter. It is uncoated, which allows for consistent performance in applications where coating adhesion or re-grinding compatibility is a priority. Machinists and toolroom professionals install this insert into compatible laydown threading toolholders for internal thread generation.

This insert is designed for internal Stub Acme threading operations, a thread form widely used in power transmission components such as lead screws, jacks, and linear actuators. At 12 TPI, it produces the coarse-pitch Stub Acme profile required for applications demanding high load capacity with reduced thread height compared to full-depth Acme forms. It is suitable for use in CNC lathes and manual turning centers outfitted with appropriate 16IR-style laydown toolholders. Right-hand cutting orientation applies. Sold individually; minimum order quantity is 10 units.

Key Features

• 16IR laydown insert style for use with compatible internal threading toolholders
• Solid carbide construction at P30 grade for a balance of hardness and toughness
• Right-hand internal Stub Acme thread profile at 12 TPI
• Uncoated finish suitable for applications where bare carbide is preferred
• 3/8-inch inscribed circle (0.3750 inches) with 0.1460-inch thickness
• C5 material grade designation for reference in tooling specification

Compatibility

Designed for use with 16IR-style laydown threading toolholders configured for internal turning operations. Confirm toolholder seat geometry and clamping compatibility before installation.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully stopped and the toolholder is secured in the turret before seating or removing the insert. Use the correct torque wrench and clamp screw specified by the toolholder manufacturer - do not overtighten, as carbide inserts are brittle and can crack under excessive clamping force. Verify insert orientation matches the right-hand cutting direction before engaging the workpiece.