Carmex 16IR12STACMEMXC Threading Insert 12 Tpi Stub Acme

Product Description

The CARMEX 16IR12STACMEMXC is a solid carbide laydown threading insert designed for internal Stub Acme thread cutting at 12 threads per inch (TPI). It features a micrograin carbide substrate with a PVD-applied titanium nitride (TiN) coating and carries the MXC manufacturer grade. The insert is right-hand orientation with a 29-degree included angle, a 3/8-inch inscribed circle (0.3750 inches), and a thickness of 0.146 inches. This insert is used by machinists and CNC operators requiring precise, repeatable internal Stub Acme threads on a wide range of workpiece materials.

This insert is suited for internal threading operations across a broad material range, including ferrous, non-ferrous, stainless, heat-resistant alloys, and cast materials, as indicated by the universal primary workpiece material classification (H, K, M, N, P, S material codes). It is appropriate for both manual and CNC turning centers where Stub Acme thread profiles are required in production or job-shop environments. The laydown-style seating provides stable, repeatable positioning in compatible 16IR-style toolholders.

Key Features

• Solid carbide micrograin substrate for wear resistance and edge stability
• PVD TiN coating extends tool life across diverse workpiece materials
• Right-hand internal Stub Acme thread profile at 12 TPI with 29-degree included angle
• 3/8-inch inscribed circle (0.3750 inches) for precise toolholder fit
• Universal material compatibility covering codes H, K, M, N, P, and S
• CE certified; manufactured under ISO 13485:2016, ISO 14001:2015, and ISO 45001 quality and environmental management systems

Compatibility

Designed for use in 16IR-style internal threading toolholders. Compatible with turning centers and lathes requiring a laydown insert with a 3/8-inch inscribed circle seating format for Stub Acme internal threading applications.

Installation Notes

This insert should be installed and indexed by a qualified machinist or CNC tooling technician. Power down and lock out the machine before changing inserts. Use the correct insert screw torque driver specified by the toolholder manufacturer to avoid cracking the carbide substrate. Inspect the toolholder pocket for wear or debris before seating a new insert.