Carmex 20500152 Threading Insert 8 Tpi 1/2 in Ic Buttress

Product Description

The CARMEX 20500152 is a solid carbide laydown threading insert designed for cutting right-hand external American Buttress threads at 8 threads per inch (TPI). The insert carries a TiAlN coating applied via PVD process, which increases surface hardness and heat resistance for extended tool life under high-speed threading conditions. With a 1/2-inch inscribed circle (IC) and a thickness of 0.187 inches, this insert fits standard 22 ER style toolholders. It is intended for machinists and CNC lathe operators producing Buttress thread profiles on external workpieces in both production and job-shop environments.

This insert is suited for threading operations on CNC and manual lathes where American Buttress thread forms are specified. Buttress threads are commonly found on high-load unidirectional applications such as hydraulic cylinders, vises, and heavy-duty mechanical assemblies. The 22 ER style and 8 TPI specification make it a practical choice for medium-to-large diameter external threading passes where thread form accuracy and insert rigidity are critical to finished part quality.

Key Features

• Solid carbide construction in grade BMA for wear resistance and edge stability
• TiAlN coating via PVD process for improved heat resistance and extended tool life
• 8 TPI American Buttress external thread profile, right-hand cut
• 1/2-inch inscribed circle for compatibility with 22 ER style toolholders
• Corner radius of 0.007 inches for defined thread root geometry
• Laydown insert style for secure, repeatable seating in the pocket

Compatibility

Designed for use in 22 ER style threading toolholders that accept laydown inserts with a 1/2-inch inscribed circle and 0.187-inch thickness.

Installation Notes

Installation is performed by a machinist or CNC tooling technician. Ensure the lathe is fully stopped and the spindle is locked before seating or removing the insert. Use the correct torx or hex key to the toolholder manufacturer's specified fastener procedure when clamping the insert in the pocket. Inspect the insert pocket for chips or debris before seating to avoid rocking, which can cause premature edge failure or thread form error.