Carmex 16ER11.5NPTMXC/G Laydown Threading Insert Npt

Product Description

The CARMEX 16ER11.5NPTMXC/G is a solid carbide laydown threading insert designed for cutting right-hand external NPT threads on a lathe or threading machine. It runs at 11.5 threads per inch (TPI), matching the American National Standard Taper Pipe Thread (NPT) form used in fluid and gas piping systems across HVAC, plumbing, and industrial applications. The insert features a titanium nitride (TiN) finish applied over the carbide substrate to extend cutting edge life and reduce built-up edge. With a 3/8-inch inscribed circle (IC) and 0.146-inch thickness, it seats into compatible ER-style laydown toolholders without shimming. Installation is handled by machinists and toolroom technicians.

This insert is suited for threading operations on pipe fittings, nipples, valve bodies, and other components requiring NPT external threads. The 11.5 TPI pitch is standard for NPT sizes ranging from 1/8-inch to 2-inch nominal pipe, making this a versatile insert for job shops, production turning cells, and maintenance machining environments. It is sold individually but carries a minimum order quantity of 50 pieces, reflecting its use as a production consumable. The MXC grade designation indicates a coated micrograin carbide intended for a range of ferrous and non-ferrous materials.

Key Features

• Solid carbide construction with TiN coating for extended edge life
• Right-hand external NPT thread form at 11.5 TPI
• 3/8-inch inscribed circle fits standard ER-style laydown toolholders
• 0.146-inch insert thickness for positive seating without shimming
• MXC micrograin carbide grade suitable for a broad range of workpiece materials
• Laydown orientation for rigid, repeatable thread form engagement

Compatibility

Designed for use in ER-style laydown threading toolholders accepting a 3/8-inch IC insert with 0.146-inch thickness and an external NPT thread form profile.

Installation Notes

Installation is performed by a qualified machinist or toolroom technician. Ensure the lathe or CNC turning center is fully stopped and the spindle is locked before seating or replacing the insert. Use the correct torx or hex key torque driver specified by the toolholder manufacturer to clamp the insert - do not overtighten by hand or with standard wrenches. Verify thread form and pitch with a calibrated NPT thread gauge after the first pass before committing to full production runs.