Tool-flo 500B6616AC22A Threading Insert 16UN 16 Tpi

Product Description

The TOOL-FLO 500B6616AC22A is a solid carbide laydown threading insert designed for right-hand external UN thread cutting at 16 threads per inch (TPI). Manufactured to the 16ER insert style with an AC22R grade and an AlTiN PVD coating, this insert delivers hard, wear-resistant performance on ferrous and non-ferrous materials. The 3/8 inch inscribed circle (IC) geometry provides consistent tool engagement, while the chipbreaker (CB) design supports controlled chip evacuation during threading operations. Machinists and tool-and-die professionals working on CNC lathes and turning centers are the primary users of this insert.

This insert is suited for external threading operations on UN-standard fasteners, fittings, and machined components in manufacturing, repair, and production environments. The 16 TPI specification makes it a common choice for threading operations on standard UN coarse and fine series profiles. It is appropriate for use in both job shop and high-volume production settings where consistent thread form and surface finish are required on external diameters.

Key Features

• Solid carbide construction with AC22R manufacturer grade for wear resistance
• AlTiN PVD coating for elevated heat resistance and extended tool life
• 16 TPI UN thread standard, right-hand external cutting geometry
• 3/8 inch inscribed circle for precise insert seating and repeatability
• Chipbreaker (CB) design promotes controlled chip flow during threading passes
• Single cutting edge per side; cutting edge to theoretical edge length of 0.0300 inches

Compatibility

Designed as an OEM-style replacement threading insert for toolholders accepting 16ER-style laydown inserts used in external UN thread turning applications.

Installation Notes

Installation is performed by machinists or tooling technicians on CNC or manual lathes. The machine spindle must be stopped and all motion axes locked before inserting or replacing the insert. Seat the insert firmly in the toolholder pocket and verify clamping torque is applied per the toolholder manufacturer specification. Confirm thread pitch and insert orientation against the workpiece drawing before initiating a threading pass.