Seco 03245439 Laydown Threading Insert 16ER20UN-A TTP2050

Product Description

The SECO 03245439 is a solid carbide laydown threading insert designed for external UN thread cutting on CNC lathes and turning centers. Designated style 16ER with a 20 threads-per-inch pitch, it carries the TTP2050 grade with a PVD-applied TiAlN/TiSiN coating engineered for wear resistance and edge stability across a wide range of workpiece materials. The insert produces a 60-degree included angle standard to UN thread forms and features a right-hand cutting orientation. With a 3/8-inch inscribed circle and a 0.1366-inch thickness, it seats reliably in compatible ER-style laydown toolholders. Machinists and CNC operators performing precision threading operations rely on this insert for consistent thread geometry over multiple passes.

This insert is suited for external UN threading in both production and jobshop turning environments. It is classified for universal primary workpiece material compatibility, covering material codes K, M, P, and S, which span cast iron, stainless steel, steel, and heat-resistant superalloys. The Snap Tap series chipbreaker code A geometry controls chip flow during threading passes. Typical applications include threading shafts, fasteners, fittings, and hydraulic components on manual or CNC lathes where UN thread standards are required. The ISO-standard geometry ensures the insert profile conforms to recognized thread-form specifications.

Key Features

• Solid carbide micrograin substrate with PVD TiAlN/TiSiN coating for extended tool life
• 16ER style, 20 TPI, 60-degree included angle for standard UN external thread forms
• Right-hand cutting orientation, laydown seating configuration
• 3/8-inch inscribed circle, 0.1366-inch thickness for precise toolholder fit
• Three cutting teeth per side with chipbreaker code A geometry
• Universal material grade compatibility: K, M, P, and S workpiece codes

Compatibility

Designed as an OEM-style replacement threading insert for ER-style laydown toolholders accepting 16ER inserts with a 3/8-inch inscribed circle and 20 TPI UN thread profile.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Ensure the machine spindle is fully stopped and the turret or toolpost is de-energized before seating or removing the insert. Verify the insert pocket and clamping screw are clean and free of chips before torquing the clamp to the toolholder manufacturer's specified value. Inspect the seating surface and cutting edges before initiating a threading cycle.