Kennametal 4176020 Threading Insert NA3R12 KCU10 Carbide

Product Description

The KENNAMETAL 4176020 is a carbide threading insert designed for precision thread-cutting operations on both internal and external Acme-standard threads. It carries the KCU10 manufacturer grade and features a PVD-applied AlTiN finish that supports extended tool life under demanding cutting conditions. The insert follows the Top Notch series profile with an NA style and is configured for right-hand cutting at 12 threads per inch (TPI) with an included angle of 29 degrees. The cutting tip width measures 0.0283 inches and the corner radius is 0.005 inches, making it suited for clean, accurate Acme thread profiles on ferrous and non-ferrous workpiece materials.

This insert is used in CNC lathes, manual engine lathes, and threading toolholders that accept the Top Notch insert system. Typical applications include machining Acme lead screws, power transmission components, and mechanical actuator threads in both production and job shop environments. It handles internal and external threading passes, making it a versatile choice for machinists working across a range of part programs that specify Acme thread forms.

Key Features

• Carbide substrate with PVD AlTiN coating for wear resistance and thermal stability
• Right-hand cutting orientation for standard lathe threading passes
• 12 TPI pitch rated for Acme thread standard, internal and external application
• 29-degree included angle matches Acme thread form geometry precisely
• Corner radius of 0.005 inches for controlled thread root finish
• Top Notch series insert style for compatibility with Top Notch toolholders

Compatibility

Designed for use in Top Notch series threading toolholders that accept NA-style inserts with insert size 3. Verify toolholder insert pocket geometry and clamping specifications before installation.

Installation Notes

This insert is installed and serviced by machinists or tool-and-die professionals. Power down and lock out the machine spindle before seating or removing any insert. Ensure the insert pocket and clamping screw are clean and free of chips before installation. Do not exceed the toolholder manufacturer's recommended cutting parameters for this insert style and grade.