Kennametal 4176207 Threading Insert 8 Tpi Altin Carbide

Product Description

The KENNAMETAL 4176207 is a Top Notch series external threading insert designed for cutting UN-standard threads at 8 TPI on a right-hand pass. It is manufactured from carbide with a PVD-applied AlTiN finish, which provides heat resistance and extended tool life in ferrous and hard-to-machine materials. The insert carries the KCU10 manufacturer grade designation and features an NTC3R8E style profile with a 60-degree included angle and a corner radius of 0.0161 inches (0.41 mm). Thickness is 0.195 inches (4.95 mm). It is installed and indexed by machinists and CNC operators working on turning centers, manual lathes, and OD threading applications in production or job-shop environments.

This insert is suited for external UN thread production at 8 TPI in applications ranging from fastener manufacturing to precision component threading. The AlTiN coating supports dry or minimal-coolant cutting strategies at elevated speeds. The Top Notch system uses a secure insert-clamping design that allows repeatable indexing without full tool disassembly, making it a common choice on production lathes where cycle time and insert changeover speed matter. Insert size is 3, consistent with the Top Notch toolholder family for that size range.

Key Features

• Carbide substrate with PVD AlTiN finish for heat and wear resistance
• 8 TPI external thread form, UN standard, 60-degree included angle
• Right-hand cutting orientation
• Corner radius 0.0161 inches (0.41 mm) for accurate thread root geometry
• Top Notch series insert style NTC3R8E for secure, repeatable indexing
• KCU10 grade suited for a range of ferrous and wear-resistant workpiece materials

Compatibility

Designed for use with KENNAMETAL Top Notch series toolholders accepting size 3 inserts in external threading configurations. Confirm toolholder compatibility with the NTC insert style before ordering.

Installation Notes

Installation is performed by machinists following standard insert-indexing procedures for Top Notch clamping toolholders. Power down and lock out the machine spindle before changing inserts. Use the correct torque wrench or clamp key specified for the toolholder to secure the insert without cracking the carbide. Inspect the insert seat and clamp for debris before seating a new insert.