Kennametal 4176018 Threading Insert Acme 8 Tpi Left Hand

Product Description

The KENNAMETAL 4176018 is a carbide threading insert in the Top Notch series, designed for cutting Acme thread forms at 8 threads per inch (TPI). Manufactured to the NA3L8 style and offered in the KCU10 grade, this insert features a Physical Vapor Deposition (PVD) applied AlTiN finish for enhanced wear resistance and thermal stability. It is configured for left-hand threading on both internal and external applications. With a 29-degree included angle and a cutting tip width of 0.0411 inches, it delivers precise thread geometry on lathes and turning centers. Machinists and toolroom technicians working in job shops, maintenance operations, and production environments install this insert in compatible Top Notch toolholders.

This insert suits applications requiring Acme thread profiles in both internal and external configurations on a single insert. The left-hand orientation makes it appropriate for reverse-helix threading operations or left-hand lead screw work. It fits standard Top Notch series toolholders sized for an insert size 3 body. Typical use cases include threading operations on steel, stainless, and similar machinable materials where a PVD-coated carbide grade is specified. The insert is sold individually but carries a minimum order quantity of 5 units per order.

Key Features

• KCU10 carbide grade with PVD-applied AlTiN finish for wear and heat resistance
• NA3L8 insert style — left-hand orientation for Acme thread forms
• 8 TPI internal pitch with a 29-degree included angle for accurate Acme geometry
• Cuts both internal and external thread forms
• Cutting tip width of 0.0411 inches (1.04 mm) for defined thread root profile
• Top Notch series construction for secure seating in compatible toolholders

Compatibility

Designed for use in Top Notch series toolholders that accept an insert size 3 threading insert. Specific holder compatibility should be verified against KENNAMETAL Top Notch toolholder documentation before installation.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician with the machine in a full stop and all power isolated before changing inserts. Seat the insert firmly in the Top Notch pocket and confirm the clamping mechanism is fully engaged before resuming operation. Inspect the insert pocket and clamping hardware for wear or debris prior to seating a new insert. Follow the toolholder manufacturer torque guidance for the clamping screw — do not overtighten.