Kennametal 1112937 Threading Insert NA3R8 KC730 Carbide

Product Description

The KENNAMETAL 1112937 is a carbide threading insert designed for cutting Acme thread profiles at 8 threads per inch (TPI). Part of the Top Notch series, it features a titanium nitride (TiN) finish applied via PVD coating process, which improves surface hardness and wear resistance during threading operations. The insert carries an NA style designation and is sized as an Insert Size 3, with a tip-to-top height of 0.1492 inches and a thickness of 0.1949 inches. It is suited for both internal and external thread cutting and is installed by machinists and CNC operators in production and job-shop environments.

This insert is designed for Acme thread applications at 8 TPI, handling both internal and external threading passes. The right-hand configuration makes it compatible with standard right-hand threading setups on lathes and CNC turning centers. Material grade ratings of C2, C3, and C4 indicate suitability for cutting a range of work materials including cast iron, non-ferrous metals, and heat-resistant alloys. The KC730 grade with PVD TiN coating provides consistent performance across moderate to high cutting speeds in production threading scenarios.

Key Features

• Carbide construction with PVD-applied titanium nitride (TiN) finish for extended tool life
• Acme thread standard, 8 TPI, with a 29-degree included angle
• Right-hand insert orientation for standard threading setups
• Supports both internal and external thread cutting
• Insert Size 3, tip-to-top height of 0.1492 inches, thickness of 0.1949 inches
• Part of the Top Notch series for use with compatible Top Notch toolholders

Compatibility

Designed for use with Top Notch series toolholders compatible with Insert Size 3 seats. Suitable for Acme thread profiles at 8 TPI in right-hand internal and external threading applications.

Installation Notes

Threading inserts should be installed by qualified machinists following the toolholder manufacturer's seating and clamping procedures. Power down and lock out the machine before changing inserts. Ensure the insert is fully seated in the pocket before clamping, and verify clearance angles and thread pitch setup against the workpiece specification before initiating a cut. Handle carbide inserts with care to avoid chipping the cutting edge.