Kennametal 1112993 Threading Insert NAS3L8 KC730 Carbide

Product Description

The KENNAMETAL 1112993 is a carbide threading insert designed for precise thread-cutting operations on CNC lathes and manual turning centers. Part of the Top Notch series, it features a Titanium Nitride (TiN) finish applied via PVD coating, which extends cutting edge life and reduces friction during threading passes. The insert is configured for left-hand cutting and is sized for Stub Acme thread forms at 8 TPI with a 29-degree included angle. Material grades C2, C3, and C4 make it suitable for threading a range of workpiece materials. Machinists and CNC operators in production and job-shop environments install this insert into compatible Top Notch threading toolholders.

This insert handles both internal and external Stub Acme threading to the NAS3L8 standard. Its left-hand orientation suits applications where thread direction or machine setup requires a left-hand cut. The 8 TPI pitch and 29-degree angle are characteristic of Stub Acme forms commonly found in power transmission components, lead screws, and linear actuator hardware. The KC730 grade and PVD TiN coating combination supports threading in steel, cast iron, and other materials within the C2 through C4 material grade range. Insert Size 3 designates the physical form factor within the Top Notch system.

Key Features

• Stub Acme thread form at 8 TPI with 29-degree included angle for left-hand internal and external threading
• KC730 carbide grade with PVD Titanium Nitride coating for extended tool life
• NAS3L8 insert style compatible with Top Notch series toolholders
• Material grades C2, C3, and C4 cover a broad range of workpiece materials
• Corner radius of 0.0480 inches and cutting tip width of 0.0476 inches for controlled thread geometry
• Insert Size 3 form factor within the Top Notch platform

Compatibility

Designed for use with KENNAMETAL Top Notch series threading toolholders that accept NAS3L8 style inserts. Verify toolholder insert style and seat geometry before installation.

Installation Notes

Threading inserts should be installed and changed by qualified machinists or CNC operators with the machine powered down and spindle locked. Use the correct torque driver or clamp screw specified for the Top Notch toolholder to seat the insert properly. Inspect the insert seat and clamp for debris or wear before seating a new insert. Do not mix insert styles or sizes within a toolholder seat.