Kennametal 1113791 Threading Insert NA3L5 KC850 Carbide

Product Description

The KENNAMETAL 1113791 is a carbide threading insert in the Top Notch series, designed for cutting Acme threads in both internal and external applications. Manufactured to the NA3L5 style in a left-hand configuration, it carries the KC850 grade with a CVD-applied TiC/TiCN/TiN multilayer finish. This finish provides wear resistance and thermal stability during threading operations on ferrous and non-ferrous materials rated at material grades C5 and C6. The insert produces a 29-degree included angle at 5 threads per inch (TPI), with a tip-to-top height of 0.1492 inches and a corner radius of 0.069 inches. Machinists and toolroom operators install this insert in compatible Top Notch toolholders on CNC and manual lathes.

This insert is suited for shops and job sites producing Acme-threaded components such as lead screws, power transmission screws, and valve stems. Its left-hand orientation makes it the correct choice when thread direction requires a left-hand cut. The insert handles both internal and external thread profiles, giving it utility across a range of turning setups. It is appropriate for production environments where consistent thread form and repeatable tool life are required on medium to high-alloy steel and cast iron workpieces.

Key Features

• KC850 carbide grade with CVD TiC/TiCN/TiN multilayer finish for extended wear life
• Left-hand insert orientation for left-hand Acme thread cutting
• 5 TPI internal pitch with a 29-degree included angle matching Acme thread form
• Suitable for both internal and external thread applications in a single insert style
• Top Notch series design for positive seating and accurate indexing in compatible holders
• Insert size 3 with a tip width of 0.0689 inches and thickness of 0.1949 inches

Compatibility

Designed for use in Kennametal Top Notch series threading toolholders that accept size 3 inserts. Verify holder compatibility and thread form requirements before installation. No additional specific compatible model numbers were provided in the product data.

Installation Notes

Threading insert installation should be performed by a qualified machinist with the machine spindle stopped and all motion fully arrested before handling tooling. Use the appropriate torque wrench and insert clamp hardware specified for the Top Notch holder to secure the insert without over-tightening. Inspect the insert seat and clamp pocket for chips or debris before seating a new insert, as contamination can affect thread form accuracy. Follow the toolholder manufacturer guidelines for proper indexing and insert orientation confirmation before resuming cutting operations.