Kennametal 1796553 Threading Insert 8 Tpi NJ3020R8 KC5025

Product Description

The KENNAMETAL 1796553 is a carbide threading insert designed for external thread cutting on CNC lathes and turning centers. It carries the NJ3020R8 insert designation and is manufactured to the KC5025 grade, a PVD-coated carbide grade with a TiAlN finish engineered for wear resistance and thermal stability in interrupted and continuous threading applications. The insert produces UNJ-standard external threads at 8 threads per inch (TPI) with a 60-degree included angle. It runs in the Top Notch insert style system, right-hand orientation. The corner radius measures 0.0193 inches (0.49 mm), and the tip-to-top-of-insert height is 0.0980 inches (2.49 mm). This insert is specified and installed by CNC machinists and toolroom technicians working in aerospace, defense, and general precision machining environments.

This insert is suited for external UNJ thread forms on materials falling in the C2 and C6 material grade classifications, which correspond to non-ferrous metals, cast irons, and certain steels. The UNJ thread standard is commonly specified in aerospace fastener and hydraulic fitting applications where controlled root radius is required for fatigue resistance. The Top Notch insert system is a quick-change threading platform that accepts this NJ-style insert in compatible Kennametal Top Notch holders. The right-hand configuration is appropriate for conventional external threading passes on standard CNC turning equipment.

Key Features

• KC5025 PVD carbide grade with TiAlN finish for extended tool life in external threading
• 8 TPI pitch for UNJ external thread forms with a 60-degree included angle
• Corner radius of 0.0193 inches (0.49 mm) consistent with UNJ controlled root radius requirements
• Top Notch NJ insert style for use in compatible Kennametal Top Notch threading toolholders
• Right-hand cut orientation for standard external threading direction
• Insert size 3020 with a thickness of 0.1949 inches (4.95 mm)

Compatibility

Designed for use in Kennametal Top Notch series threading toolholders that accept NJ-style inserts. Verify holder acceptance of the NJ3020 insert size before installation. No additional specific compatible model numbers were provided in available product data.

Installation Notes

Installation is performed by a qualified CNC machinist or toolroom technician. Power down and lock out the machine before seating or removing the insert. Ensure the toolholder pocket and clamping surfaces are clean and free of chips before seating the insert, as debris under the insert will affect thread form accuracy and can fracture the cutting edge. Torque the clamp screw to the toolholder manufacturer specification found in the holder documentation - do not estimate clamp torque. Verify insert orientation and thread hand before taking the first pass.