Kennametal 1112921 Threading Insert 20 Tpi Carbide KC730

Product Description

The KENNAMETAL 1112921 is a carbide threading insert designed for external thread cutting applications. Carrying the NJF3008R20 designation within the Top Notch series, this insert is engineered for right-hand external threading at 20 TPI on UNJ thread forms. The substrate is carbide grade KC730, finished with a Titanium Nitride (TiN) coating applied via a PVD process. TiN coating improves surface hardness and wear resistance, extending tool life in production threading operations. With a 60-degree included angle, a corner radius of 0.0078 inches, and a tip-to-top height of 0.1409 inches, this insert delivers consistent thread geometry on precision external profiles. Machinists and CNC operators working on aerospace or precision-component threading will find this insert suited to demanding cycle requirements.

This insert is intended for external threading on materials classified under grades C2, C3, and C4, which include medium-to-hard steels, alloy steels, and similar machinable metals. It seats in compatible Top Notch series holders designed to accept NJF-style inserts. Typical applications include threading on turned components in precision machining environments such as aerospace, hydraulic, and defense part manufacturing where UNJ thread forms are specified. This is a single-piece package item sold in a minimum order quantity of 5 units.

Key Features

• Carbide substrate with KC730 manufacturer grade for wear resistance in steel-cutting operations
• PVD-applied Titanium Nitride (TiN) finish for improved surface hardness and tool life
• 20 TPI external UNJ thread form with 60-degree included angle
• Right-hand cut orientation; NJF insert style in the Top Notch series
• Corner radius of 0.0078 inches (0.2 mm) for controlled thread root geometry
• Insert size 3008; compact profile suitable for close-clearance tooling setups

Compatibility

Designed for use in Top Notch series threading toolholders that accept NJF-style inserts. Compatible with material grades C2, C3, and C4 workpiece materials as specified for this insert designation.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and the toolholder is secured before seating or changing the insert. Use the appropriate torx or hex key as specified by the toolholder manufacturer to clamp the insert to the correct clamping torque per holder documentation. Inspect the insert pocket and clamping hardware for wear or debris before seating a new insert to ensure proper alignment and thread accuracy.