Kennametal 1112985 Threading Insert NAS3R6 KC730 Carbide

Product Description

The KENNAMETAL 1112985 is a carbide threading insert designed for precision thread-cutting operations on metalworking lathes and CNC turning centers. Part of the Top Notch series, this NAS-style insert features a KC730 grade carbide substrate with a PVD-applied Titanium Nitride (TiN) finish that extends cutting edge life in interrupted and continuous threading passes. It is configured for 6 TPI Stub Acme thread forms at a 29-degree included angle and handles both internal and external thread applications in a right-hand orientation. Machinists and CNC operators working on Stub Acme threaded components install this insert as a direct toolholder drop-in within the Top Notch system.

This insert is suited for threading operations on ferrous and non-ferrous workpiece materials falling within material grades C2, C3, and C4. Typical applications include producing Stub Acme threads on lead screws, power transmission components, and actuator shafts in both production and job-shop environments. The right-hand cutting geometry makes it the standard choice for conventional lathe setups running standard spindle direction. It is compatible with both internal bore threading bars and external threading toolholders that accept the Top Notch insert system.

Key Features

• KC730 carbide grade with PVD Titanium Nitride coating for extended tool life
• NAS insert style sized at Insert Size 3 for Top Notch series toolholders
• 6 TPI Stub Acme thread form with 29-degree included angle for accurate thread profiles
• Right-hand cutting configuration for standard lathe and CNC turning setups
• Handles both internal and external threading applications in a single insert style
• Corner radius of 0.065 inches supports consistent thread root geometry

Compatibility

Designed as an OEM-style replacement insert for Top Notch series threading toolholders accepting NAS-style Size 3 inserts. Compatible with material grades C2, C3, and C4 workpiece classifications.

Installation Notes

Installation is performed by qualified machinists or CNC operators following standard insert-change procedures for Top Notch series toolholders. Power down and lock out the machine spindle before seating or removing the insert. Ensure the insert pocket and clamping components are free of chips and debris before installation, as contamination affects seating accuracy and thread quality. Follow the toolholder manufacturer torque guidance for the clamping screw; do not over-tighten.