Kennametal 1182188 Threading Insert 28 Tpi Carbide KC730

Product Description

The KENNAMETAL 1182188 is a carbide threading insert in the Top Notch series, designed for external thread turning on CNC lathes and screw machines. It carries the NTC3R28E designation, indicating a right-hand, external-thread geometry ground to cut 28 threads per inch (TPI) on UN-standard thread forms. The insert is manufactured from a C2/C3/C4 carbide substrate and finished with a PVD-applied Titanium Nitride (TiN) coating in the KC730 grade. KC730 is optimized for threading operations where edge sharpness and wear resistance are both critical. Insert size is 3, with a thickness of 0.1949 inches and a tip-to-top measurement of 0.1480 inches.

This insert is suited for external threading of UN-standard fastener threads at 28 TPI, a pitch common in fine-thread inch-series applications across aerospace, hydraulic, and precision mechanical assemblies. It is installed in compatible Top Notch series toolholders used in production turning centers and manual lathes. The right-hand designation applies to standard forward-cutting setups. Machinists and toolroom technicians working in job shop or production environments will find this insert appropriate for ferrous and non-ferrous threading where PVD TiN coating extends tool life over uncoated alternatives.

Key Features

• 28 TPI external thread form ground to UN standard with a 60-degree included angle
• KC730 carbide grade with PVD Titanium Nitride coating for improved wear resistance
• Corner radius of 0.0046 inches (0.12 mm) for precise thread root geometry
• Insert size 3 Top Notch series for use in compatible Kennametal toolholders
• Right-hand cutting orientation for standard lathe thread-turning setups
• Lightweight at 0.032 pounds, minimizing toolholder load in multi-insert setups

Compatibility

Designed for use in Top Notch series threading toolholders that accept size 3 NTC-style inserts. Consult toolholder documentation to confirm insert pocket geometry before installation.

Installation Notes

Threading inserts of this type are installed and changed by qualified machinists or toolroom technicians. Power down and lock out the machine spindle before seating or removing any insert. Use the correct Torx or hex key for the clamping screw as specified by the toolholder manufacturer — do not over-tighten or use impact tools on insert clamp screws. Verify thread pitch and hand on the first pass before committing to a full threading cycle.