Kennametal 1799449 Threading Insert Acme 4 Tpi Left Hand

Product Description

The KENNAMETAL 1799449 is a carbide threading insert designed for cutting Acme thread profiles on both internal and external applications. It features a TiAlN finish applied via PVD coating process, which provides hard surface protection and wear resistance during threading operations. The insert carries the NA4L4 designation, indicating left-hand cut with a 4 TPI internal pitch and a 29-degree included angle. It belongs to the Top Notch series and is manufactured to KC5025 grade, a coated carbide grade suited for threading in steel and cast iron. A licensed machinist or toolroom technician installs this insert into compatible Top Notch threading toolholders on CNC lathes or manual turning equipment.

This insert is intended for Acme thread cutting in metalworking environments, including job shops and production floors. The left-hand configuration is specified for applications that require reverse-thread cutting. It handles both internal and external Acme profiles within the same insert style. The 4 TPI pitch makes it appropriate for larger-diameter Acme lead screw and power screw work common in industrial machinery, fixtures, and actuator components. Material grades C2 and C6 indicate suitability for a range of ferrous and non-ferrous workpiece materials.

Key Features

• TiAlN finish via PVD coating for extended wear life in threading applications
• Left-hand cut geometry for reverse-thread Acme profiles
• Covers both internal and external thread cutting in one insert style
• 4 TPI pitch with 29-degree included angle matches standard Acme thread form
• KC5025 carbide grade rated for C2 and C6 material classifications
• Top Notch series for indexed fit in compatible Kennametal Top Notch toolholders

Compatibility

Designed for use in Kennametal Top Notch series threading toolholders accepting size 4 inserts. Verify toolholder compatibility with the NA4L4 insert style before ordering.

Installation Notes

Installation is performed by a qualified machinist or CNC toolroom technician. Power down and lock out the machine spindle before indexing or replacing inserts. Seat the insert fully in the toolholder pocket and tighten the clamping screw according to the toolholder manufacturer specifications. Inspect the cutting tip and coating condition before each use; do not use chipped or damaged inserts.