Kennametal 4176194 Threading Insert 16 Tpi Left Hand

Product Description

The KENNAMETAL 4176194 is a carbide threading insert in the Top Notch series, designed for external thread cutting on UN-standard threads at 16 TPI. It features an AlTiN finish applied via PVD coating process, which improves wear resistance and thermal stability during threading operations. The insert is left-hand orientation with a 60-degree included angle and a corner radius of 0.0075 inches (0.19 mm). It carries insert size designation 3 and a manufacturer grade of KCU10, suited for demanding threading applications on CNC lathes and turning centers. Machinists and toolroom technicians are the primary installers of this insert type.

This insert is intended for external threading operations producing UN-standard thread forms at 16 TPI in left-hand configurations. It is typically used on CNC turning centers, manual lathes, and threading toolholders compatible with the Top Notch insert system. Common applications include production threading of fastener features, fittings, and threaded shaft ends in metalworking environments. The AlTiN PVD coating makes it suitable for dry or semi-dry cutting conditions on steels and other ferrous materials where heat resistance is a priority.

Key Features

• Carbide substrate with AlTiN PVD coating for extended wear life in threading operations
• 16 TPI external thread pitch for UN-standard thread forms
• Left-hand insert orientation for left-hand thread cutting
• 60-degree included angle matches standard UN thread geometry
• Corner radius of 0.0075 inches (0.19 mm) for precise thread root form
• Top Notch series insert style (NTC3L16E) for compatibility with Top Notch toolholding system

Compatibility

Designed for use with Top Notch series threading toolholders that accept NTC insert style, size 3. Specific toolholder compatibility should be verified against KENNAMETAL Top Notch system documentation before installation.

Installation Notes

Threading inserts of this type are installed by machinists or toolroom technicians following standard turning center lockout and toolholder torque procedures per machine builder specifications. Ensure the toolholder pocket is clean and free of chips before seating the insert. Left-hand inserts require correct spindle rotation and feed direction setup to avoid tool damage or workpiece scrap. Always verify thread pitch and insert orientation against the job drawing before cutting.