Kennametal 4109942 Threading Insert NT3L KCU25 Carbide

Product Description

The KENNAMETAL 4109942 is a carbide threading insert in the Top Notch series, designed for precision thread-cutting on both internal and external workpieces. It carries a KCU25 manufacturer grade with an AlTiN finish applied via PVD coating, which extends wear life in demanding cutting conditions. The insert runs a left-hand orientation and covers a partial profile 60-degree thread standard. External pitch range spans 1.25 to 4.00 mm (6 to 20 TPI), and internal pitch range spans 2.00 to 5.00 mm (5 to 12 TPI). Machinists and toolroom operators install this insert into compatible Top Notch toolholders on CNC lathes and threading centers.

This insert is suited for threading operations on a variety of materials where AlTiN PVD coating provides thermal resistance and surface hardness. The left-hand designation makes it appropriate for left-hand thread applications or specific machine orientations requiring reverse-cut tooling. It is used in both production and job-shop environments on CNC turning equipment. The NT3L insert style fits Top Notch series toolholders sized for Insert Size 3. Internal and external thread capability in a single insert reduces tooling changeovers on multi-thread jobs.

Key Features

• Carbide substrate with AlTiN finish via PVD coating for extended tool life
• Partial profile 60-degree thread standard covers a wide TPI and pitch range
• Left-hand insert orientation for reverse-cut and left-hand thread applications
• External pitch: 1.25 to 4.00 mm (6 to 20 TPI); Internal pitch: 2.00 to 5.00 mm (5 to 12 TPI)
• NT3L style fits Top Notch series toolholders, Insert Size 3
• Included angle of 60 degrees, corner radius 0.17 mm (0.0067 inches)

Compatibility

Designed for use with Top Notch series toolholders accepting NT Insert Style, Insert Size 3, left-hand configuration, as specified by the manufacturer for this product series.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the machine spindle before seating or removing the insert. Use the correct torque wrench and manufacturer-specified clamping hardware for Top Notch toolholders to ensure proper insert retention without over-stress. Inspect the insert pocket for chips or damage before installation, and verify insert orientation matches the required thread hand before resuming cutting.