Kennametal 4033882 Turning Insert NTU4R KCU25 Carbide

Product Description

The KENNAMETAL 4033882 is a carbide turning insert designed for external threading operations on CNC lathes and turning centers. It carries the NTU4R insert style with a KCU25 grade and an AlTiN PVD coating that resists heat and wear during high-speed threading passes. The insert follows a partial profile 60-degree thread standard, making it suitable for cutting threads in the 1.25 to 6.25 mm pitch range (4 to 20 TPI). Right-hand cutting geometry and the Top Notch series mounting system allow secure, repeatable seating in compatible toolholders. Machinists and CNC programmers working in job shops or production turning environments install this insert as part of a qualified threading toolholder assembly.

This insert is used in external threading applications on turned workpieces where a 60-degree partial profile form is required. The Top Notch series is a common indexable threading platform found in production and job-shop lathes. The 4 to 20 TPI range covers a wide variety of standard fastener and mechanical thread forms, making this insert a practical choice for shops running mixed threading work on steel and other machinable alloys. The KCU25 carbide grade paired with PVD AlTiN coating supports interrupted cuts and variable-material threading runs.

Key Features

• KCU25 carbide grade with PVD-applied AlTiN coating for extended tool life in external threading
• Partial profile 60-degree thread standard covering 1.25 to 6.25 mm pitch and 4 to 20 TPI
• NTU4R right-hand insert style for use in Top Notch series indexable toolholders
• 0.11 mm (0.0045 inch) corner radius for accurate thread root geometry
• Insert thickness of 6.35 mm (0.25 inches) for rigid seating in the pocket
• Single insert per package with a minimum order quantity of 5 units

Compatibility

Designed for use in Top Notch series indexable threading toolholders that accept the NTU insert style. Verify toolholder pocket specifications before installation to confirm proper fit and clamping.

Installation Notes

This insert is installed by a qualified machinist or CNC setup technician. Power down and lock out the machine spindle before indexing or replacing inserts. Use the correct torque wrench and clamping screw specified by the toolholder manufacturer — do not overtighten, as this can crack the insert. Confirm insert seating and thread form with a thread gauge before running production parts.