Kennametal 4033834 Threading Insert Acme 2.5 Tpi Left Hand

Product Description

The KENNAMETAL 4033834 is a carbide threading insert designed for cutting Acme thread forms on both internal and external workpieces. Part of the Top Notch series, it carries a KCU25 manufacturer grade and an AlTiN finish applied via PVD coating. The left-hand configuration makes it suited for left-hand thread applications where standard right-hand inserts cannot be used. With a cutting tip width of 0.1802 inches and a 29-degree included angle, this insert produces accurate Acme thread profiles at 2.5 TPI. Licensed machinists and CNC lathe operators working in general machining, repair shops, and production environments are the primary users.

This insert is used in threading operations requiring Acme thread standards, including lead screw production, power transmission components, and linear actuator shafts. The left-hand orientation is specifically suited for applications where thread direction must oppose standard convention. The Top Notch series is a common platform in CNC turning and manual lathe setups. Both internal threading on bores and external threading on shafts are within its designed scope at the 2.5 TPI pitch rating.

Key Features

• Acme thread standard with a 29-degree included angle for accurate thread form geometry
• KCU25 carbide grade with AlTiN finish via PVD coating for wear resistance and surface hardness
• Left-hand insert orientation for left-hand thread cutting applications
• Handles both internal and external threading operations at 2.5 TPI
• Cutting tip width of 0.1802 inches with a 0.0050-inch corner radius for defined thread crests
• Insert size 6, Top Notch series platform for compatibility with corresponding toolholders

Compatibility

Designed for use with Top Notch series threading toolholders that accept size 6 inserts. Confirm toolholder hand orientation matches the left-hand configuration of this insert before installation.

Installation Notes

Installation should be performed by a qualified machinist following standard CNC or manual lathe tooling procedures. Ensure the machine spindle is fully stopped and the turret or tool post is de-energized before seating or replacing the insert. Use the appropriate torx or clamp screw driver specified for the Top Notch toolholder to secure the insert without over-torquing the clamping mechanism. Verify thread pitch, hand orientation, and insert seating before taking a test pass.