Kennametal 4176186 Threading Insert NTB3LB KCU10 Carbide

Product Description

The KENNAMETAL 4176186 is a carbide threading insert in the Top Notch series, designed for cutting American Buttress threads on both internal and external workpieces. It carries a KCU10 manufacturer grade and an AlTiN finish applied via PVD coating, which provides hard surface protection suited to demanding threading operations. The insert is left-hand orientation, covers a pitch range of 8 to 16 TPI, and features a corner radius of 0.0065 inches (0.17 mm) with an overall thickness of 0.1949 inches (4.95 mm). Machinists and toolroom professionals use this insert in compatible Top Notch toolholders on CNC lathes and manual turning equipment.

This insert is used in production and job-shop environments where American Buttress thread profiles are required on parts such as pipe fittings, actuator stems, and heavy mechanical assemblies. The left-hand cutting geometry makes it suitable for workpieces that require reverse-direction threading. It handles both internal and external thread applications, giving shops a single insert style for varied Buttress threading work. Sold individually per package with a minimum order quantity of 5 units.

Key Features

• KCU10 carbide grade with PVD-applied AlTiN coating for wear resistance
• American Buttress thread standard, internal and external capability
• Left-hand insert orientation
• Pitch range: 8-16 TPI
• Corner radius: 0.0065 inches (0.17 mm) for precise thread form
• Top Notch series insert style NTB, Insert Size 3

Compatibility

Designed for use with compatible Kennametal Top Notch series threading toolholders that accept NTB style, size 3 inserts. Confirm toolholder acceptance of left-hand geometry before installation.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Ensure the machine spindle is fully stopped and the toolholder is secure before seating or replacing the insert. Use the correct torque wrench and insert screw per the toolholder manufacturer specification to avoid cracking the carbide. Inspect the insert pocket for chips or debris before seating to ensure proper insert contact and thread form accuracy.