Kennametal 4176190 Threading Insert NTB4RA KCU10 Carbide

Product Description

The KENNAMETAL 4176190 is a carbide threading insert in the Top Notch series, designed for cutting American Buttress threads on CNC lathes and turning centers. It carries the KCU10 manufacturer grade and features an AlTiN finish applied via PVD coating, which provides thermal resistance and extended tool life in demanding threading operations. The insert is configured for right-hand cutting and covers an internal pitch range of 4 to 6 TPI, making it suited for both internal and external thread profiles. Insert size is 4, with a thickness of 0.2551 inches and a corner radius of 0.0100 inches. This insert seats into Top Notch-compatible toolholders and is intended for use by machinists and tooling specialists in production and job-shop environments.

This insert is used in turning and threading operations where American Buttress thread forms are required, including oil-country, piping, and heavy mechanical applications. Its right-hand orientation and 4 to 6 TPI pitch range make it applicable to both internal and external threading passes on lathes equipped with Top Notch insert toolholders. The PVD AlTiN coating supports dry or minimum-quantity lubrication cutting strategies where heat resistance is a priority.

Key Features

• KCU10 carbide grade with PVD-applied AlTiN coating for thermal and wear resistance
• American Buttress thread standard, right-hand orientation
• Internal pitch range: 4 to 6 TPI, suitable for both internal and external threads
• Corner radius of 0.0100 inches for consistent thread root geometry
• Insert size 4, thickness 0.2551 inches, fits Top Notch series toolholders
• NTB insert style for Top Notch indexable threading systems

Compatibility

Designed as a direct-fit replacement for Top Notch series indexable threading toolholders accepting NTB-style inserts. Specific compatible toolholder models were not provided in the product data; verify toolholder insert pocket specifications before ordering.

Installation Notes

Installation of indexable threading inserts should be performed by a qualified machinist with the spindle fully stopped and the machine in a locked-out, tagged-out state. Use the appropriate Top Notch torx or clamping key to seat and secure the insert according to the toolholder manufacturer torque guidelines. Inspect the insert pocket and clamping mechanism for chips or debris before seating the new insert. Confirm thread pitch and hand orientation match the programmed threading cycle before resuming operation.