Kennametal 4175986 Threading Insert NTK3L KCU10 Carbide

Product Description

The KENNAMETAL 4175986 is a carbide threading insert designed for both internal and external thread cutting operations. Running the NTK3L insert style in the KCU10 grade with a PVD-applied AlTiN finish, this insert handles partial profile 60-degree thread forms on a left-hand cutting orientation. External pitch range covers 0.60 to 2.50 mm and 10 to 44 TPI. Internal pitch range covers 1.00 to 2.50 mm and 9 to 24 TPI. It belongs to the Top Notch series and is sized as an Insert Size 3. Machinists and CNC operators use this insert on lathes and turning centers for precision threading of ferrous and hard materials where AlTiN coating improves heat and wear resistance.

This insert is suited for threading applications in manufacturing, production machining, and maintenance environments. It applies to both internal threading operations such as tapped bores and external threading operations such as fastener profiles and threaded shafts. The 60-degree included angle covers the most common unified and metric thread forms. Left-hand orientation makes it appropriate for left-hand thread production or specific toolholder configurations that require LH inserts within the Top Notch tooling system.

Key Features

• Carbide substrate with PVD AlTiN finish for elevated heat resistance and extended tool life
• Covers external pitch range of 0.60 to 2.50 mm and 10 to 44 TPI
• Covers internal pitch range of 1.00 to 2.50 mm and 9 to 24 TPI
• Partial profile 60-degree thread form suits the widest range of unified and metric thread standards
• Left-hand insert style NTK3L for use with compatible left-hand Top Notch toolholders
• Corner radius of 0.08 mm (0.0031 inches) for precise thread root geometry

Compatibility

Designed for use with compatible KENNAMETAL Top Notch series toolholders that accept Insert Size 3 left-hand threading inserts.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Ensure the machine spindle is fully stopped and the turret is in a safe indexed position before seating or removing the insert. Use the correct Top Notch clamp and torque the clamp screw per the toolholder manufacturer specification. Verify insert seating and clearance before resuming cutting operations.