Kennametal 1679776 Threading Insert Iso Internal Rh

Product Description

The KENNAMETAL 1679776 is a laydown threading insert designed for right hand internal ISO thread cutting operations on CNC lathes and turning centers. Manufactured from solid carbide in grade KC5025 with a PVD-applied TiAlN coating, this insert delivers consistent tool life and dimensional accuracy when threading internal bores to ISO standards. The 1.00 mm pitch designation makes it suited for fine metric threading applications. With a 1/4 inch inscribed circle and 3.04 mm (0.1260 inch) thickness, the 1679776 seats into compatible 11NR-style toolholders. Machinists and CNC operators in job shops and production environments install this insert as a direct replacement or production consumable.

This insert is used in internal threading operations on ferrous and non-ferrous workpieces where ISO metric thread forms are required. The CB chipbreaker geometry promotes chip control in through-bore and blind-bore threading. Typical applications include threading hydraulic fittings, threaded bushings, and precision bores in production machining environments. The TiAlN coating supports elevated cutting temperatures, extending tool life in interrupted cuts and moderate to high cutting speed ranges.

Key Features

• Solid carbide substrate in manufacturer grade KC5025 for thermal resistance and edge stability
• PVD TiAlN coating for extended tool life at elevated cutting temperatures
• Right hand cutting geometry for standard internal ISO thread direction
• CB chipbreaker for reliable chip control in internal bore threading
• 1.00 mm pitch for fine metric ISO thread cutting
• 11NR insert style seats in standard 11NR-compatible toolholders

Compatibility

Designed for use in 11NR-style internal threading toolholders that accept a 1/4 inch inscribed circle laydown insert with a 3.25 mm hole diameter. Verify toolholder manufacturer specifications for insert seating and clamping compatibility before installation.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Ensure the machine spindle is fully stopped and the toolholder is secured in the turret before seating or removing inserts. Use the correct torque wrench and clamping hardware specified by the toolholder manufacturer - do not overtighten the clamp screw, as carbide inserts are brittle and can fracture under excess clamping force. Inspect the insert pocket for debris or damage before seating a new insert to ensure proper contact and accurate thread geometry.