Kennametal 1690876 Threading Insert Iso External KC5025

Product Description

The KENNAMETAL 1690876 is a solid carbide laydown threading insert designed for external ISO thread-turning operations on CNC lathes and turning centers. Offered in the KC5025 grade with a PVD-applied TiAlN coating, this insert delivers wear resistance and thermal stability in a range of ferrous and hardened work materials. It features a right-hand cutting configuration and a CB chipbreaker geometry suited for threading at a 1.00 mm pitch. The 3/8-inch (9.53 mm) inscribed circle and 0.1430-inch thickness conform to standard LT16 toolholder pockets. Licensed machinists and CNC operators install this insert as a direct pocket replacement during routine tooling changes.

This insert is intended for external ISO-standard threading applications on turning and mill-turn equipment. The LT16ER10ISO designation identifies the insert style, thread standard, and pitch, making it a straightforward selection for shops threading metric ISO profiles on shafts, fasteners, and hydraulic fittings. The KC5025 grade is suited for interrupted and continuous thread passes in steel and cast iron. The TiAlN PVD coating supports dry and semi-dry cutting conditions where coolant use is limited or undesirable.

Key Features

• Solid carbide substrate in KENNAMETAL KC5025 grade for threading in ferrous materials
• PVD TiAlN coating for elevated wear resistance and thermal hardness at the cutting edge
• Right-hand external ISO threading geometry at 1.00 mm pitch
• CB chipbreaker for controlled chip formation during thread-turning passes
• 3/8-inch (9.53 mm) inscribed circle fits standard LT16 toolholder pockets
• 0.1430-inch (3.44 mm) thickness for proper seating and repeatable insert indexing

Compatibility

Designed for use in LT16 style laydown threading toolholders accepting a 3/8-inch inscribed circle insert with a 0.1551-inch mounting hole diameter. Verify toolholder pocket geometry and insert style designation before installation.

Installation Notes

Insert installation and indexing should be performed by a qualified CNC machinist or tooling technician. Power down and lock out the machine spindle before removing or seating any insert. Use the correct torque wrench and insert screw specified by the toolholder manufacturer - do not overtighten or use substitute fasteners. Confirm insert seating and edge orientation before resuming any cutting operation.