Kennametal 2393668 Carbide Thread Mill Insert Un 20 Tpi

Product Description

The KENNAMETAL 2393668 is a carbide thread mill insert designed for external UN thread milling operations. Manufactured from solid carbide with a PVD-applied TiAlN finish, this insert delivers wear resistance and thermal stability in demanding threading applications. It carries the KC635M manufacturer grade designation, which is suited for thread milling in a range of workpiece materials. At 20 teeth per inch and an inscribed circle of 3/8 inch (9.53 mm), the insert is sized for precise thread geometry on external profiles. Machinists and tooling specialists install this insert into compatible thread mill toolholders as part of CNC milling operations.

This insert is intended for external UN thread milling in machining center environments. The UN thread standard covers a broad range of unified inch fastener thread profiles used throughout industrial and mechanical assembly applications. With 20 TPI, the insert targets finer-pitch unified thread forms. It is typically used in job shop, production machining, and MRO environments where repeatable thread quality is required. The STN insert style indicates the specific seating and clamping geometry required by the compatible toolholder body.

Key Features

• Carbide substrate provides rigidity and wear resistance for thread milling applications
• TiAlN coating applied via PVD process for thermal protection and extended tool life
• KC635M grade designation optimized for thread milling cutting conditions
• 20 TPI configuration for external UN thread profiles
• 3/8 inch (9.53 mm) inscribed circle for consistent insert-to-holder fit
• STN insert style geometry for use with compatible Kennametal thread mill bodies

Compatibility

Designed for use with compatible STN-style thread mill toolholder bodies requiring a 3/8 inch inscribed circle insert for external UN thread milling at 20 TPI. No specific compatible model numbers were provided in the product data.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. The machine spindle must be stopped and the tool assembly fully secured before inserting or replacing inserts. Use the correct torx or hex key to the toolholder manufacturer's seating procedure to ensure proper clamping without over-torquing the insert screw. Verify insert orientation and seating before resuming machining operations.