Vargus 80721 Carbide Thread Mill Insert Un 12 Tpi

Product Description

The VARGUS 80721 is a carbide thread mill insert designed for internal thread milling applications on UN unified national thread forms. The insert carries a TiCN (titanium carbonitride) coating applied via PVD process, which improves surface hardness and wear resistance compared to uncoated carbide. Manufactured to the VBX grade specification and conforming to ANSI B1.1:74, this insert is suited for machining steel and ferrous workpiece materials at 12 threads per inch. Machinists and toolroom technicians install this insert into compatible R40I-style thread mill bodies as a replacement cutting element.

This insert is intended for internal thread milling operations where a UN thread form is required at 12 TPI. Typical applications include production machining and job shop work on ferrous materials classified under the P workpiece material group, which covers carbon steels, alloy steels, and cast steels. The 12 TPI pitch and UN profile make this insert appropriate for a range of standard fastener thread sizes used across general mechanical and industrial applications. It is sold individually as a single insert.

Key Features

• Carbide substrate with TiCN PVD coating for extended tool life on ferrous materials
• Internal thread milling geometry for UN unified national thread form
• 12 TPI pitch conforms to ANSI B1.1:74 standard
• Insert style R40I, size code 40 for compatibility with matching tool bodies
• VBX manufacturer grade designation for consistent quality control
• P-group workpiece material rating covering carbon and alloy steels

Compatibility

Designed as a replacement insert for R40I-style thread mill tool bodies requiring a size 40 insert. Confirm holder compatibility with the R40I insert style and size code 40 before ordering.

Installation Notes

Inserts of this type are installed by qualified machinists or toolroom technicians using the appropriate torx or hex key specified by the tool body manufacturer. Ensure the machine spindle is fully stopped and locked out before changing inserts. Seat the insert fully against the pocket locating surfaces and verify there is no movement before resuming cutting operations. Follow the tool body manufacturer torque guidance for the clamping screw to avoid insert damage or poor seating.