Vargus 51252 Threading Insert 12 Tpi Acme 3G Solid Carbide

Product Description

The VARGUS 51252 is a solid carbide laydown threading insert designed for cutting external Acme 3G threads on CNC lathes and threading machines. Running at 12 threads per inch (TPI) with a 29-degree included angle, this insert meets ANSI B1.5:1988 requirements for standard Acme thread profiles. It carries a TiN coating applied via PVD process, which improves surface hardness and extends edge life across a wide range of workpiece materials. The 3ER insert style seats in standard laydown toolholders and is sized with a 3/8-inch (9.53 mm) inscribed circle and a thickness of 3.6 mm. Installation is right-hand orientation for external threading operations.

This insert is suited for general-purpose external threading on turning centers in both production and job-shop environments. Its universal material code covers steel, stainless, cast iron, non-ferrous alloys, and heat-resistant superalloys, making it a versatile choice when threading a variety of workpiece materials. It is well matched to applications where Acme thread forms are required, such as lead screws, linear actuators, and power transmission components. Machinists and CNC operators working to ANSI Acme 3G tolerances will find this insert fits standard laydown threading toolholder systems without modification.

Key Features

• Solid carbide substrate with PVD-applied TiN coating for extended tool life
• 12 TPI Acme 3G thread profile conforming to ANSI B1.5:1988
• 29-degree included angle matches standard Acme thread geometry
• 3ER insert style with 3/8-inch inscribed circle fits common laydown holders
• Right-hand external cutting orientation
• Universal workpiece material compatibility including steel, stainless, cast iron, non-ferrous, and superalloys

Compatibility

Designed as an OEM-style laydown threading insert for standard 3ER-style toolholders used in external Acme thread turning applications.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Power down and lock out the machine before changing inserts. Seat the insert fully in the toolholder pocket and torque the clamping screw to the toolholder manufacturer specification. Verify thread profile and pitch with a thread gauge before running production parts.