10401915 - Tweco Classic 4 MIG Gun, 400A, 12ft, Miller Style

Product Overview

The Tweco Classic No. 4 MIG Gun (SKU: 1040-1915) is a heavy-duty, air-cooled welding torch designed for high-amperage industrial applications. Rated at 400 Amps at a 60% duty cycle using CO2 gas, this gun is engineered to withstand the rigors of structural steel fabrication, heavy equipment manufacturing, and general industrial welding. This specific configuration features a 12-foot cable assembly and a Miller-style rear connection, ensuring seamless compatibility with Miller wire feeders and power sources that utilize the standard Miller power pin.

Technical Specifications & Performance

The Classic No. 4 is built around a robust design philosophy that prioritizes longevity and field serviceability. The gun utilizes a metal-jacketed conductor tube (gooseneck) typically angled at 60 degrees, which provides excellent durability against impact and heat. The cable assembly is reinforced to resist abrasion, cuts, and burns common in shop environments. Internally, the cable design ensures consistent wire feeding and efficient current transfer, minimizing voltage drop even at higher amperages. The gun is capable of running a wide range of wire diameters, typically from .035" (0.9mm) up to 5/64" (2.0mm), depending on the liner and contact tip configuration installed.

Compatibility & Consumables

One of the primary advantages of the Tweco Classic series is its use of widely available consumables. This model typically utilizes the standard Tweco 14 Series contact tips, 24 Series gas nozzles, and 54 Series gas diffusers, making inventory management simple for procurement teams. The "MIL" designation in the product name confirms the backend connection is pre-configured for Miller equipment, eliminating the need for adapters. The "VM" code in the legacy description may refer to specific internal configuration details or liner types suited for standard steel wires. This gun represents a reliable, high-performance solution for facilities requiring consistent 400A welding capabilities.