1770037 - Miller MDX-250 MIG Gun 15ft AccuLock System

High-Performance Miller MDX-250 MIG Gun for Industrial Applications

The Miller MDX-250 MIG Gun (1770037) is a premium 250-amp welding gun designed to deliver reliability, comfort, and precision for professional fabricators. Engineered as a direct replacement for the legendary Miller M-25 gun, the MDX-250 integrates modern advancements in consumable technology and ergonomics to streamline welding operations. With a 15-foot cable length and a rating of 250 amps at 100% duty cycle (using CO2), this gun is built to withstand the rigors of continuous industrial use without overheating or compromising arc stability.

At the core of the MDX-250's performance is the AccuLock MDX consumable system. Unlike traditional guns that rely on set screws to hold liners in place, the AccuLock system features a front-loading liner that locks at both the front and back of the gun. This dual-locked design ensures the liner remains perfectly centered and tension-free, eliminating the common issues of birdnesting, burnbacks, and erratic wire feeding. The tapered mating surfaces between the contact tip and gas diffuser maximize electrical conductivity, resulting in a smoother arc and longer consumable life.

Compatibility is a key strength of the MDX-250. It is designed to plug directly into popular Miller power sources, including the Millermatic 212 Auto-Set, Millermatic 252, Millermatic 255, as well as the Multimatic 200 and 255 series. The gun comes ready to feed .030 to .035-inch wire right out of the box, making it an immediate upgrade for shops looking to improve their welding efficiency. The robust cable construction features increased copper content, ensuring consistent current delivery even during pulse welding applications.

Key Technical Specifications

• Amperage Rating: 250 A
• Duty Cycle: 100% with CO2, 60% with Mixed Gas
• Cable Length: 15 ft (4.6 m)
• Wire Capacity: .030" - .035" (0.8 - 0.9 mm) standard
• Cooling: Air Cooled
• Connector Type: Miller Style