Q4025MF3ESC - Bernard BTB 400A MIG Gun, 25ft Cable, Tweco Connection, 0.045 Wire

Heavy-Duty Bernard BTB 400 Amp MIG Gun

The Bernard BTB (Best of the Best) 400 Amp MIG Gun, SKU Q4025MF3ESC, is engineered for the most demanding industrial environments. Designed to deliver reliable performance in high-amperage applications, this air-cooled gun is rated for 400 amps at 100% duty cycle when using CO2 shielding gas. This ensures that the tool can withstand continuous welding operations without overheating, making it an ideal choice for heavy fabrication, structural steel, and manufacturing sectors.

One of the standout features of this configuration is its 25-foot cable length. While standard guns often come in 15-foot lengths, the extra reach provided by this model allows welders to access joints on large weldments, trailers, or heavy machinery without constantly repositioning the wire feeder or power source. This increases efficiency and reduces downtime on the shop floor. The gun comes pre-configured for 0.045-inch wire, a common diameter for structural and heavy-plate welding.

Connectivity is seamless with the integrated Tweco-style rear connection. This industry-standard backend ensures compatibility with a wide range of wire feeders from major manufacturers that utilize Tweco receptacles. The gun utilizes Bernard's renowned Centerfire consumable system, which features a threadless contact tip design that drops into the diffuser and is locked in place by the nozzle. This design promotes better conductivity and smoother gas flow, resulting in higher quality welds and less troubleshooting.

Key Industrial Benefits:

• High Duty Cycle: 100% at 400A (CO2) for continuous operation.


• Extended Reach: 25ft cable minimizes equipment movement.


• Robust Consumables: Centerfire system reduces burn-back and downtime.


• Universal Fit: Tweco backend fits most industrial feeders.