Xtrweld 420-3545M Mig Gun 400A 20ft Miller Rear .045in

Product Description

The XTRWELD 420-3545M is a heavy-duty MIG welding gun designed for professional welding applications requiring sustained high-amperage output. Rated at 400 amps, this gun accommodates wire sizes up to .045 inches and features a Miller-style rear power pin for direct connection to compatible Miller welding machines. At 20 feet in length, it gives welders the reach needed for larger workpieces and production environments without sacrificing control. The gun uses Tweco-style consumables and liner, making replacement parts widely available through most welding supply distributors. It is suited for professional welders, fabrication shops, and maintenance technicians working with MIG processes on steel and other weldable metals.

This MIG gun is intended for use in professional and light industrial welding settings where a Miller-backend machine interface is required. The 20-foot cable length suits both fixed welding stations and semi-portable setups where the operator needs distance from the wire feeder. The Tweco-compatible consumable system means nozzles, contact tips, and liners can be sourced independently, reducing downtime during consumable changes. This gun is appropriate for structural tack work, fabrication, and production welding where consistent 400-amp duty is needed.

Key Features

• 400-amp output rating supports heavy MIG welding applications
• Miller-style rear power pin for direct compatibility with Miller wire feeders and welders
• Accepts wire sizes up to .045 inches for a range of wire and material combinations
• 20-foot cable length provides extended reach from the wire feeder
• Tweco-compatible consumables and liner for easy, widely available part replacement

Compatibility

Designed for use with Miller-backend welding machines. Compatible with Tweco-style consumables and liners. Accepts wire up to .045 inches in diameter.

Installation Notes

Installation should be performed by a qualified welder or welding technician. Before connecting or disconnecting the gun, power down the welding machine and ensure the wire feeder is disabled. Verify that the power pin style on the machine matches the Miller rear-style connection before installation. Follow the welding machine manufacturer's guidelines and applicable workplace safety codes when setting up or servicing MIG welding equipment.

Technical Specifications

• Amperage Rating: 400 amps
• Cable Length: 20 feet
• Maximum Wire Size: .045 inches
• Power Pin Style: Miller Rear
• Consumable Type: Tweco-compatible
• Weight: 16 pounds

Standard Information

• Brand: XTRWELD
• Manufacturer Part Number: 420-3545M