Processes
MIG (GMAW), Pulsed MIG (GMAW-P), Flux-cored (FCAW)
Miller MIG Machine Support
Millermatic 255
Industrial MIG, pulsed MIG, and flux-cored machine with MDX-250 gun, Auto-Set, program storage, and push-pull gun support.
MIG (GMAW)Pulsed MIG (GMAW-P)Flux-cored (FCAW)
Industrial
Welding range
20 - 350 A
Input power
208 - 240 V, single-phase
Wire feed speed
50 - 800 ipm (1.3 - 20 m/min.)
Weight
84 lb. (38 kg), power source only
Class
Industrial
Machine Packages
| Stock number | Catalog package |
|---|---|
| 907734 | Power source |
| 951766 | With EZ-Latch single cylinder running gear |
Compatible Accessories
EZ-Latch Single Cylinder Running Gear
301449 Most popular accessory listed for this machine.
Support page pendingEZ-Latch Dual Cylinder Running Gear
951769 Most popular accessory listed for this machine.
Support page pendingProtective Cover
301521 Most popular accessory listed for this machine.
Support page pendingCompatible Guns / Torches
MDX-250 MIG Gun
Included 250-amp gun and consumable path.
Open support pageXR-Aluma-Pro Air-Cooled Push-Pull Gun
Catalog-listed recommended aluminum solution.
Support page pendingSpoolmatic Spool Gun
Catalog-listed popular accessory.
Open support pageXR-Pistol-Pro Air-Cooled Push-Pull Gun
Catalog-listed popular accessory.
Support page pendingMiller Catalog Accessories
These accessories are placed here only when the Miller catalog names this machine, torch, feeder, or family path. Verify plug style, voltage, package, and serial-specific details before ordering.
| Part | Accessory | Catalog fitment | Source / path |
|---|---|---|---|
| 301481 | EZ-Latch Dual Cylinder Rack with Elevated Gun and Cable Rack | For Millermatic 255/355 and Multimatic 235/255; converts 301449. | Catalog p. 122 Open support path |
Full machine details
Welding Output
- 230 A at 25.5 VDC, 60% duty cycle
Wire Capacity
- Solid/stainless: .023 - .045 in. (0.6 - 1.2 mm)
- Aluminum: .035 - .047 in. (0.9 - 1.2 mm)
- Flux-cored: .030 - .045 in. (0.8 - 1.2 mm)
- Silicon bronze: .030 - .035 in. (0.8 - 0.9 mm)
Material Capacity
- Mild steel: 24 ga. (0.6 mm) to 1/2 in. (13 mm)
- Aluminum: 18 ga. (1.2 mm) to 1/2 in. (13 mm)
Included With This Machine
- 15 ft. (4.6 m) 250-amp MDX-250 MIG gun with MDX heavy duty consumables
- 10 ft. (3 m) work cable with clamp
- 10 ft. (3 m) industrial power cord
- Factory-installed gas solenoid
- .035/.045 in. reversible V-groove drive rolls
- Flow gauge regulator and gas hose for argon or Ar/CO2 mix, extra contact tips, and material thickness gauge
Dimensions
H: 19.25 in. (489 mm), W: 13.75 in. (349 mm), D: 24.25 in. (616 mm)
Source: Miller Electric 2026 Full-line Catalog, catalog page 7, literature DC/12.8. Product relationships on this page are kept separate from Amazon monetization data. Amazon buy buttons appear only after the product match, manufacturer, package quantity, and compatibility are verified.