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
Millermatic 255

Processes

MIG (GMAW), Pulsed MIG (GMAW-P), Flux-cored (FCAW)

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 numberCatalog package
907734 Power source
951766 With EZ-Latch single cylinder running gear

Welding Output and Wire Capacity

Rated 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

Gun, Consumable, and Accessory Paths

XR-Aluma-Pro Air-Cooled Push-Pull Gun

Catalog-listed recommended aluminum solution.

Support page pending

XR-Pistol-Pro Air-Cooled Push-Pull Gun

Catalog-listed popular accessory.

Support page pending

EZ-Latch Single Cylinder Running Gear

301449 Most popular accessory listed for this machine.

Support page pending

EZ-Latch Dual Cylinder Running Gear

951769 Most popular accessory listed for this machine.

Support page pending

Protective Cover

301521 Most popular accessory listed for this machine.

Support page pending

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.