New Miller MDX Series MIG Guns are Offered with Front-Loading Liner Locks

Press Release Summary:

  • Consist of MDX-100, MDX-250 and MDX-250 EZ-Select™ models
  • Offered with tapered connection between contact tip, gas diffuser and neck
  • Feature ergonomic handle with rubber overmolding and are compatible with AccuLock series consumables

Original Press Release:

New Miller® MDX™ Series MIG Guns with AccuLock™ Consumables Improve Operator Comfort, Provide Superior Wire Feeding

MIG guns are compatible with Miller AccuLock MDX and Bernard® AccuLock S Consumables

APPLETON, Wis. (February 6, 2019) — Miller Electric Mfg. LLC has introduced its new MDX Series MIG guns. Designed with operator comfort in mind, these MIG guns feature a durable and ergonomic handle with a rubber overmolding for improved grip, while the addition of a ball and socket handle swivel reduces fatigue.

AccuLock Series consumables add to the performance of the gun, providing a flawless wire feed path. The front-loading liner locks in place (no need for set screws) and aligns concentrically with both the contact tip and power pin to optimize wire feeding. Error-proof liner trimming, with no measuring required, reduces burnbacks, bird-nesting and erratic arc caused by liners that are too short, minimizing downtime for troubleshooting or rework.

The MDX Series includes three models: MDX-100, MDX-250 and MDX-250 EZ-Select™. These guns are all compatible with Miller AccuLock MDX Series consumables, and the MDX-250 and MDX-250 EZ-Select guns are also compatible with Bernard AccuLock S consumables. Both AccuLock Series feature tapered connections between the contact tip, gas diffuser and neck to maximize electrical conductivity for longer product life. Coarse thread on the contact tips speeds replacement by mating easily with the gas diffuser and lessens the risk of cross-threading.

Bernard AccuLock S Consumables are an excellent upgrade to increase durability and consumable life when welding with MDX-250 or MDX-250 EZ-Select guns in heavier industrial environments. They also simplify consumable inventory for operations using a mix of Miller MDX and Bernard MIG Guns.

Miller offers conversion parts to retrofit older style Miller MIGmatic M-Series guns with AccuLock MDX and AccuLock S consumables. M-Series consumables will not be compatible on the new MDX Series MIG guns.

Gun compatibility and capabilities
The MDX Series guns will be made available on multiple Miller power sources.

The MDX-100 is rated at 100 amps. It pairs with the following:

  • Millermatic® 141
  • Millermatic 211
  • Multimatic® 215
  • Multimatic 220 AC/DC

The MDX-250 contains increased copper in the cable, is pulse welding capable, and can be used with CV waveforms. It is compatible with the following:

  • Millermatic 212 Auto-Set™
  • Millermatic 252
  • Millermatic 255
  • Multimatic 200
  • Multimatic 255

The MDX-250 EZ-Select gun features trigger program select that allows the user to select up to four weld programs by tapping the MIG gun trigger, saving time for walking to the machine to make changes. To help avoid errors, the gun features LED lights on the handle to indicate the weld program that is currently selected. It works with the following:

  • Millermatic 255
  • Multimatic 255

For more information, visit

About Miller

Miller Electric Mfg. LLC, headquartered in Appleton, Wisconsin, is a leading worldwide manufacturer of Miller® brand arc welding products and is a wholly owned subsidiary of Illinois Tool Works Inc. (NYSE: ITW). For more information, visit, call 1-800-4-A-Miller (800-426-4553), email, fax 877-327-8132, or write to Miller Electric Mfg. LLC, P.O. Box 100, Lithonia, GA 30058.

Miller Contact:

Diane Heldt

Two Rivers Marketing


About Bernard

For more information about Bernard’s welding products, visit, call 1-855-MIGWELD (1-855-644-9353), fax 1-888-946-6726, email or write Bernard, 449 West Corning Road, Beecher, IL 60401. Outside North America, call +1-519-737-3030 or fax +1-708-946-6726. Bernard, located in Beecher, Ill., manufactures premium semi-automatic GMAW (MIG) and FCAW (flux-cored) welding guns, consumables, accessories and manual arc products. For more than 70 years, Bernard has been an innovator in heavy-duty MIG welding and a contributor to improved welding productivity. Bernard is a division of Miller Electric Mfg. LLC, a leading worldwide manufacturer of Miller brand arc welding products.

Bernard Contact:

Monica DeBrot

Two Rivers Marketing


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