MIG support

Miller MDX Series MIG Gun Support

MDX-100 support page for Millermatic 142 and 211 users, with parts lookup, replacement path guidance, troubleshooting shortcuts, and Amazon links shown only when verified.

Catalog Listed142 / 211 Path Confirmedmig_gun

Miller MDX MIG Gun

Use this page to confirm the MDX gun path, then match item numbers to the diagram and parts table below.

Compatible Machines

Millermatic 211Older discontinued 211 ownership path. Millermatic 211 PROCurrent catalog 211 PRO ownership path. Multimatic 220 AC/DCMulti-process ownership path. Millermatic SeriesSeries-level Miller MIG machine support.

Most Common Replacement Parts

Common Consumables

MDX Contact TipsMatch wire size and tip family. MDX NozzlesChoose nozzle style by gun and application. MDX DiffusersMatch diffuser to nozzle/tip system. MDX LinersMatch liner to wire size and gun length.

Breakdown Diagram

Jump to MDX Diagram and Parts Table
Need More Help?

For birdnesting, check drive-roll tension first, then inspect liner condition, contact tip wear, and wire quality.

Item number lookup

Parts List

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Item # Part # Description Qty Status Buy
Gun 1770028
MDX-100, 10 ft. (3 m), 100 A, 100% with CO2 gas, 60% with mixed gas
gun assembly MDX-100 gun models Wire size: .030 - .035 in. (0.8 - 0.9 mm) Consumable path: Standard duty.
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed Birdnesting
1 Catalog Listed View on Amazon
Gun 1770029
MDX-100, 15 ft. (4.6 m), 100 A, 100% with CO2 gas, 60% with mixed gas
gun assembly MDX-100 gun models Wire size: .030 - .035 in. (0.8 - 0.9 mm) Consumable path: Standard duty.
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed Birdnesting
1 Catalog Listed N/A
1 NS-M1200B
1/2 in. ID flush brass nozzle
nozzle MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed Overheating nozzle
Confirm Catalog Listed N/A
1 NS-M1200C
1/2 in. ID flush copper nozzle
nozzle MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed Overheating nozzle
Confirm Catalog Listed View on Amazon
1 NS-MFLX
Gasless nozzle
nozzle MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed Overheating nozzle
Confirm Catalog Listed N/A
2 T-M023
.023 in. MDX standard-duty contact tip
contact tip MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed BurnbackBirdnestingPoor wire feedErratic arcTip seizure
Confirm Catalog Listed View on Amazon
2 T-M030
.030 in. MDX standard-duty contact tip
contact tip MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed BurnbackBirdnestingPoor wire feedErratic arcTip seizure
Confirm Catalog Listed View on Amazon
2 T-M035
.035 in. MDX standard-duty contact tip
contact tip MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed BurnbackBirdnestingPoor wire feedErratic arcTip seizure
Confirm Catalog Listed View on Amazon
2 T-M045
.045 in. MDX standard-duty contact tip
contact tip MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed BurnbackBirdnestingPoor wire feedErratic arcTip seizure
Confirm Catalog Listed View on Amazon
2 T-M047
3/64 in. MDX standard-duty contact tip
contact tip MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed BurnbackBirdnestingPoor wire feedErratic arcTip seizure
Confirm Catalog Listed View on Amazon
3 D-M100
MDX-100 diffuser
diffuser MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed BurnbackOverheating nozzleErratic arcTip seizure
Confirm Catalog Listed View on Amazon
4 LM1A-10
10 ft. MDX liner, .023-.025 in. wire
liner MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed BurnbackBirdnestingPoor wire feedWorn liner
Confirm Catalog Listed View on Amazon
4 LMD2A-10
10 ft. MDX liner, .030-.035 in. wire
liner MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed BurnbackBirdnestingPoor wire feedWorn liner
Confirm Catalog Listed View on Amazon
4 LMD3A-10
10 ft. MDX liner, .035-.045 in. wire
liner MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed BurnbackBirdnestingPoor wire feedWorn liner
Confirm Catalog Listed View on Amazon
Power pin cap 2200360
.023-.030 in. MDX power pin cap
power pin cap MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed Poor wire feedErratic arc
Confirm Catalog Listed N/A
Power pin cap 2200361
.030-.035 in. MDX power pin cap
power pin cap MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed Poor wire feedErratic arc
Confirm Catalog Listed N/A
Power pin cap 2200362
.035-.045 in. MDX power pin cap
power pin cap MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed Poor wire feedErratic arc
Confirm Catalog Listed N/A
Kit 1880272
MDX-100 consumable kit, .023 in. wire
consumable kit MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed
Confirm Catalog Listed N/A
Kit 1880273
MDX-100 consumable kit, .030 in. wire
consumable kit MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed
Confirm Catalog Listed N/A
Kit 1880274
MDX-100 consumable kit, .035 in. wire
consumable kit MDX-100 consumables and replacement parts
MDX-100 family Catalog ListedMillermatic 142 path Machine path confirmedMillermatic 211 PRO path Machine path confirmedMultimatic 215 PRO path Catalog ListedMultimatic 220 AC/DC path Catalog Listed
Confirm Catalog Listed N/A

Related consumables

Related Families and Parts

Millermatic 142

Catalog-listed MDX-100 machine path.

Open related path Catalog Listed

Millermatic 211 PRO

Catalog-listed MDX-100 machine path.

Open related path Catalog Listed

Miller M-10/M-15 Gun

Legacy gun family replaced through the M-Series to MDX-100 path.

Open related path Catalog Listed

Millermatic 142

Machine path connected to this support path.

Open machine page Machine path confirmed

Millermatic 211 PRO

Machine path connected to this support path.

Open machine page Machine path confirmed

Multimatic 215 PRO

Machine path connected to this support path.

Open machine page Catalog Listed

Multimatic 220 AC/DC

Machine path connected to this support path.

Open machine page Catalog Listed

Ecosystem lifecycle

Replacement Chain

Current Generation 3 Partial Compatibility

M-10/M-15 -> M-100/M-150 -> MDX-100

  1. M-10 / M-15

    Legacy gun ecosystem.

    Generation 1 Legacy Confirm Source
  2. M-100 / M-150

    Intermediate replacement generation.

    Generation 2 Superseded Confirm Source
  3. MDX-100

    Current replacement ecosystem.

    Generation 3 Current Confirm Source
Consumables still compatible?

Do not inherit consumable compatibility across M-Series to MDX generations until an OEM source confirms exact overlap.

do not assume Confirm Source Confirm Fitment

Upgrade Guidance

  • Use the replacement chain as navigation and upgrade guidance, not automatic consumable compatibility.
  • Verify exact gun stock number and machine package before ordering replacement parts.

Troubleshooting relationships

Symptoms Connected to Parts

Burnback or Tip Sticking

Wire burns back into the contact tip or sticks at the tip.

Review contact tip, diffuser, liner condition, drive rolls, and machine setup before replacing larger assemblies.

Likely rows: 2 / T-M023, 2 / T-M030, 2 / T-M035, 2 / T-M045, 2 / T-M047, 3 / D-M100, 4 / LM1A-10, 4 / LMD2A-10, 4 / LMD3A-10

Confirm Fitment

Birdnesting at the Feeder

Wire tangles or piles up near the feeder before feeding through the gun.

Common review path includes liner, tip, drive roll pressure, spool tension, and machine settings.

Likely rows: Gun / 1770028, Gun / 1770029, 2 / T-M023, 2 / T-M030, 2 / T-M035, 2 / T-M045, 2 / T-M047, 4 / LM1A-10, 4 / LMD2A-10, 4 / LMD3A-10

Confirm Fitment

Poor Wire Feed

Wire speed feels inconsistent or the arc stutters during travel.

Review feed-path wear parts first, then machine-side settings and drive rolls.

Likely rows: 2 / T-M023, 2 / T-M030, 2 / T-M035, 2 / T-M045, 2 / T-M047, 4 / LM1A-10, 4 / LMD2A-10, 4 / LMD3A-10, Power pin cap / 2200360, Power pin cap / 2200361, Power pin cap / 2200362

Confirm Fitment

Overheating Nozzle

Nozzle runs unusually hot or spatter builds rapidly around the front end.

Review nozzle, diffuser, insulator, gooseneck, and stickout/setup before assuming the gun body has failed.

Likely rows: 1 / NS-M1200B, 1 / NS-M1200C, 1 / NS-MFLX, 3 / D-M100

Confirm Fitment

Erratic Arc

Arc starts, stops, or sounds unstable while wire is feeding.

Review contact-tip fit, diffuser condition, electrical connection, and machine setup.

Likely rows: 2 / T-M023, 2 / T-M030, 2 / T-M035, 2 / T-M045, 2 / T-M047, 3 / D-M100, Power pin cap / 2200360, Power pin cap / 2200361, Power pin cap / 2200362

Confirm Fitment

Contact Tip Seizure

Contact tip sticks in the diffuser or cannot be removed cleanly.

Review tip/diffuser fit, heat history, and thread condition.

Likely rows: 2 / T-M023, 2 / T-M030, 2 / T-M035, 2 / T-M045, 2 / T-M047, 3 / D-M100

Confirm Fitment

Worn Liner

Wire drag increases, feed becomes inconsistent, or wire size changes require liner review.

Match liner by gun length and wire size before ordering.

Likely rows: 4 / LM1A-10, 4 / LMD2A-10, 4 / LMD3A-10

Confirm Fitment

Source references

Verification Notes

Miller MDX-100 MIG Gun corrected Miller catalog rows

MDX-100 stock numbers, power source suggestions, consumables.

Document: source-bf756b1d2b74 · Page: 23

Catalog Listed

MDX-100 fitment notes

MDX-100 is the current gun path for Millermatic 142 and Millermatic 211. Confirm exact machine package and gun configuration before ordering.

Document: source-review-roadmap-step2-2026-05-25 · Page: Unknown

Machine path confirmed