Miller Enterprises
Miller Enterprises 300371 Spool Gun 135 A 12 ft 4 in hand tool
Air-cooled MIG spool gun rated at 135 A with a 30 % duty cycle, 12 ft cable and 4 in spool capacity for aluminium wire up to .035 in
- TypeAngle, Pitch & Slope Locators
- 135 A maximum current handles aluminium MIG welds
- 30 % duty cycle sustains output for short runs
- 12 ft cable gives reach around the workpiece
- 4 in spool capacity fits standard aluminium wire spools
- .035 in maximum wire diameter matches common aluminium filler
Spool gun for aluminium MIG
The Miller Enterprises 300371 is a 135 A air-cooled spool gun built for MIG welding aluminium. It uses a 4 in spool capacity and feeds wire up to 0.035 in diameter through a 12 ft cable. The pistol-grip handle and standard trigger give direct control for GMAW work.
Best for light aluminium fabrication
Suits welders running a compatible Miller power source who need a portable gun for thin aluminium sheet or repair jobs. The 30 % duty cycle at 135 A limits continuous bead length, so it is not for heavy structural work or high-volume production runs.
135 A maximum current rating
This amperage ceiling decides whether the gun matches the joint thickness and travel speed you plan to run. Exceeding it will overheat the head and disrupt wire feed, so verify your procedure stays within 135 A before fitting the gun.
Highlights
- 135 A maximum current handles aluminium MIG welds
- 30 % duty cycle sustains output for short runs
- 12 ft cable gives reach around the workpiece
- 4 in spool capacity fits standard aluminium wire spools
- .035 in maximum wire diameter matches common aluminium filler
Specifications
| Brand | MILLER ELECTRIC |
|---|---|
| Type | Angle, Pitch & Slope Locators |
Questions about this item
How do I connect the 12 ft Spoolmate 100 gun to my Miller machine, and what step is often missed?
Attach the Miller-compatible rear connection to the feeder, insert a 4 in aluminum spool, set the drive rolls for .035 in wire, and select Argon gas — many users forget to match the drive roll groove to the wire size.
Which parts of the Spoolmate 100 gun will wear out and need replacement during aluminum MIG welding?
The Spoolmate series contact tips and the 4 in spool of aluminum wire are the primary consumables; tips should be inspected and changed when the bore becomes oval or worn.
How long can I weld continuously at the 135 A rating before the 30 percent duty cycle forces a pause?
At 135 amps the gun runs for about three minutes out of every ten; after that the air-cooled cable and handle need to cool before you resume welding.
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