Lincoln Magnum PRO 400 Water Cooled MIG Welding Gun - K4521-2-10-45

By: Lincoln Electric
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The Magnum PRO Water-Cooled Welding Guns are built to tackle high-heat applications while maintaining operator comfort.

  • 100% Duty Cycle – The 400A and 500A guns run at 100% duty cycle using 90/10 mixed gas, making them ideal for high heat applications
  • Premium Tip Performance – The large diameter and mass of the Magnum PRO Copper Plus contact tips help disperse heat and keep the tips cooler, expanding their life
  • Expendables Built for High Heat – The 500A water-cooled gooseneck design keeps the nozzle cool in high-heat applications
  • OverMolded Handle Design – The soft rubber over molding enhances comfort and allows for an easier grip of the gun

Top Features

  • Rated at 100% Duty Cycle.
  • Industrial Grade Construction.
  • Premium Tip Performance
  • Expendables Built for High Heat
  • OverMolded Handle Design


MIG, Pulsed MIG, Flux-Cored

Wire Diameter Range

.035-5/64 (0.9-2.0)

What's Included

  • 60° Gun Tube – KP4527-60 (400A Guns), KP4526-60 (500A Guns)
  • Diffuser – KP4380-1
  • Insulator – KP4525-1
  • 0.045 in. Contact Tip – KP2745-045
  • 1/8 in. Recessed, 5/8 in. ID Nozzle KP4523-1-62R
  • 0.035-0.045 in., 15 ft. Liner – KP44-3545-15
Duty Cycle at Rated Amperage 100%
Rated Amperage 400
Gun Type Handheld
Cable Length 15ft (4.5m)
Wire Diameter .035-5/64 (0.9-2.0)
Cooling Water cooled
Net Weight 10.00 (4.54 kg)