Welding Guns
Magnum® PRO Water Cooled Welding Guns 400A - Fast-Mate
K4521-2-FM-45
MSRP: $1,567.80
Where To Buy

Select Product

Top Features

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

Processes

MIG, Pulsed MIG, Flux-Cored

Wire Diameter Range

.035-5/64 (0.9-2.0)
Features and Benefits

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
Specifications
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)
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
Expendable Parts
Product Number
Product Name
Connector Kit - LN-7-8-9, LN-25
Connector Kit - LF-72-74, LN-25 Pro, Power Feed 25M
Connector Kit - Tweco® No. 2, No. 3, No. 4
Connector Kit - Miller® Feeders
Connector Kit - LN-8-9 - 1/16 & Larger
Contact Tips
Product Number
Product Name
Copper Plus® Contact Tip 550A .035 in (0.9 mm)
Copper Plus® Contact Tip 550A .035 in (0.9 mm) - 100/pack
Copper Plus® Contact Tip 550A .035 in (0.9 mm) Extended Life
Copper Plus® Contact Tip 550A .035 in (0.9 mm) Extended Life - 100/pack
Copper Plus® Contact Tip 550A .040 in (1.0 mm)
Copper Plus® Contact Tip 550A .040 in (1.0 mm) - 100/pack
Copper Plus® Contact Tip 550A .045 in (1.2 mm)
Copper Plus® Contact Tip 550A .045 in (1.2 mm) - 100/pack
Copper Plus® Contact Tip 550A .045 in (1.2 mm) Extended Life
Copper Plus® Contact Tip 550A .045 in (1.2 mm) Extended Life - 100/pack
Copper Plus® Contact Tip 550A .052 in (1.3 mm)
Copper Plus® Contact Tip 550A .052 in (1.3 mm) - 100/pack
Copper Plus® Contact Tip 550A .052 in (1.3 mm) Extended Life
Copper Plus® Contact Tip 550A .052 in (1.3 mm) Extended Life - 100/pack
Copper Plus® Contact Tip 550A .068 -.072 in (1.7-1.8 mm)
Copper Plus® Contact Tip 550A .068 -.072 in (1.7-1.8 mm) - 100/pack
Copper Plus® Contact Tip 550A .068 -.072 in (1.7-1.8 mm) Extended Life
Copper Plus® Contact Tip 550A .068 -.072 in (1.7-1.8 mm) Extended Life - 100/pack
Copper Plus® Contact Tip 550A,1/16 in (1.6 mm)
Copper Plus® Contact Tip 550A 1/16 in (1.6 mm) - 100/pack
Copper Plus® Contact Tip 550A 1/16 in (1.6 mm) Extended Life
Copper Plus® Contact Tip 550A 1/16 in (1.6 mm) Extended Life - 100/pack
Copper Plus® Contact Tip 550A 5/64 in (2.0 mm)
Copper Plus® Contact Tip 550A 5/64 in (2.0 mm) - 100/pack
Copper Plus® Contact Tip 550A 5/64 in (2.0 mm) Extended Life
Copper Plus® Contact Tip 550A 5/64 in (2.0 mm) Extended Life - 100/pack
Nozzles
Product Number
Product Name
Magnum ® PRO Water-Cooled Nozzle, Flush, 1/2" ID
Magnum ® PRO Water-Cooled Nozzle, Flush, 1/2" ID ( bulk pack of 25)
Magnum ® PRO Water-Cooled Nozzle, 1/8" Recess, 1/2" ID
Magnum ® PRO Water-Cooled Nozzle, 1/8" Recess, 1/2" ID ( bulk pack of 25)
Magnum ® PRO Water-Cooled Nozzle, 1/8" Stickout, 1/2" ID
Magnum ® PRO Water-Cooled Nozzle, 1/8" Stickout, 1/2" ID (bulk pack of 25)
Magnum ® PRO Water-Cooled Nozzle, Flush, 5/8" ID
Magnum ® PRO Water-Cooled Nozzle, Flush, 5/8" ID ( bulk pack of 25)
Magnum ® PRO Water-Cooled Nozzle, 1/8" Recess, 5/8" ID
Magnum ® PRO Water-Cooled Nozzle, 1/8" Recess, 5/8" ID (bulk pack of 25)
Magnum ® PRO Water-Cooled Nozzle, 1/8" Stickout, 5/8" ID
Magnum ® PRO Water-Cooled Nozzle, 1/8" Stickout, 5/8" ID (bulk pack of 25)
Magnum ® PRO Water-Cooled Nozzle, Flush, 3/4" ID
Magnum ® PRO Water-Cooled Nozzle, Flush, 3/4" ID ( bulk pack of 25)
Magnum ® PRO Water-Cooled Nozzle, 1/8" Recess, 3/4" ID
Magnum ® PRO Water-Cooled Nozzle, 1/8" Recess, 3/4" ID (bulk pack of 25)
Magnum ® PRO Water-Cooled Nozzle, 1/8" Stickout, 3/4" ID
Magnum ® PRO Water-Cooled Nozzle, 1/8" Stickout, 3/4" ID (bulk pack of 25)
Diffusers
Product Number
Product Name
AutoDrive SA Gas Diffuser 550A
AutoDrive SA Gas Diffuser 550A 25/pack
Liners
Product Number
Product Name
Cable Liner .052-1/16 in (1.3-1.6 mm) 15 ft (4.6 m)
Cable Liner 1/16-5/64 in (1.6-2.0 mm) 15 ft (4.6 m)
Liner Aluminum .035-3/64 in (0.9-1.2 mm) 15 ft (4.6 m)
Gun Tubes
Product Number
Product Name
Magnum ® PRO Water-Cooled 500A 45 Degree Gun Tube
Magnum ® PRO Water-Cooled 500A 60 Degree Gun Tube
Magnum ® PRO Water-Cooled 400A 45 Degree Gun Tube
Magnum ® PRO Water-Cooled 500A 60 Degree Gun Tube