Esab 633985 Mig Nozzle 3/4 Inch Bore ST-16 ST-21

Product Description

The ESAB 633985 is a Size 12 MIG nozzle with a 3/4-inch bore diameter, designed for use with water-cooled MIG welding guns. The nozzle directs shielding gas flow around the weld pool, helping to protect the arc from atmospheric contamination during the welding process. Its bore geometry is matched to the gas diffuser and contact tip arrangement standard on the ST-16 and ST-21 gun platforms. Licensed welding technicians and professional fabricators install this nozzle as a routine consumable replacement during MIG welding operations.

This nozzle is suited for water-cooled MIG gun applications in both production and maintenance welding environments. The ST-16 and ST-21 are water-cooled guns commonly deployed on higher-amperage MIG processes where air-cooled equipment would overheat. The 3/4-inch bore supports adequate shielding gas coverage across a range of wire diameters and joint configurations typical in structural, fabrication, and industrial welding work.

Key Features

• 3/4-inch bore diameter for consistent shielding gas coverage
• Size 12 nozzle designation matches ST-16 and ST-21 gun geometry
• Designed for water-cooled MIG gun platforms operating at higher duty cycles
• Sold as individual unit for straightforward consumable replenishment

Compatibility

Compatible with the ST-16 and ST-21 water-cooled MIG guns as stated by the manufacturer.

Installation Notes

MIG nozzle replacement is performed by welding technicians as part of routine gun maintenance. Before replacing the nozzle, disconnect the welding machine from its power source and allow the water-cooled gun to depressurize and cool. Inspect the gas diffuser and contact tip for wear while the nozzle is removed. Follow applicable AWS and shop safety procedures when servicing welding consumables.

Technical Specifications

• Bore Diameter: 3/4 inch
• Nozzle Size: 12
• Weight: 0.17 pounds
• Length: 1.2 inches
• Width: 6.05 inches
• Height: 3.95 inches
• Unit of Measure: Each
• UPC: 662067019229

Standard Information

• Brand: ESAB
• Manufacturer Part Number: 633985