Tweco 1230-1102 Mig Nozzle 3/8 Inch Bore 450 Amp

Product Description

The TWECO 1230-1102 is a self-insulated MIG welding nozzle built for heavy-duty applications up to 450 amps. It features a 0.375-inch bore, a 3.11-inch overall length, and a 0.75-inch outer diameter. The three-piece construction includes a nozzle housing cut and formed from 122 DHP copper alloy tubing, a nozzle insert machined from solid brass, and a nozzle insulator made from G7 silicone material. The silicone insulator provides the required electrical isolation from the gas diffuser without the need for a separate add-on insulator. The part number is rolled-stamped on the outer surface for quick field identification. Licensed welders and MIG technicians use this nozzle in production and maintenance welding environments.

The 1230-1102 is designed for use with Tweco No. 3 MIG guns rated up to 450 amps. It is suited for heavy-duty welding applications where higher amperage and longer electrical stick-out are common. The flush contact tip relationship of 0.062 inches accommodates setups where the tip is positioned closer to the workpiece. The nozzle threads include a 9/16-inch-18 UNC-2B thread size that interfaces with the conductor tube assembly. This nozzle is sold in a minimum quantity of 2 per pack, making it practical for shops stocking spares or running multiple guns on a shift.

Key Features

• 0.375-inch bore and 3.11-inch length for standard gas diffuser fitment on No. 3 MIG guns
• Rated up to 450 amps for heavy-duty welding service
• Nozzle housing formed from 122 DHP copper alloy tubing for high thermal conductivity
• Nozzle insert machined from solid brass with internal threads matched to conductor tube OD threads
• G7 silicone nozzle insulator provides electrical isolation from the gas diffuser without an additional separate insulator
• Part number rolled-stamped on outer surface for fast identification in the field

Compatibility

Designed for use with Tweco No. 3 MIG guns rated up to 450 amps using a standard gas diffuser. The 9/16-inch-18 UNC-2B thread engages the conductor tube assembly directly.

Installation Notes

Installation and replacement of MIG nozzles should be performed by a qualified welder or welding technician. Always de-energize and allow the MIG gun to cool before removing or installing the nozzle. Thread the nozzle onto the conductor tube by hand first to avoid cross-threading, then snug with an appropriate wrench. Inspect the silicone insulator for damage during each nozzle change, as a compromised insulator can result in unwanted arc contact with the diffuser.

Technical Specifications

• Bore Size: 0.375 inches
• Overall Length: 3.11 inches
• Outer Diameter: 0.75 inches
• Thread Size: 9/16 inches-18 UNC-2B
• Flush Contact Tip Relationship: 0.062 inches
• Amperage Rating: 450 amps
• Nozzle Housing Material: 122 DHP Copper Alloy
• Nozzle Insert Material: Solid Brass
• Nozzle Insulator Material: G7 Silicone
• Package Quantity: 2 per pack
• Weight: 0.2 pounds

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1230-1102