Tweco 1230-1221 Mig Nozzle 5/8 in Bore 450A 2 Pack

Product Description

The TWECO 1230-1221 is a heavy-duty MIG welding nozzle designed for use with standard gas diffusers in high-amperage welding applications. Built to handle up to 450 amps, this nozzle features a 5/8-inch (0.625-inch) bore and an overall length of 3.219 inches with a 0.97-inch outer diameter. It uses a 9/16-inch-18 UNC-2B thread and is constructed in a three-piece configuration: a copper alloy nozzle housing, a solid brass machined nozzle insert, and a silicone nozzle insulator. The part number is rolled-stamped on the outer surface for fast identification in the field. Sold as a pack of 2.

This nozzle is suited for heavy-duty MIG welding operations in industrial, fabrication, and structural welding environments where sustained high-amperage output is required. The 0.125-inch to 0.156-inch recess contact tip relationship supports consistent arc performance. The three-piece design eliminates the need for a separate external insulator, keeping the torch assembly compact. It threads directly onto the conductor tube assembly, making it a practical replacement for worn or damaged nozzles on compatible TWECO-style torches.

Key Features

• Rated up to 450 amps for sustained heavy-duty welding cycles
• 5/8-inch bore with 3.219-inch length and 0.97-inch outer diameter
• Nozzle housing cut and formed from copper alloy tubing for heat resistance
• Nozzle insert machined from solid brass with internal threads matched to conductor tube OD threads
• Silicone nozzle insulator provides electrical insulation from the gas diffuser without an additional insulator component
• Part number rolled-stamped on outer surface for easy field identification
• Sold as 2 per pack

Compatibility

Designed for use with standard gas diffusers; compatible with TWECO Weldskill 23 Series torch assemblies as stated by the manufacturer. Thread size is 9/16-inch-18 UNC-2B.

Installation Notes

Installation and replacement of MIG welding nozzles is performed by qualified welding technicians or maintenance personnel. Always disconnect the torch from the power source and allow all components to cool completely before handling. Thread the nozzle onto the conductor tube assembly by hand to avoid cross-threading, then snug firmly. Inspect the nozzle insulator and insert for wear at each replacement interval to maintain proper gas coverage and arc stability.

Technical Specifications

• Bore Size: 0.625 inches
• Nozzle Length: 3.219 inches
• Outer Diameter: 0.97 inches
• Maximum Amperage: 450 amps
• Thread Size: 9/16-inch-18 UNC-2B
• Contact Tip Recess: 0.125 to 0.156 inches
• Housing Material: Copper alloy
• Insert Material: Solid brass
• Insulator Material: Silicone
• Package Quantity: 2 per pack
• Weight: 0.35 pounds

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1230-1221