Tweco 1230-1130 Mig Nozzle 3/4 Inch Bore 450A Self-insulated

Product Description

The TWECO 1230-1130 is a 23 Series self-insulated MIG welding nozzle engineered for heavy-duty applications up to 450 amps. Designed for use with Tweco No. 3 MIG guns and standard gas diffusers, the nozzle features a 3/4-inch bore and an outer diameter of 0.875 inches. At 3.219 inches in length, it uses a 9/16-18 UNC-2B thread for mounting to the conductor tube assembly. A recess contact tip relationship of 0.125 to 0.156 inches makes this nozzle well-suited for applications requiring longer electrical stick-out or where the nozzle may contact the workpiece. Sold in a pack of two, it is installed by welding technicians in production and heavy-duty fabrication environments.

This nozzle fits standard gas diffuser configurations on Tweco No. 3 MIG guns rated up to 450 amps, making it appropriate for high-amperage MIG welding in both shop and field settings. The recessed contact tip design is particularly useful in applications where longer stick-out is needed or where nozzle-to-workpiece contact is likely. The part number is rolled and stamped on the outer surface for quick identification during gun maintenance and changeover. Each pack contains two nozzles, supporting efficient inventory management for operations with high consumable turnover.

Key Features

• 3/4-inch bore designed for standard gas diffuser on Tweco No. 3 MIG guns up to 450 amps
• 3-piece construction: 122 DHP copper alloy housing, solid brass insert, and G7 silicone insulator — no additional insulator required
• 9/16-18 UNC-2B thread threads directly onto conductor tube assembly
• Recess contact tip relationship of 0.125 to 0.156 inches for extended stick-out applications
• Part number rolled and stamped on outer surface for fast field identification
• Sold as 2 per pack

Compatibility

Designed for use with Tweco No. 3 MIG guns up to 450 amps and standard gas diffuser configurations.

Installation Notes

Installation is performed by a qualified welding technician or MIG gun maintenance professional. Power down and de-energize the welding system fully before removing or installing nozzle consumables. Thread the nozzle onto the conductor tube assembly by hand until snug, taking care not to cross-thread the 9/16-18 UNC-2B connection. Inspect the silicone insulator for damage during each consumable changeout to ensure proper electrical isolation from the gas diffuser.

Technical Specifications

• Bore Size: 3/4 inch
• Outer Diameter: 0.875 inches
• Length: 3.219 inches
• Thread Size: 9/16-18 UNC-2B
• Recess Contact Tip Relationship: 0.125 to 0.156 inches
• Maximum Amperage: 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: 0.22 pounds

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1230-1130