Tweco 1240-1202 Mig Welding Nozzle 450A 0.75 Inch Bore

Product Description

The TWECO 1240-1202 is a slip-on MIG welding nozzle engineered for heavy-duty applications up to 450 amps. It fits the Tweco SprayMaster HD22 MIG gun and is compatible with standard gas diffusers. The nozzle measures 3.21 inches in length with a 0.75-inch bore and a 0.875-inch outer diameter. It features a three-piece construction: 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 part number is roll-stamped on the outer surface for quick identification in the field.

This nozzle is designed for medium to heavy-duty MIG welding applications requiring up to 450A of continuous capacity. The recessed contact tip relationship of 0.125 to 0.156 inches makes it well-suited for tack, spot, and stitch welding, high-heat passes, and situations where the nozzle may contact the workpiece. It is sold in a pack of two and is intended for use by professional welders and fabricators working with Tweco SprayMaster HD22 MIG guns in industrial and heavy fabrication environments.

Key Features

• Three-piece design eliminates the need for a separate insulator
• Nozzle housing formed from 122 DHP copper alloy tubing for high-heat resistance
• Nozzle insert machined from solid brass and crimped in place to slide over the gas diffuser metal spring
• G7 silicone nozzle insulator provides required electrical insulation from the gas diffuser
• Recessed tip relationship of 0.125 to 0.156 inches suits higher-heat and workpiece-contact scenarios
• Part number roll-stamped on outer surface for fast identification
• Sold as a 2-piece pack

Compatibility

Designed for use with Tweco SprayMaster HD22 MIG guns rated up to 450A and compatible with standard Tweco gas diffusers.

Installation Notes

Installation is performed by professional welders or MIG equipment technicians. Always power down and de-energize the welding system before servicing front-end consumables. Slide the nozzle onto the gas diffuser metal spring until fully seated before resuming operation. Inspect the nozzle insulator and housing for wear or spatter buildup at regular intervals, as degraded components can affect shielding gas coverage and arc quality.

Technical Specifications

• Bore Size: 0.75 inches
• Nozzle Length: 3.21 inches
• Outer Diameter: 0.875 inches
• Current Capacity: 450A
• Recessed Tip Relationship: 0.125 to 0.156 inches
• 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: 1240-1202