Tweco 1240-1241 Slip-on Mig Nozzle 5/8 Inch Bore 450A

Product Description

The TWECO 1240-1241 is a heavy-duty slip-on MIG welding nozzle engineered for use with 450-amp Tweco SprayMaster MIG guns. It features a 5/8-inch (0.625-inch) bore, an outer diameter of 1.117 inches, and a length of 3.29 inches. The nozzle uses a recessed contact tip relationship of 0.125 to 0.156 inches, making it well suited for applications requiring longer electrical stick-out or situations where the nozzle may contact the workpiece. The part number is rolled and stamped on the outer surface for fast field identification. Sold in a pack of 2, this nozzle is intended for professional welders working in high-amperage, heavy-duty environments.

This nozzle is designed for heavy-duty MIG welding applications drawing up to 450 amps. The recessed tip configuration is appropriate for higher heat applications, tack welding, spot welding, and stitch welding where longer electrical stick-out is needed or where nozzle-to-workpiece contact is likely. It fits standard gas diffusers compatible with the Tweco SprayMaster MIG gun platform and is a direct fit for HD24-series front-end consumable setups.

Key Features

• 3-piece design: nozzle housing, nozzle insert, and nozzle insulator — no additional insulator required
• Nozzle housing cut and formed from 122 DHP copper alloy tubing for high conductivity and heat resistance
• Nozzle insert machined from solid brass and crimped in place to slide over the gas diffuser metal spring
• Nozzle insulator constructed from G7 silicone material, providing electrical insulation from the gas diffuser
• Recessed contact tip relationship of 0.125 to 0.156 inches for longer stick-out and workpiece contact tolerance
• Part number rolled and stamped on outer surface for easy identification during service

Compatibility

Designed for use with 450-amp Tweco SprayMaster MIG guns and fits standard gas diffusers within that gun platform.

Installation Notes

Installation is performed by qualified welding technicians or MIG gun service personnel. Power down and disconnect the welding machine before replacing front-end consumables. Ensure the gas diffuser spring is clean and undamaged before sliding the nozzle insert into place. Do not overtighten or force the slip-on fit, as this can damage the nozzle insulator or the diffuser spring.

Technical Specifications

• Bore Diameter: 0.625 inches
• Nozzle Length: 3.29 inches
• Outer Diameter: 1.117 inches
• Amperage Rating: 450 amps
• Contact Tip Recess: 0.125 to 0.156 inches
• Nozzle Housing Material: 122 DHP copper alloy
• Nozzle Insert Material: Solid brass
• Nozzle Insulator Material: G7 silicone
• Weight: 0.28 pounds
• Package Quantity: 2 per pack

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1240-1241