Tweco 1240-1201 Mig Nozzle Slip-on 5/8 Inch Bore 450A HD22

Product Description

The TWECO 1240-1201 is a heavy-duty slip-on MIG welding nozzle designed for use with 450A Tweco SprayMaster MIG guns. The nozzle features a 5/8 inch (0.625 inch) bore, a 0.875 inch outer diameter, and an overall length of 3.21 inches. It 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. Built from 122 DHP copper alloy tubing with a solid brass insert and a G7 silicone insulator, this three-piece assembly delivers reliable electrical insulation and thermal performance in demanding welding environments. Licensed welding professionals and MIG gun technicians are the primary installers.

This nozzle is rated for medium to heavy-duty welding applications up to 450 amps. The recessed tip geometry is particularly appropriate for higher-heat applications, tack welding, spot welding, and stitch welding where the nozzle may periodically contact the workpiece. The nozzle insert slides over the metal spring of the gas diffuser, eliminating the need for a separate insulator. The part number is rolled and stamped on the outer surface for quick identification in the field. Sold in a pack of 2.

Key Features

• Slip-on design fits standard Tweco gas diffusers without an additional insulator
• 122 DHP copper alloy nozzle housing for high conductivity and heat resistance
• Solid brass nozzle insert machined and crimped to slide over the gas diffuser metal spring
• G7 silicone nozzle insulator provides required electrical isolation from the gas diffuser
• Recessed tip relationship (0.125 to 0.156 inches) suited for longer stick-out and workpiece-contact scenarios
• Part number stamped on outer surface for fast field identification

Compatibility

Designed for use with 450A Tweco SprayMaster MIG guns using a standard gas diffuser configuration.

Installation Notes

Installation is performed by a qualified welding technician or MIG gun service professional. Always disconnect and de-energize the welding power source before replacing front-end consumables. Confirm the nozzle slides fully onto the gas diffuser spring before resuming operation. Inspect the silicone insulator for damage during each nozzle change to ensure proper electrical isolation.

Technical Specifications

• Bore Diameter: 0.625 inches
• Outer Diameter: 0.875 inches
• Nozzle Length: 3.21 inches
• Amperage Rating: 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
• Weight: 0.22 pounds
• Package Quantity: 2 per pack

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1240-1201