Tweco 1220-1305 Mig Nozzle Heavy Duty 3/8 Inch Bore 250A

Product Description

The TWECO 1220-1305 is a heavy-duty copper MIG welding nozzle with a 3/8-inch bore, designed for use with Tweco Spray Master MIG guns rated up to 250 amps. Constructed from 122 DHP copper alloy, this nozzle measures 2.383 inches in length with a 0.875-inch outer diameter. It features a 3-piece design consisting of a copper alloy nozzle housing, a solid brass machined nozzle insert, and a G7 silicone nozzle insulator. The part number is rolled and stamped on the outer surface for quick field identification. Licensed welders and MIG welding technicians install this nozzle as a front-end consumable replacement on semi-automatic MIG welding setups. Sold in packs of 2.

This nozzle is suited for heavy-duty MIG welding applications requiring up to 250 amps of output. It is specifically designed to fit standard gas diffusers used with Tweco Spray Master MIG guns. The recessed bore geometry makes it a strong fit for applications where longer electrical stick-out is needed or where the nozzle may contact the workpiece, such as tack welding, spot welding, and stitch welding. It slides over the metal spring of the gas diffuser without requiring an additional separate insulator, streamlining front-end assembly in production or field welding environments.

Key Features

• 3/8-inch bore recessed nozzle design for up to 250A Tweco Spray Master MIG guns
• 3-piece construction: 122 DHP copper alloy housing, solid brass machined insert, G7 silicone insulator
• Nozzle insert crimped in place to slide over the gas diffuser metal spring — no additional insulator required
• G7 silicone nozzle insulator provides electrical isolation from the gas diffuser
• Part number rolled and stamped on outer surface for fast identification in the field
• Recessed tip geometry suited for tack, spot, and stitch welding where nozzle-to-workpiece contact is possible
• Sold as 2 per pack

Compatibility

Designed for use with Tweco Spray Master MIG guns rated up to 250 amps and fits standard Tweco gas diffusers. Consult the gun manufacturer's front-end parts guide to confirm fitment with specific gun models before ordering.

Installation Notes

Installation and replacement of MIG nozzles should be performed by a qualified welding technician with the welding machine powered down and the gun cable depressurized. Ensure the gas diffuser is free of spatter buildup before threading on the replacement nozzle. Avoid overtightening, as the copper alloy housing can deform and affect gas shielding. Follow the welding equipment manufacturer's front-end maintenance schedule and applicable AWS or shop safety procedures.

Technical Specifications

• Bore Size: 3/8 inch
• Outer Diameter: 0.875 inches
• Nozzle Length: 2.383 inches
• Maximum Amperage: 250A
• Housing Material: 122 DHP Copper Alloy
• Insert Material: Solid Brass
• Insulator Material: G7 Silicone
• Package Dimensions: 2.4 x 0.9 x 0.9 inches
• Weight: 0.13 pounds
• Sold As: 2 per pack
• UPC: 608246337234

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1220-1305