Tweco 1220-1311 Slip-on Mig Nozzle 1/2 Inch Bore 250A

Product Description

The TWECO 1220-1311 is a slip-on copper MIG welding nozzle designed for use with 250 A Tweco SprayMaster MIG guns. The nozzle features a 1/2 inch bore and measures 2.273 inches in length with a 0.875 inch outer diameter. It is built as a 3-piece assembly: a nozzle housing cut and formed from 122 DHP copper alloy tubing, a nozzle insert machined from solid brass and crimped in place, and a nozzle insulator constructed from G7 silicone material. The flush contact tip relationship of 0.062 inches suits applications where shorter electrical stick-out is needed. This nozzle is sold in a pack of 2 and is intended for heavy-duty welding service up to 250 amps.

This nozzle is used in heavy-duty MIG welding applications running up to 250 A and is designed for use with standard gas diffusers on Tweco SprayMaster MIG guns. The flush tip configuration is suited for applications where a shorter electrical stick-out is preferred, resulting in a tighter arc length and bringing the contact tip closer to the work piece. The slip-on design allows the nozzle to slide over the metal spring of the gas diffuser for quick changeover in production or field welding environments. The part number is rolled and stamped on the outer surface for easy identification at the consumable rack.

Key Features

• 1/2 inch bore with 0.875 inch OD and 2.273 inch length for standard gas diffuser fitment
• 3-piece design: 122 DHP copper alloy housing, solid brass machined insert, and G7 silicone insulator
• Flush contact tip relationship of 0.062 inches suited for shorter electrical stick-out applications
• Nozzle insert crimped in place to slide over gas diffuser metal spring without additional hardware
• G7 silicone insulator provides required electrical isolation from the gas diffuser without a separate insulator component
• Part number rolled and stamped on outer surface for fast field identification

Compatibility

Designed for use with 250 A Tweco SprayMaster MIG guns with a standard gas diffuser. Flush tip configuration is appropriate for applications requiring shorter electrical stick-out.

Installation Notes

Installation is performed by licensed welding professionals or qualified technicians. Disconnect and de-energize the MIG gun and power source before replacing nozzle consumables. Slide the nozzle onto the gas diffuser spring until fully seated before resuming operation. Inspect the nozzle insulator and insert for wear or spatter buildup at each consumable change interval.

Technical Specifications

• Bore Size: 1/2 inch
• Nozzle Length: 2.273 inches
• Outer Diameter: 0.875 inches
• Amperage Rating: 250 amps
• Contact Tip Relationship: Flush, 0.062 inches
• Housing Material: 122 DHP copper alloy
• Insert Material: Solid brass
• Insulator Material: G7 silicone
• Package Quantity: 2 per pack
• Weight: 0.13 pounds

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1220-1311