Tweco 1260-1657 Mig Nozzle 5/8 Inch Bore 200A Heavy Duty

Product Description

The TWECO 1260-1657 is a heavy-duty coarse-threaded copper MIG welding nozzle designed for use with standard EL series gas diffusers. It features a 5/8 inch (0.625 inch) bore and an overall length of 3.383 inches with a 0.97 inch OD. Rated for welding applications up to 200 amps, this nozzle uses a 3-piece construction — a nozzle housing cut and formed from 122 DHP copper alloy tubing, a solid brass nozzle insert with machined internal threads, and a G7 silicone nozzle insulator that provides electrical isolation from the gas diffuser. The part number is roll-stamped on the exterior for quick identification in the field. Sold in a pack of 2.

This nozzle is suited for medium to heavy-duty MIG welding in both fabrication and maintenance repair environments. The recessed contact tip relationship of 0.125 to 0.156 inches makes it well-suited for higher heat applications where longer electrical stick-out is required, as well as tack, spot, and stitch welding scenarios where the nozzle may contact the work piece. It threads directly onto standard EL series gas diffusers, making it a straightforward drop-in replacement in those torch configurations. The copper and brass construction supports consistent heat dissipation during extended welding cycles.

Key Features

• 5/8 inch bore with 3.383 inch length and 0.97 inch OD for medium to heavy-duty welding up to 200A
• 3-piece design eliminates the need for an additional insulator
• Nozzle housing formed from 122 DHP copper alloy tubing for dimensional stability and efficient heat dissipation
• Solid brass nozzle insert with machined internal threads to match the gas diffuser
• G7 silicone nozzle insulator provides required electrical isolation from the gas diffuser
• Part number roll-stamped on exterior surface for fast field identification
• Threads onto standard EL series gas diffusers

Compatibility

Designed to thread onto standard EL series gas diffusers. Compatible with MIG torch setups requiring a coarse-threaded copper nozzle with a 5/8 inch bore in medium to heavy-duty welding configurations up to 200 amps.

Installation Notes

Installation is performed by qualified welding technicians or maintenance personnel. Disconnect and de-energize the welding system before replacing front-end consumables. Thread the nozzle onto the EL gas diffuser by hand until snug — do not overtighten, as this can damage the brass insert or silicone insulator. Inspect the nozzle insulator for cracking or spatter buildup during routine maintenance, as degraded insulation can cause diffuser arcing and unplanned downtime.

Technical Specifications

• Bore Size: 0.625 inches
• Nozzle Length: 3.383 inches
• Outside Diameter: 0.97 inches
• Current Rating: 200 amps
• Recessed Tip Relationship: 0.125 to 0.156 inches
• Housing Material: 122 DHP copper alloy
• Insert Material: Solid brass
• Insulator Material: G7 silicone
• Thread Type: Coarse thread
• Package Quantity: 2 per pack
• Weight: 0.38 pounds
• UPC: 608246139388

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1260-1657