Tweco 1240-1236 Heavy-duty Mig Welding Nozzle 5/8 Bore

Product Description

The TWECO 1240-1236 is a heavy-duty MIG welding nozzle engineered for high-amperage welding applications up to 450 amps. It features a 5/8-inch (0.625-inch) bore and measures 3.164 inches in length with a 1.117-inch outer diameter. The nozzle is constructed from 122 DHP copper alloy and uses a three-piece design consisting of a copper alloy tubing housing, a solid brass machined insert, and a G7 silicone insulator. This combination delivers reliable electrical insulation from the gas diffuser without requiring an additional external insulator. Licensed welding technicians and fabrication shops install this nozzle on compatible MIG guns for demanding production and structural welding environments.

This nozzle is suited for medium to heavy-duty welding applications up to 450 amps. It is designed for use with standard gas diffusers and provides a flush contact tip relationship of 0.062 inches, making it appropriate for applications where a shorter electrical stick-out is used, which brings the tip closer to the work piece. Flush-style nozzles are commonly selected for shorter arc lengths in production welding. The nozzle insert is crimped in place, allowing the nozzle to slide over the metal spring of the gas diffuser. Sold in a pack of two units.

Key Features

• Rated for welding applications up to 450 amps
• 5/8-inch bore (0.625 inches) with 3.164-inch length and 1.117-inch outer diameter
• Three-piece design: copper alloy housing, solid brass machined insert, G7 silicone insulator — no additional insulator required
• 122 DHP copper alloy construction for thermal and electrical conductivity
• Flush tip relationship of 0.062 inches for shorter electrical stick-out applications
• Part number rolled and stamped on outer surface for quick field identification
• Sold as 2 per pack

Compatibility

Designed for use with standard gas diffusers on heavy-duty MIG welding guns rated for applications up to 450 amps.

Installation Notes

Installation is performed by qualified welders or welding equipment technicians. Always disconnect and de-energize the welding power source before servicing front-end consumables. Ensure the nozzle insert is fully seated over the gas diffuser spring before resuming operation. Do not overtighten or force the nozzle, as the brass insert and silicone insulator can be damaged by improper assembly.

Technical Specifications

• Bore Size: 0.625 inches
• Nozzle Length: 3.164 inches
• Outer Diameter: 1.117 inches
• Maximum Amperage: 450 amps
• Tip Relationship: Flush, 0.062 inches
• Housing Material: 122 DHP copper alloy
• Insert Material: Solid brass
• Insulator Material: G7 silicone
• Design: 3-piece
• Weight: 0.25 pounds
• Package Quantity: 2 per pack
• UPC: 608246328188

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1240-1236