Tweco 1240-1237 Mig Welding Nozzle 3/4 in Bore 450 Amp

Product Description

The TWECO 1240-1237 is a heavy-duty MIG welding nozzle engineered for demanding welding environments up to 450 amps. It features a 3/4-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 for reliable conductivity and heat resistance. A flush contact tip relationship of 0.062 inches positions the contact tip closer to the work piece, making this nozzle well suited for applications requiring shorter electrical stick-out. Installed by welding technicians and fabricators, it is designed for use with standard gas diffusers and is sold in a pack of two.

This nozzle is intended for medium to heavy-duty MIG welding applications requiring consistent gas shielding and extended consumable life. The flush tip configuration is typically selected when shorter electrical stick-out is needed, which can result in tighter arc lengths and brings the tip closer to the work piece. It is appropriate for production welding environments where nozzle identification speed and reliability of front-end components are priorities. The part number is rolled and stamped on the outer surface for quick identification during high-volume service situations.

Key Features

• 3/4-inch bore size compatible with standard gas diffusers
• Rated for welding applications up to 450 amps
• 3-piece design: copper alloy nozzle housing, solid brass machined insert, and silicone nozzle insulator — no additional insulator required
• Nozzle insert crimped in place to slide over the metal spring of the gas diffuser
• Silicone G7 material insulator provides electrical insulation from the gas diffuser
• Part number rolled and stamped on outer surface for fast field identification
• Sold as a pack of two

Compatibility

Designed as a heavy-duty OEM-style replacement nozzle for use with standard MIG gun gas diffusers rated for medium to heavy-duty welding applications up to 450 amps.

Installation Notes

Installation and replacement of MIG welding nozzles should be performed by a qualified welding technician with the welding machine powered down and the gun cool to the touch. Ensure the gas diffuser spring is intact before sliding the nozzle into position. Follow the gun manufacturer's front-end assembly sequence and applicable AWS or shop safety guidelines when servicing consumable components.

Technical Specifications

• Bore Size: 3/4 inch
• Nozzle Length: 3.164 inches
• Outer Diameter: 1.117 inches
• Amperage Rating: 450 amps
• Flush Contact Tip Relationship: 0.062 inches
• Nozzle Housing Material: 122 DHP Copper Alloy
• Nozzle Insert Material: Solid Brass
• Insulator Material: G7 Silicone
• Package Quantity: 2 per pack
• Weight: 0.27 pounds

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1240-1237