Tweco 1240-1434 Mig Nozzle 3/4 Inch Bore 450A 1.75 Inch

Product Description

The TWECO 1240-1434 is a coarse threaded copper MIG welding nozzle machined from 145 tellurium copper alloy bar stock. It features a 3/4 inch bore, a 1.07 inch outer diameter, and an overall length of 1.75 inches. The 2-piece design includes a separate nozzle insulator that threads onto the conductor tube to provide electrical insulation between the nozzle and the conductor tube. The part number is roll-stamped on the outer surface for quick identification in the field. This nozzle is rated for welding applications up to 450 amps and is sold in a pack of 2. The tellurium copper alloy construction delivers consistent dimensional stability and efficient heat dissipation during sustained high-amperage operation.

This nozzle is intended for medium to heavy duty MIG welding applications where reliable thermal performance is critical. The recessed contact tip relationship of 0.125 to 0.156 inches makes it well suited for higher heat applications that require longer electrical stick-out, or in situations where the nozzle may contact the work piece such as tack, spot, and stitch welding. The nozzle housing and nozzle insulator are sold separately from this nozzle.

Key Features

• Rated up to 450 amps for medium to heavy duty MIG welding
• Machined from 145 tellurium copper alloy bar for consistent dimensional stability and efficient heat dissipation
• 3/4 inch bore with 1.07 inch OD and 1.75 inch overall length
• Recessed tip relationship of 0.125 to 0.156 inches suited for higher heat and longer electrical stick-out
• Part number roll-stamped on the outer surface for fast field identification
• 2-piece design with coarse thread; sold 2 per pack

Compatibility

Designed as an OEM-style replacement coarse threaded nozzle for TWECO 24CT series MIG welding guns requiring a 3/4 inch bore nozzle rated up to 450 amps. Nozzle housing and insulator are sold separately.

Installation Notes

Installation should be performed by a qualified welding technician or MIG gun service professional. Disconnect and de-energize the welding power source before servicing front-end consumables. Thread the nozzle insulator onto the conductor tube first before seating the nozzle; do not overtighten, as copper alloy threads can gall. Inspect the contact tip recess relationship after assembly to confirm the 0.125 to 0.156 inch setback is maintained before resuming welding.

Technical Specifications

• Bore Size: 3/4 inch
• Outer Diameter: 1.07 inches
• Nozzle Length: 1.75 inches
• Contact Tip Recess: 0.125 to 0.156 inches
• Maximum Amperage: 450 A
• Thread Type: Coarse threaded
• Material: 145 tellurium copper alloy
• Design: 2-piece
• Weight: 0.13 pounds
• Sold As: 2 per pack

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1240-1434