The Tweco 34A (1340-1125) Nozzle Insulator is a critical component designed for heavy-duty MIG welding applications. Manufactured by Tweco, this OEM part ensures precise compatibility and superior performance compared to aftermarket alternatives. It is engineered specifically for use with Tweco No. 3 (300 Amp) and Tweco No. 4 (400 Amp) MIG guns, as well as compatible systems such as the Lincoln Magnum 300 and 400 series and the Tweco WeldSkill line.
Constructed from high-grade, heat-resistant fiberglass composite material, the 34A insulator is built to withstand the extreme thermal cycling and spatter accumulation typical of industrial welding environments. Its primary function is to provide electrical isolation between the electrically live contact tip/gas diffuser assembly and the outer gas nozzle. Failure of this component can lead to nozzle arcing, irregular gas coverage, and potential damage to the workpiece or welding equipment. The 34A insulator features precision molding that ensures a tight, secure fit onto the gas diffuser (such as the Tweco 52 or 54 series), providing a stable mounting platform for slip-on or thread-on nozzles.
In industrial fabrication settings, maintaining the integrity of the MIG gun's front-end consumables is essential for consistent weld quality. The Tweco 34A insulator offers excellent dielectric strength and mechanical durability, reducing the frequency of replacements and downtime. Whether you are operating a manual MIG setup or an automated system using Tweco-style torches, this genuine insulator guarantees the fit and function intended by the manufacturer.
| Additional Information |
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| Brand:Tweco |
| Item:Insulator |
| Amperage:300 A, 400 A |
| Packaging Description:1 per each |
| Weld Process:MIG (GMAW) |
| Part Number:34A, 1340-1125 |
| Compatible Series:Tweco No. 3, Tweco No. 4, Lincoln Magnum 300, Lincoln Magnum 400, WeldSkill |
| Material:High-Temperature Fiberglass Composite |
| Component Type:Nozzle Insulator |
