Tweco 1250-1430 Mig Welding Nozzle 3/4 in Bore 25 Series

Product Description

The TWECO 1250-1430 is a 3-piece MIG welding nozzle designed for the Tweco 25 Series (25CT) MIG gun platform. It features a 3/4 inch bore and a tapered nozzle design that provides shielding gas coverage during continuous or heavy-duty MIG welding operations. The nozzle housing is cut and formed from 122 DHP copper alloy tubing for heat resistance and conductivity. The internal insert is machined from solid brass with threaded fitment to match the conductor tube. A G7 silicone nozzle insulator provides electrical isolation without requiring a separate add-on insulator. Licensed welding technicians and fabricators install this nozzle as a consumable replacement on MIG welding guns rated up to 500 amperes.

This nozzle is suited for heavy-duty welding applications where sustained arc performance and reliable gas coverage are required. The 1/8 inch tip recess geometry positions the contact tip slightly behind the nozzle face, which helps protect the tip from spatter and is a common setup for short-circuit and spray transfer processes. The part number is roll-stamped on the outer surface for easy identification in multi-gun shops or high-volume consumable environments. It is sold individually and is a direct replacement consumable for Tweco 25 Series MIG gun assemblies.

Key Features

• Nozzle housing formed from 122 DHP copper alloy tubing for thermal conductivity and durability
• Brass insert machined from solid stock with internal threads matched to the conductor tube
• G7 silicone nozzle insulator provides electrical insulation without a separate insulator component
• Tapered 3-piece design rated for welding applications up to 500 amperes
• 1/8 inch tip recess for contact tip protection in spatter-heavy environments
• Part number roll-stamped on outer surface for fast field identification

Compatibility

Designed as a direct replacement consumable nozzle for Tweco 25 Series and 25CT MIG welding gun assemblies rated up to 500 amperes.

Installation Notes

Installation is performed by welding technicians as part of routine MIG gun consumable maintenance. Power down and de-energize the welding power source before removing or installing nozzle components. Thread the nozzle assembly onto the conductor tube by hand until snug; do not use tools that could damage the brass insert threads or the copper housing. Inspect the G7 silicone insulator for cracking or heat damage at each consumable change interval.

Technical Specifications

• Bore Diameter: 3/4 inch
• Nozzle Length: 2.2 inches
• Tip Recess: 1/8 inch
• Maximum Amperage Rating: 500 amperes
• Nozzle Housing Material: 122 DHP copper alloy
• Insert Material: Solid brass
• Insulator Material: G7 silicone
• Weight: 0.2 pounds
• Package Dimensions: 2.4 x 1.1 x 1.1 inches

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1250-1430