35-40-15 - Tweco 35-40-15 MIG Gun Conduit Liner .030-.035 15ft

Tweco 1400-1133 Replacement MIG Liner Specifications

The Tweco 35-40-15 (1400-1133) is a premium replacement conduit designed for use with mild steel and flux-cored welding wires. Engineered to accommodate wire diameters of .030 inches through .035 inches, this liner provides the critical internal guidance system for your MIG gun cable. The liner features a wound spring steel construction that offers the necessary flexibility to navigate the cable's curvature while maintaining enough rigidity to prevent the wire from buckling or bird-nesting inside the gun.

Key Technical Features:

• Wire Compatibility: Optimized for .030" (0.8mm) and .035" (0.9mm) hard wires.
• Length: 15 feet (4.5 meters), suitable for standard 15ft MIG guns.
• Material: Zinc-plated high-carbon spring steel wire.
• Series: Tweco 35 Series Conduit.

Proper liner maintenance is often overlooked but is vital for consistent electrical conductivity and arc stability. Over time, copper flaking from welding wire, shop dust, and debris can accumulate inside the liner, increasing drag. The Tweco 35-40-15 is manufactured with tight tolerances to ensure concentricity, reducing the gap between the wire and the liner wall to prevent micro-arcing while allowing free movement. The zinc coating further enhances performance by reducing the coefficient of friction.

Installation is straightforward. The liner is fed through the back of the gun connector and trimmed to the correct stick-out length at the front end, ensuring it seats firmly against the gas diffuser or head assembly. This specific model is widely used in Tweco No. 1 and No. 2 MIG guns, as well as various "Tweco-style" aftermarket guns found on Lincoln and other welding machines. Always verify your gun's series and cable length before ordering to ensure correct fitment.