SI-3545-17PT - Insulated Steel MIG Liner for .035-.045 Wire, 17 ft Length

Precision Wire Feeding for Professional Fabrication

The SI-3545-17PT Insulated Steel Liner is a critical component for maintaining the efficiency and reliability of your MIG welding setup. Designed specifically for Binzel-style MIG guns, this liner is engineered to handle steel welding wires ranging from 0.035 inches to 0.045 inches in diameter. The liner acts as the conduit for the welding wire, guiding it from the wire feeder through the cable assembly to the contact tip. A compromised or worn liner is a leading cause of erratic arc performance, wire chatter, and the frustrating "bird-nesting" that can halt production.

Constructed from high-tensile steel wound in a precise spiral, this liner provides the necessary rigidity to prevent kinking while remaining flexible enough to maneuver around the shop floor. The "Insulated" designation refers to the protective outer coating that surrounds the steel coil. This insulation serves two vital purposes: it prevents the shielding gas from escaping through the coil before reaching the nozzle, and it electrically isolates the wire from the gun's cable assembly, preventing potential internal arcing that could damage the torch.

With a total length of 17 feet, this liner is suitable for standard 15-foot guns with extra length to spare for proper trimming and fitting. Proper installation is key to performance; the liner must be cut to the exact length required by the specific gun model to ensure the wire is supported all the way to the diffuser. Whether you are welding mild steel in a manufacturing plant or performing repairs in an automotive shop, this replacement liner restores the smooth, consistent wire feed necessary for high-quality welds.

Technical Compatibility

This liner is compatible with a wide range of MIG guns that utilize the Binzel-style back-end and front-end configurations. It is optimized for hard wires (solid steel) and flux-cored wires within the specified diameter range. Regular inspection and replacement of the liner are recommended as part of a preventative maintenance schedule to minimize downtime.