21751 - ESAB MT140 Replacement Liner .045 12ft Gray

Technical Overview of the ESAB 21751 Liner

The ESAB 21751 is a specialized replacement liner designed for the MT140 series of MIG welding guns. Engineered to precise industrial standards, this liner serves as the critical conduit for guiding welding wire from the wire feeder through the torch cable to the contact tip. It is manufactured with a specific internal diameter to accommodate 0.045-inch (1.2 mm) welding wires, ensuring optimal clearance that minimizes friction while preventing wire buckling inside the cable.

This liner features a 12-foot length, making it suitable for standard 10 to 12-foot torch assemblies. The construction utilizes high-tensile steel winding, which provides the necessary flexibility to navigate the curvature of the torch cable without collapsing or kinking. The external jacket is color-coded gray, adhering to industry-standard identification practices for .045" wire compatibility, allowing maintenance personnel to quickly verify the correct part during changeovers.

Proper liner maintenance is essential for arc stability. Over time, liners accumulate metal shavings, lubricant debris, and shop dust, which increases the drag coefficient on the wire. This liner is designed to restore factory-level performance to the MT140 system. It is supplied as a single unit, ready for trimming and installation at the backend or frontend depending on the specific gun configuration.