995951 - ESAB Tweco ST21 Jumper Liner for .045-1/16 Wire

Precision Wire Delivery for Industrial MIG Systems

The ESAB 995951 Liner ST21 Jumper H 045-1/16 is a critical component designed to maintain the operational integrity of ST21 series MIG guns. In high-volume industrial welding, the consistency of wire feeding is paramount to achieving sound metallurgical bonds and aesthetic bead profiles. This specific jumper liner is engineered to bridge the wire path through the torch neck, a region often subjected to high thermal stress and mechanical curvature.

Designed to accommodate medium-to-heavy wire diameters ranging from 0.045 inches to 1/16 inches (approximately 1.2mm to 1.6mm), this liner reduces the coefficient of friction as the wire transitions from the main cable liner to the contact tip. By maintaining a concentric path, it minimizes the risk of micro-arcing within the neck and prevents the shaving of wire coatings, which can lead to liner clogging and erratic arc characteristics.

Regular maintenance of the wire feeding path is essential for quality assurance in welding operations. The jumper liner is often the most wear-prone section due to the bend radius of the gun neck. Replacing this component with a genuine ESAB/Tweco part ensures that tolerances are maintained, gas flow remains unobstructed, and the electrical transfer efficiency at the contact tip is optimized. This part is specifically manufactured to withstand the rigors of heavy-duty fabrication environments.

Key Technical Benefits:

• Optimized Internal Diameter: Strictly calibrated for .045-1/16" wires to prevent buckling while allowing smooth passage.
• Thermal Resistance: Constructed from high-grade materials to resist deformation under high-amperage heat.
• System Compatibility: Direct fit for ST21 platforms, ensuring zero gas leakage or misalignment.