M1425 - Miller .030-.035 Teflon Neck Liner for HD AP Fastip

Technical Overview of the Miller M1425 Teflon Liner

The Miller M1425 is a specialized replacement liner designed for specific MIG welding gun configurations, particularly those utilizing the HD AP (Heavy Duty All Purpose) and Fastip systems. This liner is constructed from high-quality Teflon (PTFE), a material chosen for its exceptionally low coefficient of friction. In industrial welding applications, particularly when feeding soft filler metals like aluminum, standard steel liners can cause significant issues such as wire shaving, micro-arcing, and erratic feeding. The Teflon composition of the M1425 mitigates these risks by providing a smooth, non-abrasive channel for the wire to travel through.

This specific liner is rated for wire diameters ranging from .030 inches to .035 inches (0.8 mm to 0.9 mm). The designation "6In" indicates that this is likely a neck liner (also known as a jump liner), installed in the gooseneck of the welding gun rather than running the full length of the cable assembly. Neck liners are critical wear items in push-pull systems and standard guns welding aluminum, as the bend in the neck creates the highest friction point. By using a dedicated Teflon liner in this section, operators ensure consistent wire delivery to the contact tip, maintaining arc stability and weld quality. As a genuine Miller OEM component, it ensures precise dimensional tolerances for seamless integration with compatible Miller equipment.