M1337 - Miller M1337 Teflon Neck Liner for .030-.035 Aluminum Wire

Genuine Miller M1337 Teflon Liner for Aluminum Welding

The Miller M1337 Liner is a specialized replacement component designed to facilitate the smooth feeding of aluminum welding wire. Specifically engineered for use with .030-inch to .035-inch wire diameters, this liner is manufactured from high-quality Teflon. Unlike steel liners used for hard wires, Teflon provides a low-friction path that is essential for soft alloys like aluminum (4043 or 5356). This reduced friction prevents the wire from dragging, buckling, or shaving inside the liner, which are common causes of "bird-nesting" and erratic arc performance in MIG welding.

Measuring approximately 8 inches in length, this liner is typically utilized as a "neck liner" or "head tube liner" in Miller Spoolmatic guns and other compatible systems utilizing the Fastip configuration. In spool guns, the wire travel distance is short, but the path through the neck is critical. A worn or contaminated liner in this section can immediately ruin a weld by causing erratic feeding. Replacing the neck liner regularly is a best practice for professional fabricators working with aluminum to ensure the highest quality results.

At Josef Gas, we understand that using genuine Miller parts is key to maintaining the reliability of your welding equipment. The M1337 is built to Miller's exact specifications, ensuring a perfect fit within the gun barrel. Whether you are repairing a Spoolmatic 15, 30A, or a similar XR push-pull system, this liner restores the feed characteristics to factory standards. It is an indispensable consumable for any shop focused on aluminum fabrication, signage, or automotive repair.

Installation is straightforward, fitting directly into the head tube assembly. By maintaining a clean and friction-free path right up to the contact tip, the M1337 helps maintain a stable electrical stick-out and consistent arc length. Ensure your aluminum projects proceed without interruption by keeping spare M1337 liners on hand.