11401213 - Tweco 11AH-3/64 Aluminum Contact Tip (Pack of 25)

Tweco 11AH-3/64 Contact Tip Overview

The Tweco 11AH-3/64 Contact Tip (Part Number: 1140-1213) is a specialized consumable designed for use with 3/64-inch (1.2mm) aluminum welding wire. As part of the industry-standard Tweco 11 Series, this contact tip is engineered to fit a broad spectrum of MIG guns, including the Tweco Classic Number 1, 2, 3, and 4 series, as well as Spray Master and Mini MIG guns. The "AH" designation in the model number indicates that this tip is specifically manufactured for aluminum applications, featuring internal tolerances that accommodate the unique thermal expansion properties of aluminum wire.

Manufactured from high-quality copper alloy, these contact tips provide excellent electrical conductivity and thermal transfer, which are critical for maintaining a stable arc during the MIG welding process. The tip features a standard 1/4"-28 UNF thread, ensuring compatibility with standard gas diffusers found in Tweco-style front-end assemblies. This package contains 25 contact tips, making it an ideal stock item for industrial fabrication shops and manufacturing facilities that process significant volumes of aluminum.

Proper contact tip selection is vital for equipment longevity and weld quality. Using a standard steel tip for aluminum wire can often lead to feeding issues as the soft wire expands and binds inside the tighter bore. The 11AH-3/64 addresses this by offering a slightly oversized bore relative to the wire diameter, ensuring smooth feeding while maintaining sufficient electrical contact for consistent arc initiation and stability.