11401243 - Tweco WS14H-40 Heavy Duty Contact Tip 0.040 (25 Pack)

Technical Overview of Tweco 1140-1243 (WS14H-40)

The Tweco 1140-1243, also referenced as the WS14H-40, is a heavy-duty contact tip engineered for Gas Metal Arc Welding (GMAW) applications utilizing 0.040-inch (1.0mm) electrode wire. As a critical component of the MIG gun front-end assembly, this contact tip is responsible for the final transfer of welding current to the wire. It belongs to the widely utilized 14 Series family of consumables, characterized by its 1/4"-28 UNF threaded base, making it universally compatible with Tweco gas diffusers such as the 51, 52, and 54 series found in Tweco No. 1 through No. 4 guns, as well as the Mini-MIG and WeldSkill gun lines.

The "H" designation in the part number signifies "Heavy Duty." Unlike standard wall tips, the WS14H-40 features a thicker copper alloy wall surrounding the bore. This increased mass serves a dual purpose: it enhances the thermal capacity of the tip, allowing it to withstand higher amperages and duty cycles without softening or deforming, and it provides greater mechanical durability against keyholing (wear at the exit of the bore). The bore itself is precision-machined to a specific tolerance that accommodates 0.040" wire, ensuring optimal electrical contact while minimizing friction that could lead to bird-nesting or erratic feeding.

This product is supplied in a package of 25 units, designed for industrial environments where consumable turnover is expected. The copper alloy construction is optimized for electrical conductivity, ensuring a stable arc and consistent weld bead profile. Users should verify that their drive rolls and liner are also sized for 0.040" wire to maintain a complete and efficient feeding system. The WS14H-40 is an ideal choice for fabricators working with intermediate wire diameters that fall between the standard 0.035" and 0.045" sizes, often found in specific automotive or light structural applications.