11401204 - Tweco 14H Series Heavy Duty Contact Tip .045 25-Pack

Technical Overview of Tweco 14H-45 Contact Tips

The Tweco 14H-45 Contact Tip is a standard consumable component designed for heavy-duty MIG welding applications. Engineered to fit Tweco No. 2, No. 3, and No. 4 MIG guns, as well as the RADNOR Pro 250 and RADNOR 400 series, this tip is a critical element in the electrical circuit of the welding arc. The "14H" designation indicates a heavy-duty profile with a length of 1.47 inches (37.3 mm) and an outside diameter of 0.283 inches (7.2 mm). This specific model is bored to accommodate 0.045-inch (1.2 mm) welding wire, featuring a nominal inside diameter of 0.054 inches with a strict tolerance of +/- 0.003 inches. This precision machining ensures optimal wire feeding and electrical contact.

Manufactured from extruded or gun-drilled 122 DHP (Deoxidized High Phosphorus) copper alloy, the 14H-45 tip exhibits excellent thermal and electrical conductivity. The material choice is deliberate to withstand the high heat environments of welding up to 400 Amps. The tip features a standard 1/4"-28 UNF-2A thread size, allowing for a secure mechanical connection to the gas diffuser. This threaded interface is crucial for maintaining the gas seal and ensuring efficient current transfer from the diffuser to the tip and ultimately to the wire. The thick-walled design of the 14H series serves as an effective heat sink, conducting thermal energy away from the arc source to prevent overheating and premature failure.

These contact tips are supplied in a package of 25 units, facilitating inventory management for high-volume fabrication environments. The part number and wire diameter are stamped directly onto each tip for immediate identification, reducing the risk of installation errors. By maintaining tight tolerances on the inside diameter, Tweco ensures a smooth surface that minimizes friction and micro-arcing inside the tip, which are common causes of burn-back and erratic arc performance.