16401323 - Tweco 64H-45 Conductor Tube for MS450 MIG Gun

Heavy-Duty Replacement for Spray Master MS450

The Tweco 1640-1323 (64H-45) Conductor Tube is the OEM replacement neck for the Tweco Spray Master MS450 air-cooled MIG gun. Engineered for the heavy industrial environment, this conductor tube is rated for 450 amps, making it suitable for high-deposition welding using flux-cored or solid wires. The "64H" designation indicates its heavy-duty classification within the Tweco lineup, featuring a substantial copper cross-section that maximizes electrical conductivity and aids in passive heat dissipation—critical factors for maintaining a stable arc during long weld cycles.

Technical Specifications & Fitment:

This specific model features a 45-degree reverse bend, which is the standard configuration for general-purpose fabrication. The geometry is optimized to reduce wire feed friction while allowing the welder to maintain a comfortable torch angle relative to the workpiece. The tube connects directly to the MS450 handle assembly, utilizing Tweco's proven connection design to ensure a rigid mechanical fit and a low-resistance electrical path. The front end of the tube is machined to accept standard Spray Master gas diffusers (such as the 54A) and nozzle assemblies, ensuring you can continue using your existing inventory of consumables.

Durability and Maintenance:

MIG gun necks are subject to harsh conditions, including spatter buildup, radiant heat, and mechanical impact. The 1640-1323 is built with a durable metal alloy core protected by a high-dielectric insulating jacket. This jacket not only prevents short circuits when working in tight spaces but also provides a layer of thermal protection. When replacing the conductor tube, it is recommended to also inspect the liner and diffuser threads to ensure the entire gas and wire path is unobstructed. This part is essential for MRO professionals maintaining a fleet of Tweco equipment, offering a quick and reliable fix for bent or clogged torch necks.

Whether you are running mild steel, stainless, or aluminum, the integrity of the conductor tube directly impacts wire feedability and gas laminar flow. Trust the Tweco 1640-1323 to deliver the consistent parameters your WPS requires.