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14201125 - Tweco 42-4045-25 Steel MIG Liner .040-.045 25ft

Packaging: pack of 1
$103.39/EA $48.52/pack of 1 only $48.52/EASave 53%

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SKU: TWE1420-1125 Categories: , ,

OVERVIEW

Precision Wire Delivery with Tweco 42 Series Liners

The Tweco 1420-1125 (Part No. 42-4045-25) is a premium steel conduit liner designed to facilitate the smooth transfer of welding wire from the feeder to the contact tip. Engineered specifically for wire diameters between .040" and .045" (1.0mm to 1.2mm), this liner is an essential component for maintaining arc stability and weld quality in industrial MIG applications. The liner features a robust zinc-plated spring steel construction, which serves a dual purpose: it significantly reduces the coefficient of friction between the wire and the liner wall, and it provides essential corrosion resistance to prolong the service life of the consumable.

With a total length of 25 feet (7.6 meters), this conduit is tailored for extended-length MIG gun assemblies, commonly found in large fabrication shops, shipyards, and heavy equipment manufacturing where reach is critical. The 42 Series designation indicates its compatibility with a broad spectrum of Tweco MIG guns, including the industry-standard Spray Master and Professional Series (No. 2 through No. 5). Proper liner selection is critical to preventing wire feeding issues such as bird-nesting, erratic arc starts, and burn-backs. This liner's precise internal diameter ensures that the wire is supported sufficiently to prevent buckling while allowing enough clearance for smooth movement.

Installation of the 42-4045-25 is straightforward, following standard Tweco maintenance procedures. The liner is supplied with ample length to be trimmed to the exact requirement of the specific gun cable assembly, ensuring a perfect fit at the gas diffuser and power pin. Regular inspection and replacement of the conduit liner are recommended as part of a preventative maintenance schedule to minimize downtime and ensure consistent welding parameters.

Additional Information
Brand:Tweco
Item:Liner
Length:25 ft
Wire Size:0.040" - 0.045"
Packaging Description:1 per each
Material:Zinc Plated Spring Steel
Series:42 Series
Part Number:42-4045-25
Compatible Gun Models:Tweco Spray Master, Tweco Professional No. 2, Tweco Professional No. 3, Tweco Professional No. 4, Tweco Professional No. 5

INCLUDED

  • (1) Tweco 42-4045-25 Steel Conduit Liner (25 ft)

APPLICATIONS

  • General Fabrication
  • Heavy Equipment Repair
  • Automotive Manufacturing
  • Shipbuilding
  • Structural Steel Welding
  • Pipeline Welding

FAQ

This liner is designed for wire diameters of .040" to .045" (1.0mm to 1.2mm).

The liner is 25 feet (7.6 meters) long, making it suitable for extended reach MIG guns.

No, this is a steel wound liner. For aluminum wire, you should use a Teflon or polymer liner to prevent shaving the soft aluminum wire.

Replace the liner if you experience erratic wire feeding, arc instability, or if the liner is kinked or clogged with debris.

Yes, it can be used with both solid steel wire and flux-cored wires within the specified diameter range.

Yes, new liners are typically supplied longer than necessary and must be trimmed to the correct length for your specific gun assembly.

It fits most Tweco Professional and Spray Master series guns, including No. 2, 3, 4, and 5 models.

Zinc plating reduces friction for smoother wire feeding and provides corrosion resistance to extend the liner's shelf and service life.