197440 - Miller 197440 Bulk MIG Liner .187 OD x .110 ID (500 ft)

Technical Specifications and Application for Miller 197440 Bulk Liner

The Miller 197440 is a specialized bulk MIG gun liner delivered in a 500-foot coil, intended for professional welding equipment maintenance and custom fabrication. This liner material is manufactured with a strict tolerance Outer Diameter (OD) of .187 inches and an Inner Diameter (ID) of .110 inches. The .110-inch ID is critical for determining wire compatibility; it is typically sized to accommodate larger diameter welding wires, often in the range of 5/64" (2.0 mm) to 3/32" (2.4 mm), or for applications where a looser fit is desired for 1/16" (1.6 mm) wires to reduce friction in tortuous cable paths. Proper selection of liner ID is essential for preventing micro-arcing inside the liner and ensuring smooth wire delivery to the contact tip.

When utilizing bulk liner material, the technician must ensure proper preparation of the cut ends. Unlike pre-cut liners that may come with factory-crimped fittings or smooth ends, bulk material requires the user to cut the coil to the specific length of the gun cable assembly. It is crucial to deburr and file the cut end to remove any sharp edges that could shave the welding wire or damage the liner collet. This bulk format is compatible with various retention systems, provided the user has the necessary collets, O-rings, or set screws to secure the liner within the power pin and gun head. The steel spiral construction offers excellent flexibility while maintaining the column strength needed to support the wire during push-feeding operations.

Installation and Maintenance Tips:

• Measuring: Always lay the gun cable flat and straight before measuring the required liner length.
• Cutting: Use high-quality side cutters or a dedicated liner cutting tool to prevent flattening the coil.
• Finishing: File the cut face flat and ream the ID slightly to ensure the wire enters smoothly without snagging.
• Blow Out: Periodically use compressed air to clear the liner of shop dust and metal shavings to extend its service life.