495348 - Miller .312-24 x 9.25 Grade 5 Hex Washer Head Screw

Precision Fastening for Industrial Welding Equipment

The Miller 495348 is a specialized replacement screw designed to meet the rigorous mechanical demands of Miller welding power sources. Engineered with a .312-24 (5/16-24) Unified Fine thread pitch, this fastener offers superior holding power compared to coarse thread alternatives, making it ideal for applications subject to vibration. The screw features an impressive 9.25-inch length, allowing it to secure deep assemblies, chassis components, or stacked internal elements within the machine's architecture.

Manufactured from SAE Grade 5 steel, this component provides a medium carbon steel composition that has been quenched and tempered for optimal strength. Grade 5 fasteners typically exhibit a proof load of 85,000 psi and a minimum tensile strength of 120,000 psi, ensuring that this screw can withstand significant tension and shear forces without yielding. This is critical in heavy industrial equipment where structural rigidity directly impacts performance and safety.

The head design is a Hex Washer Head (Hwd), which combines a standard hexagonal drive with an integral washer face. This design feature increases the bearing surface area under the head, distributing the clamping load over a wider area. This is particularly beneficial when fastening against softer materials or slotted holes, as it prevents the head from embedding into the mating surface and eliminates the need for a separate flat washer. The screw is finished with a protective plating, likely zinc or a similar conversion coating, which provides essential corrosion resistance against humidity and shop contaminants.

Using genuine OEM hardware like the Miller 495348 ensures that the replacement part meets the exact dimensional tolerances and material specifications intended by the original engineers. Generic fasteners may lack the specific thread quality, grade verification, or plating thickness required for long-term reliability in a welding environment.