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TYPICAL installation is screw , materials, flat washer , lock washer , nut. But for some reason, the engineer requires the assembly be in the order of screw , lock washer , flat washer , materials, nut. And that is the sequence you should follow. There are materials types and clearances, I presume, makes the engineer require this order. Popular Applications for Screw Washers . Fine Material Screw Washers can be used for washing most any hard ore, rock, stone or sand being minus 10mm or less having a specific gravity of 2.5 or higher and having water soluble clays or silts that need removed. Buy today - ships today. Over 2.1 million appliance parts in stock. Original, high quality Washer Screws , Nuts, Washers parts with fast shipping and award winning customer service.

Washer Head Screws Tapping, Wood, and Drywall Screws While other screws and bolts require holes with threads, tapping screws create their own threads. A lock washer will be used with the part of the assembly that most likely could turn such as the nut. It could be used under the bolt head in instances where the bolt screws into threads in one part of the assembly. A washer is sometimes used to protect the surface of the assembled parts. Uses and Materials Nuts are used to secure a bolt or screw and washers distribute pressure, relieve friction and prevent leaks. Both nuts and washers can be made from an …

A washer is a thin plate (typically disk-shaped) with a hole (typically in the middle) that is normally used to distribute the load of a threaded fastener, . Washers are also important for preventing galvanic corrosion, particularly by insulating steel screws from aluminium surfaces.