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Flat washers are thin, flat, round metal discs with a hole in the center, typically used to distribute the load of threaded fasteners such as screws or nuts.

Fasteners are a type of mechanical component widely used for fastening connections. Fasteners are widely used in various industries, including energy, electronics, electrical appliances, machinery, chemical, metallurgical, mold, hydraulic, and more. They can be found in various types of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, instruments, and supplies, and are the most widely used mechanical basic components. Its characteristics are a wide variety of specifications, diverse performance and applications, and a high degree of standardization, serialization, and generalization. Therefore, some people also refer to a type of fastener that already has national standards as standard fasteners, or simply as standard components.

Fasteners typically include the following 12 types of parts: bolts, studs, screws, nuts, self tapping screws, wood screws, washers, retaining rings, rivets, components and connecting pairs, and weld studs.

Fasteners are a type of mechanical component widely used for fastening connections. Various types of fasteners can be seen on various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters, and supplies.