What are washers for? A washer is a thin plate with a hole that is normally used to distribute the load of a threaded fastener, such as a screw or nut. Other uses are as a spacer, spring (belleville washer, wave washer), wear pad, preload indicating device, locking device, and to reduce vibration (rubber washer). Washers often have an outer diameter about twice their inner diameter, but this can vary quite widely.

Hardware accessories

Washers are usually metal or plastic. High-quality bolted joints require hardened steel washers to prevent the loss of pre-load due to Brinelling after the torque is applied.

Washers are also important for preventing galvanic corrosion, particularly by insulating steel screws from aluminium surfaces.

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Washers types and uses

  • Plain washers, which spread a load, and prevent damage to the surface being fixed, or provide some sort of insulation such as electrical
  • Spring washers, which have axial flexibility and are used to prevent fastening or loosening due to vibrations
  • Locking washers, which prevent fastening or loosening by preventing unscrewing rotation of the fastening device; locking washers are usually also spring washers.

Washers materials

  • Steel – Carbon steel, spring steel, 304 stainless steel, and 316/316A stainless steel
  • Metal – Copper, brass, aluminium, titanium, iron, bronze, and zinc
  • Alloy – Silicon bronze, Inconel, Monel, and Hastelloy
  • Plastic – Thermoplastics and thermosetting polymers such as polyethylene, PTFE (Teflon)
  • Nylon – Nylon 6, Nylon 66, Nylatron, and Tecamid MDS
  • Specialty – Fibers, ceramics, rubber, felt, leather, bimetals, and mica

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About us

Yuhuang Electronic Technology Co., Ltd. – Manufacturer, supplier and exporter of set screws. Set screw is a type of screw generally used to secure an object within or against another object, normally not using a nut. Our set screws are durable and versatile for any application. Custom design screws are available. Yuhuang is well known for the capabilities to manufacture custom screws. Our highly skilled team will work closely with customers to provide solutions.

Learn more about us

For more information about sems screw from us at www.yhscrew.com, please email us at info@www.yhscrew.com. We look forward to hearing from you.