A washer is a type of thin disk with a hole, usually in the center. A washer is used to support the load of a threaded fastener. It can also be used as a spacer, spring, wear pad, pre-load indicating device, and also locking device. In taps or valves , it is used to form the seal that shuts off the flow of liquid or gas. There is a type of washer called the reducing washer which is used to connect pipes of different sizes. Washers are available in various sizes and materials and widely used in pipe applications besides the other applications.
Washers are usually made of:
- Stainless steel
- Carbon steel
- Cast iron
- Bronze etc.
How to measure washer?
Following measurements are to be taken for washers:
- Outside diameter
- Inside diameter
As a rule, washers usually have outer diameter (OD) about twice their inside diameter (ID).
- Used as a seal to stop the flow of liquid or gas in pipe.
- Used as inlet devices in pipes.
- Connect pipes of various sizes.
- Can be used as a spring.
- Used as a locking device.
- Prevents galvanic corrosion, especially by insulating steel screws from aluminum surfaces etc.