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.
Factors that are to be considered for washers
are as follows:
- Outside Diameter
- Inside Diameter
Washers are usually made of:
How to measure washer?
- Stainless steel
- Carbon steel
- Cast iron
- Bronze etc.
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).
Uses of washers:
Some uses of washers are as follows:
Types of washers:
- 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.
These washers, also known as split washer,
provide better load distribution and greater tension which in turn
prevent against loosening due to vibration.
Used for a truly non-corrosive assembly.
Adjustable washers in an irregular shape
so that when the washer is loaded it deflects and acts like a
spring, which in turn provide a pre-load between two surfaces.