The use of a flat washer in combination with a lock washer depends on the specific application and the requirements of the fastening mechanism. Let's understand the purpose and function of each washer type:
Flat Washer: A flat washer is a thin, circular metal disc with a hole in the center. It is used to distribute the load of a threaded fastener (such as a bolt or a screw) over a larger surface area. The flat washer helps prevent damage to the underlying material, provides stability, and reduces the chances of the fastener from loosening.
Lock Washer: A lock washer, also known as a spring washer, is a type of washer designed to prevent fasteners from loosening due to vibrations or other external forces. It typically has a split or bent design that adds tension to the fastener assembly. When the fastener is tightened, the lock washer exerts pressure on the nut or bolt head, creating resistance against rotational forces and minimizing the likelihood of loosening.
In some cases, using a flat washer along with a lock washer can provide additional benefits. The flat washer can serve as a protective barrier between the lock washer and the surface being fastened. This can be particularly useful when the fastener is tightened directly against a delicate material or when there is a need for additional load distribution.
However, it's important to note that in certain applications, the use of both washers may not be necessary or even recommended. For example, some lock washers are designed to work effectively without the need for a flat washer. Additionally, certain fastener designs or specific instructions may advise against using both washers simultaneously.
To make an informed decision, it is recommended to consult the manufacturer's guidelines or relevant engineering specifications for the specific fastener and application you are working with. They will provide the most accurate information on the appropriate washer configuration to ensure optimal performance and safety.