the hole in the washer is centered and concentric to the plate

  • A washer is a thin plate that has a concentric hole in the center and is typically used in conjunction with a threaded fastener in order to more evenly distribute the load. To provide additional protection, a washer can be inserted through the end of a threaded fastener (like a screw) before the fastener is used to secure something to a surface.

    This prevents the bolt head and the nut from scratching or denting the surfaces of the two parts that are being fastened, which would eventually lead to the fastener becoming less secure. In addition, driving a screw into wood can cause the surface of the wood to crack, but using a washer can help prevent this from happening.

    There is a wide variety of washers available on the market to meet the requirements of a variety of applications. As an illustration, vibration-isolating washers are purposely constructed to dampen vibrations. These parts are fabricated from a pliable substance such as plastic or urethane, for example. On occasion, metal custom washers manufacturer will also serve the purpose of spacers in order to increase the distance that exists between the components that are being fastened.

    The flat washer and the spring washer are two of the most common types of washers. Let's go through each of them again.

    Washers that are flat

    Flat washers are used to increase the size of the bearing surface area of a screw, which in turn reduces the amount of surface pressure that is applied to whatever is being fastened.

    When the bearing surface sinks as a result of the surface pressure, looseness can occur; however, the use of a flat washer significantly reduces the likelihood that this effect will take place. This is of the utmost importance when the contact area between the bearing surface of a screw and the object being fastened is small, or when the object being fastened is made of a soft material such as aluminum or resin.

    As a result of the pressing process that is typically used to make flat washers, one side of the washer has rounded corners while the other side has burrs. Although there is no hard and fast rule that dictates which side should be placed up or down, it is generally best to position the burred side so that it is facing down. This is especially important when bearing surface pressure is a concern.

    However, these burrs can also leave marks on the surface of the object being fastened while the object is being tightened. Because of this, it may be preferable to place the rounded side down for certain applications in order to prevent plate peeling.

    Washers with springs

    To make a spring washer (also known as a locking washer), a portion of a flat washer is removed so that the remaining portion can be twisted into the desired shape. As a consequence of this, either a spring action or an elastic force is put into play. To form a bond, spring washers are only used on the nut side of the fastener. This is in contrast to flat washers, which are attached to the fastener on both the bolt and the nut side.

    At first, it was believed that the increased frictional force provided by the cut part of these washers, which "bites" into the bearing surface, made them effective against loosening. In theory, the sharp edges of the washer (which are also sometimes serrated) dig into the nut and the mounting surface, preventing the nut from rotating counterclockwise or becoming loose. Because of this, these components would be perfect for use in machinery that experiences a lot of vibration.

    Unfortunately, this locking effect caused by "biting" is only applicable in situations in which the material of the object being fastened is softer than the material of the metal washer. When compared to the axial force that is being applied by the screw, the elastic force that is being applied by the spring washer is practically insignificant. Therefore, by the time the elastic force of a spring washer begins to take effect, the screw will already be in a state in which it can be loosened.

    Additionally, the sharp hold that spring washers typically leave behind scratches the bearing surface, which is not ideal for repeated installation or removal of components. There are examples of using spring custom washers supplier in conjunction with flat custom washers manufacturer in an effort to protect the bearing surface from being damaged. These examples are not uncommon. However, this strategy is rarely successful, and the end result is a locking effect that is negligible at best.

    In most cases, Custom washers supplier are used to distribute the load that is being applied to a fastener in order to reduce the amount of friction and loosening that occurs. However, regardless of which washer is selected, applying the correct amount of torque when tightening is the most effective way to guarantee a secure hold and a risk-free application.


    Eccentric lock  can be combined with commercially available hex nuts to prevent screw loosening as an alternative to conventional spring or lock washers. This combination is available for purchase. The fastening of these washers does not require any specialized tools. This indicates that using them is just as simple as using flat washers or spring washers.

    In terms of their construction, these components are made up of a bearing washer as well as an eccentric washer. When a bearing washer is added to a commercially available hex nut, it transforms into a nut that is resistant to loosening when an eccentric washer is inserted into the bolt.