Function introduction of spring washer and flat washer

June 08,2022

Large Bronze Galvanized Dock Chrome Plated Washers

 

Recently, I saw someone on Baidu know asking what is the difference between spring washers and Chrome Plated Washers? Today, I will give you a brief introduction to this situation, hoping to be helpful to you.

 

Spring washers are mainly used to prevent loosening, and flat washers have no loosening function, that is, Large Bronze Washers only increase the contact area, and spring washers can prevent loosening. For example, the bolts connecting the motor and the base generally need spring washers. Without a spring washer, the nut would come loose.

 

Generally, spring washers are installed on fasteners on equipment with vibration, and flat washers are generally not required on flanges. Whether the spring washer is added to the flange is related to the medium circulating in the pipeline. If it is easy to generate pulses, it is best to add a spring washer, as well as high-speed fluid, and the caliber changes frequently. Do not generalize.

 

 

On some valves, spring washers are required for the stuffing box gland flange. All in all, the flat washer is to increase the fastening contact area; the spring washer can be used in places with vibration to prevent loosening; the PVC flange does not need to be added with a spring washer.

 

If you know that the main function of the spring washer is to prevent loosening, what are the specific use conditions of the spring washer? The use conditions of the spring washer are as follows: The application of the spring washer can be applied to the following four standards: standard spring washer (GB93- 1987), light spring washers, (GB859-1987), heavy spring washers (GB7244-1987).

 

The purpose of the spring washer: It is installed under the nut to prevent the nut from loosening. It is stated in the national standard. Hexagonal slotted nuts are specially designed for use with bolts with holes at the end of the screw, so that the cotter pin can be inserted into the hole of the screw from the groove of the nut to prevent the nut from automatically loosening. It is mainly used for vibration loads or alternating loads.

 

Let me give you a simple example to illustrate the actual application of Galvanized Dock Washers: the one on the picture is my first screw assembly, the scientific name is hexagon socket head bolt assembly. This kind of bolt is a common furniture fastening hardware connection.

 

 

And it is a more important fastener, usually used for fixing the legs of the table, for example, the strict hardware connection is usually as shown in the figure below, and the spring washer is used in conjunction with the cross bar nut. Because if there is a gap between the bolts and nuts when they are tightened, the furniture will inevitably shake after a long time of use, which may cause the screws to loosen.

 

In addition, wood will expand and shrink, and the main function of the spring washer is to provide buffer space. In terms of design ideas, the spring washer (also called the spring washer) has a pre-tension, and after being compressed, it rebounds. In actual use, due to the characteristics of the thread, after the nut is tightened, it is easy to rotate in the direction of the thread, resulting in loosening of the nut.

 

In order to solve this problem in the early days, spring washers appeared. Due to the pre-tension of the spring washer, after the nut is pressed against the spring washer, under the action of the pre-tension, the triangular-shaped screw in the nut and the side of the triangular-shaped screw in the bolt are tightly attached together. Under the action, the nut will no longer appear loose.

 

While ordinary washers (also called Galvanized Dock Washers or Chrome Plated Washers
Or Large Bronze Washers), which is a support under the pre-tension of the spring washer, which increases the pressing area of ​​the pre-tension of the spring washer.