Should Bolts Be Fixed with Flat Washers Or Spring Washers? How Should We Choose?

In the process of bolt use, flat washers and spring washers each play an indispensable role, so how should we choose? Let's talk about it today.

Flat washers

How to choose flat washers? Flat washers are used as a part to prevent bolts and nuts from locking. Flat washers are used wherever fasteners are used. How to choose suitable flat washers? Flat washers are a type of flat washers. They mainly increase the contact area between screws and some large equipment and tighten them. When using flat washers, they are often suitable for nuts and nuts to cooperate with each other. When storing flat washers, they must be sealed in the most effective sealing time. They have the necessary important characteristics:

1. In harsh environments, flat washers should be sealed. When a certain temperature and pressure are in working time, it is not easy to leak.

2. When the flat washer is connected to the contact surface, the sealing should be better guaranteed, just like the effect of just right.

3. When the gasket is under pressure, under the influence of temperature, the wrinkle resistance should be better, otherwise the screws will be damaged and hard gas leakage will occur.

4. Do not be infected when using flat washers.

5. Using flat washers can be disassembled well. This is the biggest role of choosing flat washers.

6. Remember to ensure normal use at a relative temperature when using flat washers.

In order to better use the flat gasket, when choosing the flat gasket, try to choose the flat gasket that is dipped in rust-proof and corrosion-proof materials. This not only saves time and effort, but also allows the flat gasket to play its role best.

When used with bolts and nuts, the selection criteria for flat washers are as follows:

1. When selecting washers, attention should be paid to the electrochemical corrosion problem when different metals come into contact. The material of the flat washer is generally the same as that of the connected parts, usually steel, alloy steel, stainless steel, aluminum alloy, etc. Copper and copper alloys can be used when conductivity is required.

2. The inner diameter of the flat washer is selected according to the larger value of the thread or screw diameter. The outer diameter should be selected to be larger when the connected material is softer (such as composite materials) or when it is matched with spring washers.

3. When placing a W washer under the bolt or screw head, a flat washer with an inner hole chamfer can be used to avoid interference between the fillet under the head and the washer.

4. For important bolts with larger diameters or to increase the anti-extrusion capacity, steel washers should be used. Steel washers should be used for tension bolts or tension-shear composite bolt connections.

5. Special washers are used in special parts. For example, copper washers can be used for conductivity; sealing washers can be used for airtightness requirements.

Functions of flat washers:

1. Increase the contact area between the screw and the machine.

2. Eliminate the damage to the machine surface caused by the spring washer when removing the screw. When using, it must be: spring washer-flat washer, the flat washer is next to the machine surface, and the spring washer is between the flat washer and the nut. The flat washer is to increase the force surface of the screw. In order to prevent the screw from loosening, the spring washer plays a certain amount of buffering protection when it is stressed. Although the flat washer can be used as a sacrificial pad.

3. But more often it is used as a supplementary pad or flat pressure pad.

Advantages:

① By increasing the contact area, it can protect parts from damage;

② By increasing the contact area, it reduces the pressure between the nut and the equipment, thereby playing a protective role.

Disadvantages:

① Flat washers cannot play a role in shock resistance;

② Flat washers also have no anti-loosening effect.

Spring washer

The function of spring washer

1. After tightening the nut, the spring washer gives the nut an elastic force to tighten the nut and prevent it from falling off. The basic function of the spring is to give the nut a force after tightening the nut to increase the friction between the nut and the bolt.

2. Spring washers are generally not used instead of flat washers (except when it is necessary to protect the surface of the fastener and the mounting surface).

3. Flat washers are generally used in connectors. One is soft and the other is hard and brittle. Its main function is to increase the contact area, disperse the pressure, and prevent the soft one from being crushed.

Advantages:

① Spring washers have good anti-loosening effect;

② Spring washers have good anti-seismic effect;

③ Low manufacturing cost;

④ Easy to install.

Disadvantages:

Spring washers are greatly affected by materials and processes. If the material is not good, the heat treatment is not well controlled, or other processes are not done well, it is easy to crack. Therefore, you must choose a reliable manufacturer.

When to use flat washers and when to use spring washers?

1. Generally, only flat washers can be used when the load is relatively small and there is no vibration load.

2. When the load is relatively large and there is a vibration load, a combination of flat washers and spring washers must be used.

3. Spring washers are basically not used alone, but are used in combination.

In actual use, due to the different emphasis of flat washers and spring washers, in many occasions the two are used together to cooperate with each other, which can protect parts, prevent nuts from loosening, and reduce vibration at the same time, and is a great choice.