How to choose a flat washer or a spring washer for the bolts?

In the process of bolt use, flat washer and spring washer each play an indispensable role, so how to choose?

How to choose a flat washer?

Flat washers are used as a part to prevent bolts and nuts from locking. Flat washers are used where fasteners are used.

How to choose suitable flat washers?

Flat washer is a kind of flat washer, which mainly serves to increase and tighten the contact area between screws and some large equipment.

When using flat washers, it is often suitable for nuts and nuts to cooperate with each other.

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It must have the necessary important characteristics within the most effective sealing time:

1. In the case of a harsh environment, the flat gasket should be sealed. When a certain temperature and pressure are in operation, it is not easy to leak.
2. When the flat gasket is connected to the contact surface, it is necessary to better ensure the sealing performance, just like the good effect.
3. Under the influence of temperature when the flat washer receives pressure, the anti-wrinkle ability should be better, otherwise the screw will be damaged and hard gas leakage will occur.
4. Don’t get infected when using flat washers.
5. The use of flat washers can be easily disassembled. This is the biggest effect of choosing flat washers.
6. Remember to ensure normal use at the relative temperature when using flat washers.

In order to better use flat washers, when choosing flat washers, try to choose flat washers made of anti-rust and anti-corrosion materials.

This not only saves time and effort, but also the effect of flat washers can be played well.

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

1. When choosing flat gasket materials, you should pay attention to the problem of electrochemical corrosion when different metals are in 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.When electrical conductivity is required, copper and copper alloys can be used.
2. The inner diameter of the flat washer should be selected according to the larger value of the thread or screw diameter.The outer diameter of the connected material is soft (such as composite material) or matched with the spring washer. The larger value should be selected.
3. When choosing to place the W washer under the bolt or screw head, in order to avoid interference between the fillet under the head and the washer, a flat washer with a chamfered inner hole can be used.
4. Steel washers should be used for important bolts with larger diameters or in order to increase the ability to resist extrusion.Steel washers should be used for tension bolts or tension-shear composite bolt connections.
5. Special gaskets are used in special requirements. For electrical conductivity, copper gaskets can be used; sealing gaskets with air tightness requirements can be used.

The role of flat washers:

1. Increase the contact area between the screw and the machine.
2. Eliminate the damage to the surface of the machine when the spring pad is unloading the screw.It must be: spring washer + flat washer, the flat washer is next to the surface of the machine, and the spring 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 screws from loosening, the spring pads play a certain amount of buffer protection when stressed. Although flat washers can be used as sacrificial pads.
3. But more often it is used as a supplementary pad or flat pressure pad.

Advantage:

①By increasing the contact area, parts can be protected from damage;

②By increasing the contact area, reducing the pressure between the nut and the device, so as to play a protective role.

Disadvantages:

①The flat washer cannot play the role of earthquake resistance;

②The flat washer does not prevent loosening.

The role of spring washers:

1. The function of the spring washer is that after the nut is tightened, the spring washer gives the nut an elastic force to tighten the nut to make it not easy to fall off.The basic function of the spring is to give a force to the nut after the nut is tightened to increase the friction between the nut and the bolt.
2. Spring washers generally do not need flat washers (except for protecting the surface of the fastener and the mounting surface, consider using flat washers and spring washers).
3. Flat washers are generally used in connecting parts, one of which 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 texture from being crushed.

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Advantage:

①The spring washer has a good anti-loosening effect;

②The spring washer has good seismic effect;

③Low manufacturing cost;

④The installation is very convenient.

Disadvantages:

Spring washers are greatly affected by the material and process.

If the material is not good, the heat treatment is not well grasped, or other processes are not in place, it is easy to crack.

Therefore, you must choose a reliable manufacturer.

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

1. Under normal circumstances, only flat washers can be used when the load is relatively small and the vibration load is not applied.
2. In the case of relatively large load and vibration load, a combination of flat washers and elastic washers must be used.
3. Spring washers are basically not used alone, they are all used in combination.

In the actual use process, due to the different emphasis of flat washers and spring washers, in many occasions they are used in conjunction with each other.

So as to protect the parts, prevent the nut from loosening, and reduce the advantages of vibration, which is great s Choice.