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The flat washer is used as a part to prevent the bolt and nut from locking. Where fasteners are used, flat mats will be used. How to choose the appropriate flat mats? The flat washer is a kind of flat washer, which is mainly used to enlarge and tighten the contact area between screws and some large equipment. When the flat washer is used, it is often suitable for nuts and nuts to cooperate with each other. When the flat washer is stored, it must be within the most effective sealing time.

It has the necessary important characteristics:

1. The flat gasket should be sealed in a bad environment. It is not easy to leak when a certain temperature and pressure are in operation.

1. When the flat gasket is connected with the contact surface, it is necessary to better ensure the tightness, just like the just good effect.

1. When the gasket is under pressure, the anti wrinkle ability should be better under the influence of temperature, otherwise the screw will be damaged and hard gas leakage will occur.

1. Do not get infected when using the flat pad.

1. The flat pad can be disassembled well, which is the greatest function of selecting the flat pad.

1. Remember to ensure that the flat pad can be used normally at a relative temperature.

In order to make better use of flat mats, we should try our best to select the flat mats dipped with anti rust and anti-corrosion materials, which not only saves time and effort, but also can play a good role.

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

1. When selecting gasket materials, attention should be paid to the electrochemical corrosion of different metals in contact. The material of the flat pad is generally the same as that of the connected parts, usually steel, alloy steel, stainless steel, aluminum alloy, etc. Copper and copper alloy can be selected when there are conductive requirements.

1. The inner diameter of the flat washer shall be selected according to the larger diameter of the thread or screw rod. The outer diameter of the soft connected material (such as composite material) or matching with the spring washer shall be selected as the larger value.

1. When the w washer is placed on the bolt or screw head, in order to avoid the interference between the fillet under the head and the washer, the flat washer with inner hole chamfer can be selected.

1. Steel washers shall be used for important bolts with large diameter or to increase the anti extrusion capacity. Steel washers shall be used for the connection of tension bolts or tension shear composite bolts.

1. Special gaskets shall be used for special requirements. Copper gaskets can be used for conductive parts; Available sealing gaskets with air tightness requirements.

Function of flat pad:

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

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

1. But most of the time, it is used as a supplementary pad or flat pressing pad.

Advantage:

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

• By increasing the contact area, the pressure between the nut and the equipment is reduced, so as to play a protective role.

Disadvantages:

• The flat washer can not resist earthquake;

• The flat washer also has no locking effect.

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