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hex head wood screws
Diameter range (mm)：M2-M20，1/8-3/4Length range (mm)：3-300，1/2-12'
Flat washer, also known as flat washer, is mainly stamped out of stainless steel plate. It looks like a flat washer with a hole in the middle. This hole size specification model is generally determined according to user needs. Flat washers are generally thin pieces of various shapes to reduce friction, avoid leakage, protect, avoid falling off or disperse working pressure. Such components exist on many materials and structures to perform various similar functions. Limited by the raw materials and processing technology of external thread standard parts, the supporting surface of standard parts such as bolts is not large, so in order to reduce the compressive stress of the pressure-bearing surface and maintain the surface of the connected parts, a sealing ring is selected.
It is generally used for high-risk parts to improve the support surface and cover larger holes to avoid damage to the surface of the parts. Large sealing rings are mostly used for wooden parts. Flat washers are generally used in connectors, one of which is soft and the other is hard and brittle. Its key function is to expand the total contact area, disperse the working pressure, and avoid crushing the material softly.
The part between the connected part and the nut. It is generally a flat metal ring, which is used to ensure that the surface of the connected part will not be scratched by the nut, and to disperse the working pressure of the nut on the connected part.
Flat washers increase the total contact area and avoid friction between the bolt and the casting;
The primary function of the flat washer is to maintain the surface of the connector and avoid scratching the surface of the product when the bolt and nut are tightened. Spring washer is commonly used in the load-bearing and non-stress structures of general machinery and equipment. Its advantages are low cost and convenient installation. , suitable for frequent installation and disassembly.
Spring washers are often called spring washers in the field of screws. Its materials are 304 stainless steel and alloy steel, and carbon steel is also iron. The common spring washer specifications and sizes are M3, M4, M5, M6, M8, M10, M12, M14, M16. This specification is more common.
The basic function of the spring washer is to give a force to the nut after the nut is tightened, expanding the sliding friction between the nut and the bolt! That is to say, it is a protective measure to avoid the loosening of the tightening bolts caused by the vibration of the machinery and equipment in operation.
The tightening principle of the spring washer:
The tightening principle of the spring washer is that after the spring washer is flattened, the spring washer will form a continuous elasticity, so that the flange connection pair between the nut and the bolt always maintains a sliding frictional force, resulting in resistance torque, thereby preventing the nut from loosening. At the same time, the bevels at the interface of the spring washer are respectively inserted into the surface of the bolt and the connected part, thereby preventing the bolt from rotating relative to the connected part.
As everyone knows, practical experience has proved that the spring washer only gives 10N/m of elasticity, and the elasticity of 10N/m can be ignored for the bolt torque of 280N/m. Secondly, such a small force cannot make the bevel at the opening of the spring washer to be inserted into the surface of the bolt and the connected part. After dismantling, there is no significant indentation on the surface of the bolt and the connected parts. Therefore, the tightening effect of the spring washer on the bolt can be ignored.
