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The bolt strength is high and the compressive stress of the connected parts is relatively low, adding flat washers can reduce the compressive stress on the bearing surface of the connected parts. In order to ensure that the bolt holes between the two connections can correspond one to the other, we need to increase the diameter of the holes to compensate for the deviation in the position of the holes, the bolt holes exceed the standard requirements when you need to increase the flat washers.
 

The head of a hexagonal flange bolt consists of two parts: the hexagonal head and the flange surface. The ratio of the bearing area to the stress area is greater than that of a normal hexagonal head bolt, so this bolt can withstand higher preload and has better loosening resistance, and is therefore widely used in automobile engines and heavy machinery.
 

Tapered washers are used to protect the surface of the connected parts from nut abrasion and disperse the pressure of the nut on the connected parts.

Spherical washers must be used with tapered washers, with automatic positioning role, so that the nut support surface and the screw to maintain a vertical state, to avoid the screw bending, mostly used in the workpiece.

The external teeth serrated locking washer is widely used in the machinery industry as a joint fastener, which is usually used in the joint part when the bolt head and nut are connected.

The external teeth locking washer is widely used in the machinery industry as a joint fastener, which is usually used in the joint part when the bolt head and nut are connected.

Spring washers are widely used in the frequently disassembled connected parts, relying on its elasticity and bevel friction effect, can prevent the nut back loose, because of its uniform elasticity.

Plain washer placed between the nut or bolt, screw head and the surface of the connected parts, used to protect the surface of the connected parts to avoid abrasion by the nut, increase the contact area between the connected parts and the nut, reduce the unit pressure acting on the surface of the connected parts.

Small washer placed between the nut or bolt, screw head and the surface of the connected parts, used to protect the surface of the connected parts to avoid abrasion by the nut, increase the contact area between the connected parts and the nut, reduce the unit pressure acting on the surface of the connected parts.