The main functions of square flat washers include the following aspects:

Increasing friction: Square washers increase the contact area between bolts and nuts, thereby increasing friction and preventing fasteners from loosening on their own.

Disperse pressure: Square flat washers can disperse pressure, reduce compressive stress on the connected parts, and prevent damage to the connected parts due to local stress concentration.

Reduce friction: During the tightening process, square washers can reduce friction, making it easier to tighten bolts and nuts.

Preventing leakage: In situations where sealing is required, square flat gaskets can prevent liquid or gas leakage.

Shock absorption and buffering: Square flat washers have a certain degree of elasticity and can absorb vibrations and impacts, playing a role in shock absorption and buffering.