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Functional springs
Flat springs
Flat sheet goods, retaining rings, and coil springs
Washers
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Washers
 
Spring washers
Use / Used for locking all types of screw fasteners, including in automobiles.
Function / Prevent screws loosening with a reactive spring force and by biting into the mating surfaces of the fasteners.
 
Waved spring washers
Use / Used for locking all types of screw fasteners.
Function / Lightweight with a strong reactive force, when compared with spring washers. When tightened, they seldom damage the other bearing surface. When loosened, continues to hold by biting.
 
Plain washers
Use /

Plain washers are used for the high torque bolts found in the underbody of automobiles.

Function / Reduce the pressure on the bearing surface and prevent screws loosening due to the bearing surface collapsing.
 
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