Plain and spring washers are both used to distribute the load of a fastener. The difference lies in their shape. Plain washers are flat, 

Lock washers are designed to be tightened to a required torque beneath an ordinary fastener. They exert a spring tension that keeps the fastener from vibrating 

Curved spring washers must be used in flexible and load-cycling products. It is also employed to absorb movement. 2. Lock Washer This form of lock washer is used to lock the nuts and bolts. These are many forms. Generally, six or more leaves are extended beyond the main diameter of the lock washer.

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Helical spring washers from ITA Fasteners are mostly used to secure the loose components of machines and electrical equipment tightly. With its very high bolt tension per unit of applied torque, the screws protect the equipment from vibrations. It is available in stainless steel, carbon steel, and alloy steel to bear more wear and tear while

The lockwasher serves as a spring whilel the bolt is being tightened. However, the washer is normally flat by the time the bolt is fully torqued. At this time it is equivalent to a solid flat washer, and its locking ability is nonexistent. In summary, a lockwasher of this type is usless for locking. Or the US Navy. Quote:

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Other uses are as a spacer, spring (Belleville washer, wave washer), wear pad, preload indicating device, locking device 

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These washers are frequently used in high-vibration environments to prevent the loosening of the fastener assembly.

Spring washers can be used as a type of lock washer to eliminate rattle or vibration that might unscrew a bolt. These are common in instances where a coil spring would be impractical or too large. Disc springs are common on pipe flanges to combat flange leakage from high temperatures and varying pressure. These small devices are also found in