![]() These washers do wonders for accommodating thermal cycling, but they can't eliminate all the problems resulting from poor workmanship. Most often, you'll find Belleville washers in applications where you have to connect bare, soft aluminum to aluminum or copper, or where you have conditions of high current loading or cycling. This is a common way to use these washers, especially when assembling bus bar. One at the nut end and one at the bolt head end. While you should use a split-ring washer only at the nut end of the connection (normally), you can use Belleville washers in tandem. ![]() The advantage of this washer is that it applies clamping pressure along a continuous arc pattern, instead of concentrating it at one point the way a split-ring lockwasher does. The Belleville is a disk spring that applies pressure to the connection once you clamp down on it with the proper amount of force. Such a device does not meet all locking device requirements, however. That locking device often is a split-ring lockwasher. ![]() The most common is the insertion of a locking device between the rotating part (nut) and the parts being fastened (i.e., bus bars). ![]() To keep bolted connections tight, we can choose from several methods. ![]()
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