Spring washer, Ø 6.1/11.8 x 3.2 mm, DIN 127 for M6
Spring washers to DIN 127 secure bolts and nuts against self-loosening caused by vibration. They are placed directly under the bolt head or the nut.
The washer size depends on the thread diameter of the bolt; the inside diameter is always slightly larger than the nominal size. Washers that have been flattened or bent open no longer have any spring effect and are replaced on disassembly.
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