WASHER,DIRECT TENSION INDICATING,COMPRESSIBLE
An item round in shape having a centally located hole. It consist of a steel ring with protrusions on one face. When the item is placed under the bolt head or nut end, the protrusions create a gap. As the bolt is tensioned, the clamping force flattens the protrusions reducing the gap. Correct bolt tension is evaluated by observing the remaining gap.