Tab washers are an additional form of lock washer that features external notches or tabs designed to hold the nut in place in relation to the connecting bolt or stud.
Tabs may be bent or engage into keyways or slots in connected surfaces to provide a positive locking surface.
To fit over M8 Bolt
Actual Inside Diameter 8.4mm
Outside Diameter 17mm
Tab width 8mm
Length of long tab 20mm from Centre of hole to the end
Length of short tab 11mm from Centre of hold to end
Thickness 0.75mm