External use lock washers (also called star washers) have teeth made to bite into the bearing surface. an external tooth lock washer is designed to provide stronger holds than internal-tooth washers as the teeth bite into a larger radius, and are best suited to large screws. a tooth lock washer can leave scratches on their attaching surfaces.
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Railway track bolt with nuts and washer wholesale. a head with no markings is grade 2, one with 3 lines spaced 120 degrees is grade 5, and 6 lines spaced at 60 degree intervals is grade 8. nuts are marked in several different ways—see identification marks for hex and heavy hex nuts below. for other grade and property class specifics, look at these reference charts… hex cap screw specifications
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