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Square washers are square in shape and may be flat on both sides or flat on one side and beveled on one side. Often used with square head bolts, square washers prevent pull through and provide a larger surface area and greater hold than standard round flat washers.
Double fold self-locking washer Wedge locking washers are generally installed under the nut to prevent the nut from loosening.
DIN 557 - 1994 Square Nuts-Product Grade C JIS B 1163 - 1995
DIN 580 - 2018 Eye bolts are commonly used components in various construction.
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