These British Standards apply to the material,dimensions,and finish of washers generally used for packing purposes in aircraft.The washers are primarily for use with B.A.and B.S.F.bolts.
BS SP 13 to 16:1949 history
1949BS SP 13 to 16:1949+A4:2011 Specification for washers for aircraft purposes. (primarily for packing purposes)
1949BS SP 13 to 16:1949 Specification for washers for aircraft purposes (primarily for packing purposes)