1 Scope
This standard specifies dimensions, tolerances and general requirements for a series
of copper beryllium crinkle washers suitable for use with screwed fasteners ranging
from 0.060 in (Unified No. 0) to 0.750 in nominal diameter. It provides for natural
finish, BS SP 134; cadmium coating, BS SP 135; silver coating, BS SP 136; nickel coating,
BS SP 137; and tin coating, BS SP 138.
NOTE The values stated in British units are to be regarded as the standard and the metric equivalents are approximate. More accurate conversions should be based upon the data in BS 350, “Conversion factors and tables”.