BS SP 134 to SP 138:1968+A1:2012

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”.