This Standard covers general and dimensional data pertinent to the various types of screw and captive washer assemblies, otherwise known SEMS. SEMS products may include screws, tapping screws, or bolts in sizes No 0 through ‘ in diameters in various grades and materials. The word SEMS is recognlzed in the United States a5 a generic term applicable to screwr and washer assemblies. Also included in this Suandard is Nonmandatory Appendix A ilustrating the relative proportions o plain and conical washer SEMS.
