This Sectional Specification relates to the plug-in sockets designed for In-Line electronic packages of assessed quality. The purpose of these sockets is to provide interchangeable devices for use on panel boards@ printed circuit boards@ etc. to mate with microelectronic components. The scope of this sectional defines sockets with the following In-line formats: ASingle In-Line Sockets B. Dual In-Line Sockets C. Quad In-Line Sockets D. Zigzag In-Line (staggered) Sockets OBJECT The object of this Specification is to define: A unified numbering system standardized by the Electronic industries Association (EM). Functional levels and standard test methods and gauges for use in the examination of these sockets. Appropriate reference dimensions of the mating device and board layout to establish intermateability and interchangeability criteria': Test severities and performance requirements prescribed in Detail Specifications referring to this Sectional Specification shall be equal to or greater than those specified herein; degradations are not permitted.