ANSI/EIA 540BAAA:1990
Detail Specification: Mechanically Actuated (Zero and Low Insertion Force) Sockets for Pin Grid Array Devices with 2.54 mm * 2.54 mm (0.1" * 0.1") Spacing for Use in Electronic Equipment / Note: revision of ANSI/EIA 540BAAA-1990 * Approved 1996-05-28.