This standard covers a range of connectors with 2.54 mm (0.1 in) spacing intended to connect a double sided printed board to another printed board or wires. Two kinds of connector are available: – One-part edge-socket connector. Fixed connector or (female) receptacle is intended to mate with edge board contacts. – Two-part connector. Fixed connector or (female) receptacle is intended to mate with free connector of board-mounted (male) connector. For these two cases, fixed connectors or (female) receptacles are the same. Fixed connectors are available with: – solder terminations for wire, – solder terminations for board up to 3.44 mm (0.135 in), – wrapped terminations. Free connectors are provided with flat solder terminations for double sided board of nominal thickness 1.6 mm (0.063 in). For edge-socket connectors only, polarization and coding are available by means of a device mounted instead of two opposite contacts.