This part of IEC 603 covers a range of two-part connectors with contact arrangements having spacings of 2,54 mm (0,1 in) in both directions. The two-part connector range comprises a fixed (board-mounted) connector containing male contacts and a free connector containing female contacts. They are primarily intended to provide interconnection between printed boards using a basic grid of 2,54 mm (0,1 in) as laid down in IEC 97 and round conductor ribbon cable on 1,27 mm (0,05 in) centreline spacing. The fixed connectors are provided with posts either for solder, press-in or wrapped connections. The free connectors are provided with non-accessible insulation displacement terminations.