This specification covers four series of miniature, high density, circular, environment resistant electrical connectors with removable crimp contacts, or hermetically sealed electrical connectors with fixed, nonremovable contacts. Both environment resistant and hermetically sealed connectors are available with bayonet, threaded, or breech-coupled mating systems. Connectors are capable of operating within a temperature range of -65°C to +200°C maximum, or as specified herein (see 1.4). See 6.1 for intended use, application notes, application restrictions and derating factors.