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1 ScopeThis European Standard specifies the characteristics of hermetic square flange mounted receptacles inthe family of circular electrical connectors coupled by threaded ring.It applies to the class defined in Table 3.For plugs and protective covers, see EN 2997-008 and EN 2997-009 respectively.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and areindispensable for its application. For dated references, only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including any amendments) applies.EN 2997-001, Aerospace series — Connectors, electrical, circular, coupled by threaded ring, fire-resistantor non fire-resistant, operating temperatures − 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak— Part 001: Technical specificationEN 2997-002, Aerospace series — Connectors, electrical, circular, coupled by threaded ring, fire-resistantor non fire-resistant, operating temperatures − 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak— Part 002: Specification of performance and contact arrangementsEN 2997-008, Aerospace series — Connectors, electrical, circular, coupled by threaded ring, fire-resistantor non fire-resistant, operating temperatures − 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak— Part 008: Plug — Product standardEN 2997-009, Aerospace series — Connectors, electrical, circular, coupled by threaded ring, fire-resistantor non fire-resistant, operating temperatures − 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak— Part 009: Protective cover for receptacle — Product standard3 Terms and definitionsFor the purposes of this document, the terms and definitions given in EN 2997-001 apply.