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1 ScopeThis European Standard specifies the characteristics of protective covers for receptacles in the family ofcircular electrical connectors coupled by threaded ring.It applies to the class defined in Table 2.For receptacles associated with these protective covers, see EN 2997-003 to EN 2997-007.2 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 undated references,the latest edition of the referenced document (including any amendments) applies.EN 2997-001, Aerospace series — Connectors, electrical, circular, coupled by threaded ring, fire-resistant ornon 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-resistant ornon fire-resistant, operating temperatures − 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak —Part 002: Specification of performance and contact arrangementsEN 2997-003, Aerospace series — Connectors, electrical, circular, coupled by threaded ring, fire-resistant ornon fire-resistant, operating temperatures − 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak —Part 003: Square flange receptacle — Product standardEN 2997-004, Aerospace series — Connectors, electrical, circular, coupled by threaded ring, fire-resistant ornon fire-resistant, operating temperatures − 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak —Part 004: Jam-nut mounted receptacle — Product standardEN 2997-005, Aerospace series — Connectors, electrical, circular, coupled by threaded ring, fire-resistant ornon fire-resistant, operating temperatures − 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak —Part 005: Hermetic square flange receptacle — Product standardEN 2997-006, Aerospace series — Connectors, electrical, circular, coupled by threaded ring, fire-resistant ornon fire-resistant, operating temperatures − 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak —Part 006: Hermetic jam-nut mounted receptacle — Product standardEN 2997-007, Aerospace series — Connectors, electrical, circular, coupled by threaded ring, fire-resistant ornon fire-resistant, operating temperatures − 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak —Part 007: Hermetic receptacle with round flange attached by welding or brazing — Product standardISO 263, ISO inch screw threads — General plan and selection for screws, bolts and nuts — Diameter range0,06 to 6 in3 Terms and definitionsFor the purposes of this standard, the terms and definitions given in EN 2997-001 apply.

4.2 Material, surface treatmentSee Table 2 and below.Protective cover shell – See Table 2.Chain or rope – Stainless steel Rope shall be insulated, insulation shall withstand 260 °C environment; Chain or rope shall rotate freely on the fastener.Fastener – Stainless steelRing and eyelet – Stainless steel4.3 Main general characteristicsSee EN 2997-002.4.4 Possible combinations of protective covers and connectorsSee EN 2997-002.