ISO 7320-2021 pdf download.Aerospace一Couplings, threaded and sealed, for fluid systems一 Dimensions. This document establishes a system for sealing the port connection of couplings used in the aerospace industry. It specifies dimensions to achieve interchangeability of the port connection, the fitting end and a seal. The seal can be a standard 0-ring or a special ring. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 5855-3, Aerospace — Mj threads — Part 3: Limit dimensions forfittingsforfluid systems 3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www .org/obp — IEC Electropedia: available at http://wwwe1ectropedia.org/ 4 Sealing principle and assembly of the coupling The coupling comprises three elements: a) the port element, including the internal thread (see £1); b) the fitting element, including an external thread and a groove intended to receive the 0-ring (see 5.2) or a special seal; this element is screwed into the internal threaded element; c) the seal element, which maintains system pressure without leakage La standard 0-ring (see 5.3) or special seall. 5 Dimensions 5.1 Port connection See Figure 1 and Table 1.ISO 7320 pdf download.
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