ISO 8434-1 2018 O-rings for use with DIN tube connectors in accordance with this document shall be made of acrylonitrile-butadiene rubber (NBR) with a hardness of (90 ± 5) IRHD, measured in accordance with ISO 48, and shall conform to the dimensions given in Table 7 and shall meet or exceed the O-ring quality acceptance criteria of ISO 3601-3, grade N. In those cases where the pressure and temperature requirements of this document and/or the hydraulic fluid used in the system differ from those specified in Clause 5 and Table 1, the connector manufacturer shall be consulted to ensure that an appropriate O-ring material is selected.
