ISO 8434-1 2018 Connectors in conformance with this document made of carbon steel shall meet or exceed without leakage the requirements.
From a vacuum of 6,5 kPa (0,065 bar) absolute pressure to the working pressures.
When used at temperatures between −40 °C and +120 °C with petroleum-base hydraulic fluids.
According to different applications and different pressure ratings, there are three series of ISO tube connector, designated by
LL, for extra light-duty,
L, for light-duty, and
S, for heavy-duty.
Table 1 — Working pressures for 24° cone connectors for fluid power and general use