International Organization for Standardization (ISO)
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ISO 5887:1981
Scope
Gives joint lock dimensions for connecting these masks to sources in aircraft and helicopters. Joint dimensions standardization provides interchangeability with masks of various types. The basic dimensions and tolerances are shown in figures 1 and 2. Dimensions without tolerances can correspond to national standards. The lock halves shall be installed as shown in figures 1 and 2.
ISO 5887:1981 history
1981ISO 5887:1981 Aircraft; Joints for connecting crew members' regulator masks to oxygen sources