ISO 16031-1规定了航空航天流体系统中使用的英制O形圈的内径、横截面、公差和尺寸识别代码。 ISO 16031-1中规定的尺寸和高精度公差适用于拟用于高压液压流体系统的丁腈和乙丙材料，前提是提供合适的工具。

ISO 16031-1 specifies the inside diameters, cross-sections, tolerances and size identification codes for inch O-rings used in aerospace fluid systems. The dimensions and high precision tolerances specified in ISO 16031-1 are suitable for nitrile and ethylene propylene materials intended for use in high pressure hydraulic fluid systems provided that suitable tooling be available.