本SAE航空航天推荐规程（ARP）定义了流体管接头和螺母的最小交叉六角尺寸。ARP涵盖通常指定的英寸和毫米六边形尺寸。本ARP的目的是定义用圆钢加工的六边形或为便于制造、安装或其他目的而转动的六边形角的最小允许直径。根据SAE AS 1043，符合本ARP的六角圆角不得与安全线软管一起使用。

This SAE Aerospace Recommended Practice (ARP) defines the minimum across hexagon corner dimensions for fluid tube fittings and nuts. The ARP covers commonly specified inch and millimeter hexagon sizes.The purpose of this ARP is to define the minimum allowable diameter of coners for hexagons that are machined from round stock or for hexagon corners that are turned to facilitate manufacutirng, installation, or other purpose. Rounded hex corners in accordance with this ARP shall not be used in conjunction with safety wire hoses per SAE AS 1043.