[国外标准] JIS B2351-1990 液压用螺纹联接油口(G螺纹)
[国外标准] JIS B2351-1-2000 Metallic tube connections for fluid power and general use-Part 1-24°compression fit
[国外标准] JIS B2351-5-2012 油圧空気圧用及び一般用途用金属製管継手－第５部：油圧用ねじ継手