ISO 104:2015规定了平底单向和双向止推轴承的首选边界尺寸。 此外，它给出了尺寸系列11、12、13、14、22、23和24中轴承座垫圈的最小孔径和轴承轴垫圈的最大外径。 本单向推力轴承国际标准的扩展指南见附录A。 注:ISO 20516给出了对齐推力轴承（无平背面）和对齐阀座垫圈的边界尺寸。[2]

ISO 104:2015 specifies preferred boundary dimensions for single-direction and double-direction thrust bearings with flat back faces. In addition, it gives the minimum bore diameters of housing washers and maximum outside diameters of shaft washers of bearings in dimension series 11, 12, 13, 14, 22, 23 and 24. Guidelines for the extension of this International Standard for single-direction thrust bearings are given in Annex A. NOTE Boundary dimensions for aligning thrust bearings (none flat back faces) and aligning seat washers are given in ISO 20516.[2]