ISO 13778:2017规定了轴承的选择性装配（根据ISO 3548-1）。 轴承径向间隙由壳体直径、轴颈直径和两个半轴承的壁厚决定。通常，这些部件的总公差“叠加”为50μm至60μm。当前发动机的发展，尤其是对改进发动机的要求，使得由于公差“叠加”，需要减小间隙范围。本文件提出了各种选择性组装方案，以实现此类范围。

ISO 13778:2017 specifies the selective assembly of bearings (in accordance with ISO 3548？1). The bearing diametral clearance is determined by the housing diameter, journal diameter and the wall thickness of the two half bearings. Typically, these components will have a total tolerance "stack up" of 50 μm to 60 μm. Current engine development and in particular, the desire for improved engine refinement, has provided a need to decrease the clearance range due to the tolerance "stack up". This document suggests various schemes of selective assembly to achieve such ranges.