基本偏差 meaning in English

basic deviation
fundamental deviation

Fundamental deviations and tolerance zones for wood working and wood processing
木材加工和处理的基本偏差和公差范围
Limits and fits - bases - part 3 : numerical values tables of standard toleranes and fundamental deviations
极限与配合.基础.第3部分:标准公差和基本偏差.数值表
Tolerances and fits for large - size of large electrical machines and hydraulic turbines . general standard tolerances and fundamental deviations
大电机水轮机大尺寸公差与配合.总论.标准公差与基本偏差