夹紧轴 meaning in English

clamp shaft

Test conditions for numeriaclly controlled turning machines and turning centres - geometric tests for machines with a horizontal workholding spindle
数控立式车床和旋转中心的试验条件.带水平工件夹紧轴的机床的几何试验
Test conditions for numerically controlled turning machines and turning centres - part 1 : geometric tests for machines with a horizontal workholding spindle
数控立式车床和转向中心的试验条件.第1部分:有水平工件夹紧轴的机床的几何试验