iron thumb nut是什么意思

用法例句

The real-time examination system is designed and developed on the basis of the old-fashion nut-fastening machine.

此实时检测系统是在原有的螺母拧紧机系统基础上设计、开发出来的,可以在拧紧过程中实时显示主轴拧紧力矩和主动齿轮总成的轴承预紧造成的轴承座阻力矩,根据这两个扭矩值,可以判定调整垫片的选垫厚度是否合适。