内传动 meaning in English

internally-driven

Hexalobular internal driving feature for bolts and screws
螺栓和螺钉的六小叶片内传动结构
It is suited for mirror shining polishing operation of all kinds of grinding machine for example , tape - recording magnetic head , all kinds of bearing pin , driving shaft in a compressor and all kinds of mold working
适合各种研磨机台之镜面抛光研磨作业，例如录音磁头各种轴承插梢压缩几内传动轴及各种模具加工。