constant lead screw

... ) large lead ball nuts 大导程滚珠螺母 ) constant lead screw 等导程螺杆(挤塑机) ) screw with coarse pitch 大导程螺杆 ...

... constant hydrostatic head device 静水头调节装置 constant lead screw 等螺距螺杆 constant level device 恒液面装置 ...