滚丝前的直径需要很高的精度，一般在中经的范围内，取上差或是下差，视情况而定。
滚丝机 [机] thread roller ; thread rolling machine ; screw rolling machine ; rolling machine
螺栓滚丝机 bolt thread rolling machine ; bolt screwing machine
滚丝轮 Thread Rolling Cylindrical Dies ; cylindrical die roll
滚丝模 thread rolling die
滚丝锥 rolled tap
钢筋直螺纹滚丝机 QGL
板式滚丝机 plate type thread rolling machine
自动滚丝机 automatic thread roller
滚丝轮螺纹和钻杆螺纹的螺旋角有误差。
Secondly there is error between the thread roll angles of thread rolling die and drill rod.
钢筋滚丝机；
本发明涉及一种道钉加热传动装置，适用于需要加热滚丝的铁路螺纹道钉的传送加热。
The invention relates to a heating transmission device for spikes, which is applicable to the heating transmission of railway thread spikes needing to heat rolling thread.
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