screw with coarse pitch.
大导程螺杆
coarse pitch multiple thread screw
多头大螺距螺杆
To be used where pitch of coarse thread is too large.
粗牙螺距太大时采用。
Thin nuts with coarse pitch and fine pitch thread and with small widths across flats
带小开口度, 粗牙螺纹和细牙螺纹的扁螺母
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