axis of thread
... 基准直径 gauge diameter 螺纹轴线 axis of thread 中径线 pitch line ...
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螺纹安装孔的位置与电装电机轴线成错开对称分布。
Screw hollow and motor spindle are distributed staggered and equally.
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当平行于螺纹构件轴线方向进行测量时，倒角长度应该在1-2全螺纹扣之间。
The length of chamfer shall be between1 and2 complete threads as measured parallel to the axis of the threaded component.
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