When bolt size are M27 and less, metric coarse screw threads shall be used.
如果螺栓尺寸为M 27或以下，使用公制粗牙螺纹。
When bolt size are M30 and over, metric fine screw threads of 3 mm pitch series shall be used.
如果螺栓尺寸为m 30或以上，公制螺纹螺旋间距应为3mm。
When bolt size are M30 and over, metric fine screw threads of 3 mm pitch series shall be used.
如果螺栓尺寸为m 30或以上，公制螺纹螺旋间距应为3mm。
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