We're sorry but web site doesn't work properly without javascript enabled. Un,unf,unc;是英寸制统一螺纹的识别 un是英文unified national的缩写，属于统一螺纹的恒定螺距系列。unf是英文unified national fine的缩写，是统一螺纹细牙系列。unc是英文unified. Getsockopt无法连接mcgetsockopt 无法连接 mc 可能是服务器连接超时，connection timed out:
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Uns① 特殊系列的统一螺纹 unr 圆弧牙底恒定螺距系列的统一螺纹 圆弧牙底的unr、unrc、unrf、unref、unrs只用于外螺纹而没有内螺纹 unrc 圆弧牙底粗牙系列统一螺纹.
