CSN 25 4056-1986 Screw gauges Minimum and maximum check plugs for solid GO screw ring gauge Cylindrical pipe thread diameter G 1 8 - G 3 1 2《螺纹规 实心穿过型环首螺钉规最小及最大检测插栓 直径为1 8 - G 3 1 .pdf

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