电缆锁头的型号，PG和M都表示直径？有什么区别吗？
推荐回答（2个）
PG是适用电缆直径的一个范围，M是锁头的安装直径，即螺纹的规格。例如PG9/M16*1.5 适用电缆直径是4-8 mm，安装直径是16mm，螺纹规格是直径16mm ，螺距是1.5mm。开孔器选用16-17mm的都可以。
螺纹制式(M) M12x1.5 M16x1.5 M20x1.5 M25x1.5 M32x1.5 M40x1.5 M50x1.5 M63x1.5
螺纹外直径 mm 12 16 20 25 32 40 50 63
开孔直径 mm 12.5 16.5 20.5 25.5 32.5 40.5 50.5 63.5
螺纹制式(PG) PG7 PG9 PG11 PG13.5 PG16 PG21 PG29 PG36 PG42 PG48
螺纹外直径 mm 12.5 15.2 18.6 20.4 22.5 28.3 37 47 54 59.3
开孔直径 mm 12.7 15.4 18.8 20.7 22.8 28.6 37.4 47.5 54.5 59.8
螺纹制式(NPT) 1/4" 3/8" 1/2" 3/4" 1" 1"-1/4 1-1/2 2" 2"-1/2 3" 3"-1/2
螺纹外直径inch 13.616 17.055 21.223 26.568 33.227 41.984 48.053 60.091 72.699 88.608 100.013
开孔直径 mm 14.2 17.6 21.7 27.1 33.7 42.5 48.55 60.5 73.2 89.1 100.5
PG和M都是螺纹制式，但开孔直径不一样。你自己分析吧，希望对你有帮助。
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