1、.尺寸换算1”=25.4mm 注意是尺寸换算,并不是代表螺纹代号可以换算!常见代号)G1/86:一端是基本尺寸(见下对照表)为英制1/8的螺纹接头,另一端为可以接外径为的配管(一般情况是塑料气管,也会有铜管之类的)。)6:一端是公称尺寸为8mm的螺纹接头,另一端为可以接外径为的配管(一般情况是塑料气管,也会有铜管之类的)。上面两个型号里的配管都是公制形式的,即单位是mm,例6,表示管的外径是6mm。其实还有一种英制表示的配管,用1/8或1/8,这样表示管的外径是1/8。圆柱管螺纹基本尺寸 如何知道螺纹的代号是多少?对于M开头的,M8表示螺纹大径是8mm,卡尺一量螺纹的最外面的尺寸,取个整,就是
2、型号。对于G开头的,或者说是对于英制螺纹来说,同样用卡尺量下螺纹的最外面的尺寸,但这个只是大径尺寸(mm),在下表中找多对应的代号。螺纹代号基本尺寸大径mmd螺距Mm p每英寸牙数中径Mm d2=D2小径外螺纹d3G 1/8 1/89.7280.907289.1478.566G 1/4 1/413.1571.3371912.30111.445G 3/8 3/816.6621.3371915.80614.95G 1/2 1/220.9551.8141419.79318.631G 5/8 5/822.9111.8141421.74920.587G 3/4 3/426.4411.8141425.27
3、924.117G 7/8 7/830.2011.8141429.03927.877G 1 133.2492.3091131.7730.291G 1 1/8 1 1/837.8972.3091136.41834.939G 1 1/4 1 1/441.912.3091140.43138.952G 1 3/8 1 3/8 44.3232.3091142.84441.365G 1 1/2 1 1/247.8032.3091146.32444.845G 1 3/4 1 3/453.7462.3091152.26750.788G 2 259.6142.3091158.13556.656G 2 1/4 2
4、1/465.712.3091164.23162.752G 2 1/2 2 1/275.1842.3091173.70572.226G 2 3/4 2 3/481.5342.3091180.05578.576G 3 387.8842.3091186.40584.926G 3 1/4 3 1/493.982.3091192.50191.022G 3 1/2 3 1/2100.332.3091198.35197.372G 3 3/4 3 3/4106.682.30911105.201103.722G 4 4113.032.30911111.55110.072G 4 1/2 4 1/2125.732.30911124.251122.772G 55138.432.30911136.951135.472G 5 1/2 5 1/2151.132.30911149.651148.172G 6 6163.832.30911162.351160.872;.