GB5796.1-86Z=0.25P=H1/2:d2=D2=d-2Z=d-0.5P,dg=d-2h3=d-2(0.5P+ac),5=0.26795es,es一外螺纹中径基本偏差：D1=d-2H=d-P:Di=d+2acRimax=0.5ac1R2mx=ac2.2最大实体牙型尺寸列于表2。表2最大实体牙型尺寸mm螺距RR2H=hsPmaxmax1.50.150.90.0750.1520.251.250.1250.2530.251.750.1250.250.252.250.1250.2550.252.750.1250.250.53.50.250.50.540.250.50.54.50.250.50.550.250.5100.55.50.250.5120.56.50.250.514180.51公90.5181100.5120以0.51221120.51241130.51281150.51华公0.536190.5140240.5利1230.513当采用滚压方法加工时。外螺纹牙底形状可以做成较大的圆弧。此时允许外螺纹的小径d减小0.15P。D:、d,分别为最大实体牙型上的内螺纹大径和外螺纹小径。
