圈上序大峰 Design Profile of the nut and bolt H H Bolt D H d=D 6 H=0.86603p: D3=d2=d-0.6495p; D1=d-1.0825p;d=d-1.2268p: 出-音压贤出- H d=Diameter of nut; D=Diameter of bolt. © 上海充廷大学 Tolerances and Allowances ▣Allowances(配合余量) >Specify the clearance()provided for nuts and screws to accommodate coatings and/or foreign material after mating ▣Tolerances（公差) >Specify limits on acceptable manufacturing errors in producing screws and nuts to comply with standard profiles and dimensions. Applied to screws and nuts major and minor diameters. Basic Hole or Basic Shaft H7 H7 6 n6 1818 Design Profile of the nut and bolt  Allowances（配合余量）  Specify the clearance(间隙) provided for nuts and screws to accommodate coatings and/or foreign material after mating  Tolerances（公差）  Specify limits on acceptable manufacturing errors in producing screws and nuts to comply with standard profiles and dimensions.  Applied to screws and nuts major and minor diameters.  Basic Hole or Basic Shaft Tolerances and Allowances 7 6 H m 7 6 H n