Nominal Dia (mm),Bolt Dia (mm),Inner Dia (mm),Outer Dia (mm),Thickness (mm)
M3,3.2,3.2,6.0,0.7
M4,4.3,4.3,9.0,0.8
M5,5.3,5.3,10.0,1.0
M6,6.4,6.4,12.0,1.6
(M7),7.4,7.4,14.0,1.6
M8,8.4,8.4,16.0,1.6
M10,10.5,10.5,20.0,2.0
M12,13.0,13.0,24.0,2.5
(M14),15.0,15.0,28.0,2.5
M16,17.0,17.0,30.0,3.0
(M18),19.0,19.0,34.0,3.0
M20,21.0,21.0,37.0,3.0
(M22),23.0,23.0,39.0,3.0
M24,25.0,25.0,44.0,4.0