Table of design properties for metric steel bolts M5 to M39 Eurocode 3
For typical coarse pitch thread bolts the standard sizes are: M3,, M4, M5, M6, M7, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M33, M36, M39. Width of nut across flats The width of the hexagon nuts across flats s is specified in ISO 8982 Table for bolt sizes M5 to M39.