"Size","Pitch (coarse)","Head Ø dk max","Head height k max","Hex key s"
"M3","0.5","5.7","1.65","2"
"M4","0.7","7.6","2.2","2.5"
"M5","0.8","9.5","2.75","3"
"M6","1","10.5","3.3","4"
"M8","1.25","14","4.4","5"
"M10","1.5","17.5","5.5","6"
"M12","1.75","21","6.6","8"
"M16","2","28","8.8","10"
"Reference only — confirm against drawing. ISO 7380-1. REL India"