ISO 14581 Hexalobular socket countersunk flat head screws

ISO 14581

Dimensions for ISO 14581 Hexalobular socket countersunk flat head screws

Thread d p b dk kc r Inner Hexalobular
teoretic actual hexalobular number A t
min max nom=max min. nom.=max max ref. max min
M 2 without mounting shaft 25 4.4 3.8 3.5 1.2 0.5 6 1.75 0.64 0.51
M 2.5   25 5.5 4.7 4.4 1.5 0.6 8 2.4 0.79 0.66
M 3   25 6.3 5.5 5.2 1.65 0.8 10 2.8 0.83 0.7
M 3.5   38 8.2 7.3 6.94 2.35 0.9 15 3.35 1.32 1.16
M 4   38 9.4 8.4 8.04 2.7 1 20 3.95 1.53 1.14
M 5 Stepped shaft 38 10.4 9.3 8.94 2.7 1.3 25 4.5 1.51 1.12
M 6   38 12.6 11.3 10.87 3.3 1.5 30 5.6 1.78 1.39
M 8   38 17.3 15.8 15.37 4.65 2 45 7.95 2.54 2.15
M 10   38 20 18.3 17.78 5 2.5 50 8.98 2.8 2.41