IFI 513-5-1982
Square socket countersunk flat head screws-Table 5
ASME/ANSI B18.6.7M-9-1999
Metric square socket countersunk flat head screws-Table 9
ASME/ANSI B18.6.7M-9-2005
Metric square socket countersunk flat head screws-Table 9
ASME/ANSI B18.6.7M-9-2010
Metric square socket countersunk flat head screws-Table 9