GB/T 819.1Countersunk flat head screws with type H cross recess
ISO 7046-1Countersunk flat head screws with type H cross recess
JIS B1111-2Countersunk flat head screws with type H cross recess for strength class 4.8-Table 2
KS B1023Countersunk flat head screws with type H cross recess
NF E25-119-1Countersunk flat head screws with type H cross recess