NoticeFrom thread diameter M5, stud bolts may be marked with the following colours at one end (face) as an alternative to marking of the strength class.
Steel 4.8 — no marking
Steel 8.8 — RAL 1023 Traffic Green
Steel 10.9 — RAL 1013 Oyster White
A2 — RAL 6024 Traffic Green
A4 — RAL 3000 Flame Red
CuZn (brass) — no marking
