NACE MR0175

zde by mohl být nějaký výpis TOP norem..

ANSI/ASME B16.11 Round Head Plug

ANSI/ASME B16.11 Hex Head Plug

DIN 908

Internal drive screw plugs with collar

DIN 910

Hexagon head screw plugs with collar

DIN 2509

Double end studs

Stud bolt DIN 2509