CNS 3125-1980
Hexagon head fitting bolts for steel structures
CNS 4364-1981
Hexagon head fitting bolts with long threaded portion
CNS 4365-1981
Hexagon head fitting bolts with short threaded portion
CNS 4366-1987
Hexagon bolts with large widths across flats for steel structures (joints with hightensile, prestressed bolts)