GB/T 27-2013
Hexagon fit bolts
GB/T 28-2013
Hexagon head fit bolts with split pin hole on shank
CNS 3125-1980
Hexagon head fitting bolts for steel structures
GOST 7817-1980
Hexagon head fit bolts with split pin hole on shank
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)
PN 82342
Hexagon fit bolt
PN 82341
Hexagon fit bolt with short threaded dog point
PN 82341
Hexagon fit bolt with short threaded dog point