GOST R50274-1992
Hexagon flange bolts-Type F
GOST R55739-2013
Heavy hexagon flange bolts with reduced shank-Type F
GOST R55739-2013
Heavy hexagon flange bolts with reduced shank-Type U
GOST R55739-2013
Hexagon bolts with flange-heavy series-Type F
GOST R55739-2013
Hexagon bolts with flange-heavy series-Type U