GB/T 16674.2-2016
Hexagon bolts with flange with metric fine pitch thread—Small series—Type U
GB/T 16674.2-2004
Hexagon bolts with flange with metric fine pitch thread—Small series—Type U
DIN 6922-1983
Hexagon flange bolts with reduced shank - standard design
DIN 6922-1983
Hexagon flange bolts with reduced shank - grooved design (HO)
Q 183-2012
Hexagon bolts with flange with metric fine pitch thread—Small series—Type U