GOST 22042-1976
Double end studs
GOST 22042-1976
Double end studs with reduced shank
GOST 22043-1976
Double end studs
PN 82137
Studes with a length of engagement equal to about 2d
PN 82125
Studs with a length of engagement equal to about 1d
PN 82131
Studs with a length of engagement equal to about 1.25d
GB/T 9125.1-2020
Fasteners for steel pipe flange joints-Part 1:PN designated-Double end studs