GB/T 898-1988
Double end studs b1=1.25d-type B
HG/T 20613-2009
Bolting for use with stral pipe falanges-Double end sutds
Q 124-1999
Double end studs b1=1.25d
Q 125-1999
Double end studs b1=1.25d
Q 124-2012
Double end studs b1=1.25d
Q 125-2012
Double end studs b1=1.25d
GOST 22032-1976
Double end studs with reduced shank b1=1d
GOST 22042-1976
Double end studs with reduced shank