Q 120-1999
Double end studs
Q 128-1999
Double end studs(clamping type)
Q 124-1999
Double end studs b1=1.25d
Q 125-1999
Double end studs b1=1.25d
Q 129-1999
Double end studs b1=2d
Q 129B-1999
Double end studs b1=2d
Q 120-2012
Double end studs
QC/T 870-2011
Double end studs b1=1.25d
Q 124-2012
Double end studs b1=1.25d
Q 125-2012
Double end studs b1=1.25d
Q 126-2012
Double end studs
Q 128-2012
Double end studs(clamping type)
Q 129-2012
Double end studs b1=2d
Q 129B-2012
Double end studs b1=2d
QC/T 871-2011
Double end studs b1=2d
QC/T 871-2011
Double end studs b1=2d