DIN 939-1995
Studs with a length of engagement equal to about 1.25d
DIN 940-1995
Studs with a length of engagement equal to about 2.5d
DIN 949-1-1995
Metric interference-fit thread studs ith a length of engagement equal to about 2d—Type A
DIN 949-2-1995
Metric interference-fit thread studs ith a length of engagement equal to about 2d—Type B
DIN 2509-1986
Double end studs
CB/T 908-1996
The side of the ship has unequal studs
CB/T 908-1996
An equal-length twin stud is used on the side of the ship
NB/T 47027-2012
Equal-length twin stud for pressure vessel flange -type B
NB/T 47027-2012
Equal-length twin stud for pressure vessel flange -type A
Q 120-1999
Double end studs
Q 128-1999
Double end studs(clamping type)
DL/T 1236-2013
Double ends anchor bolt
GB/T 33943-2017
Structural studs
Q 121-1999
Double end studs b1=1.25d
Q 121B-1999
Double end studs b1=1.25d
Q 123B-1999
Double end studs b1=1.25d
Q 123-1999
Double end studs b1=1.25d
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
