GB/T 898-1988
Double end studs b1=1.25d-type A
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
SH/T 3404-1996
Fasteners for pipe flanges—Double end studs
GB/T 9125-2010
Fasteners for pipe flange joints—Double end studs—Commodity fastener
GB/T 9125-2010
Fasteners for pipe flange joints—Double end studs—Special fastener
GB/T 9125-2010
Fasteners for pipe flange joints—Double end studs—Commodity fastener L≤2b
GB/T 9125-2010
Fasteners for pipe flange joints—Double end studs—Special fastener L≤2b
GB/T 901-1988
Double end studs (clamping type)
GB/T 901-1988
Double end studs (clamping type)—L≤2b Non full thread
GB/T 897-1988
Double end studs—b1=1d—Type A
GB/T 897-1988
Double end studs—b1=1d—Type B
GB/T 899-1988
Double end studs b1=1.5d—Type A
GB/T 899-1988
Double end studs —b1=1.5d(Type B)
GB/T 900-1988
Double end studs b1=2d—Type A
GB/T 900-1988
Double end studs b1=2d—Type B
GB/T 953-1988
Double end studs (clamping type)—Standard type
GB/T 953-1988
Double end studs(clamping type) -Elongated type
DIN 835-1995
Studes with a length of engagement equal to about 2d
DIN 938-1995
Studs with a length of engagement equal to about 1d