DIN 908-1992
Hexagon socket screw plugs
JB/ZQ 4452-2006
Cheese head screws plug
CNS 4847-1982
Hexagon socket pipe plugs with shoulder and parallel thread
JB/ZQ4444-1997
Hexagon socket pipe plugs with shoulder and parallel thread
JB/ZQ4444-2006
Hexagon socket pipe plugs with shoulder and parallel thread