ANSIB1605、WN、SO、SW、PL、BL、TH、LJ.
JIS、B2220.
DIN、2527-2635
Europe series, state standard:HG20592-97<-->HG20614-97
America series, state standard:HG20615-97<-->HG20635-97
state standard:GB9112-GB9123-88
Petrochemistry and machine office standard:JI81-86-59-94、JB2555-79
electric power office standard:GD-87 DG-78
chemical office standard:HGJ44-76-91 HG5010-5028-58
pressure vessel flange:JB/T 4700-4707-2000
