Common standards for stainless steel flanges
1: National standard: GB9112-88 (GB9113·1-88~GB9123·36-88.
2: American Standard: ANSI B16.5, ANSI 16.47 Class150, 300, 600, 900, 1500 (TH, LJ, SW).
3: Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL).
4: German standard: DIN2527, 2543, 2545, 2566, 2572, 2573, 2576, 2631, 2632, 2633, 2634, 2638 (PL, SO, WN, BL, TH).
5: Italian standard: UNI2276, 2277, 2278, 6083, 6084, 6088, 6089, 2299, 2280, 2281, 2282, 2283 (PL, SO, WN, BL, TH).
6: British Standard: BS4504, 4506.
7: Standards of the Ministry of Chemical Industry: HG5010-52~HG5028-58, HGJ44-91~HGJ65-91 HG20592-97 (HG20593-97~HG20614-97) HG20615-97 (HG20616-97~HG20635-97).
8: Mechanical department standard: JB81-59~JB86-59, JB/T79-94~JB/T86-94.
9: Pressure vessel standard: JB1157-82~JB1160-82, JB4700-2000~JB4707-2000.
10: Marine flange standards: GB/T11694-94, GB/T3766-1996, GB/T11693-94, GB10746-89, GB/T4450-1995, GB/T11693-94, GB573-65, GB2506-89, CBM1012 -81, CBM1013, etc.