... . ASTM a182 f316l flanges The specification is as follows:1-American Standard:ANSI B 16.5, ASTM, ASA, API-605, AWWA-C207 ... 1500LB, 2500LB, WNRN, SORF, BLRF, THRF, SWRF, LJRF, 2-German Standard:DIN2573, DIN2572, DIN2576, DIN2631, DIN2632, DIN2633, DIN2502, DIN2543, DIN2544, DIN2566 ... 10K, 16K, 20K, 30K, SDPFF, SOHFF, BLFF etc.5-Other standard:UNI2276, 2277, 2278, 6084, 6089, 6090, 2544, 2282, 6091-6093 ...