General Questions and Answers

What is B2220 flange standard?

JIS B2220 is the Japanese industrial standard for steel pipe flanges and defines dimensions, pressure ratings, materials, and marking requirements for flanges used in Japanese installations and numerous projects throughout Asia.
JIS flanges use a “K” classification system (.g., 5K, 10K, 16K, 20K, 30K, 40K, 63K, where the number roughly indicates the maximum working pressure.