STANDARD · JIS-B2220
JIS B2220 Flange Dimensions
JIS B2220:2012 · JIS B2220
JIS B2220 is the Japanese steel pipe flange standard, sized in millimetres from 10A to 600A and rated 5K, 10K, 16K, 20K and 30K. It is specified in Japanese-designed plants, shipbuilding, marine equipment and much of South-East Asian industry.
JIS flanges use metric bolt patterns and their own outside diameters and thicknesses. A JIS 10K flange is often described as roughly equivalent to ASME Class 150, but the bolt circle and outside diameter differ — a JIS flange must be ordered as JIS and matched with JIS bolts and gaskets. The 30K series runs from 10A to 400A, and 16K/20K do not include 175A or 225A.
DIMENSIONS
Dimension tables
One row per specification. Open a size for the drawing, pressure ratings and printable A4 sheet.
Blind: A solid disc bolted over a line end or vessel opening for isolation, testing and future tie-ins. 110 specifications.
| Size | Rating | Outside Ø D | Thickness C | Raised face D2 | Bolt circle K | Bolting | Hub A | Length H | Weight | |
|---|---|---|---|---|---|---|---|---|---|---|
| 300ADN300 | 445 | 24 | 368 | 400 | 16 × Ø25 | — | — | 27.8 kg | Spec sheet | |
| 300ADN300 | 480 | 30 | 395 | 430 | 16 × Ø33 | — | — | 40.5 kg | Spec sheet | |
| 300ADN300 | 480 | 36 | 395 | 430 | 16 × Ø27 | — | — | — | Spec sheet | |
| 300ADN300 | 515 | 52 | 405 | 450 | 16 × Ø33 | — | — | — | Spec sheet | |
| 350ADN350 | 480 | 24 | 403 | 435 | 12 × Ø25 | — | — | 33 kg | Spec sheet | |
| 350ADN350 | 490 | 26 | 413 | 445 | 16 × Ø25 | — | — | 36.9 kg | Spec sheet | |
| 350ADN350 | 540 | 34 | 440 | 480 | 16 × Ø33 | — | — | 57.5 kg | Spec sheet | |
| 350ADN350 | 540 | 40 | 440 | 480 | 16 × Ø33 | — | — | — | Spec sheet | |
| 350ADN350 | 560 | 54 | 450 | 495 | 16 × Ø33 | — | — | — | Spec sheet | |
| 400ADN400 | 540 | 24 | 463 | 495 | 16 × Ø25 | — | — | 41.7 kg | Spec sheet | |
| 400ADN400 | 560 | 28 | 475 | 510 | 16 × Ø27 | — | — | 52.1 kg | Spec sheet | |
| 400ADN400 | 605 | 38 | 495 | 540 | 16 × Ø33 | — | — | 81.7 kg | Spec sheet | |
| 400ADN400 | 605 | 46 | 495 | 540 | 16 × Ø33 | — | — | — | Spec sheet | |
| 400ADN400 | 630 | 60 | 510 | 560 | 16 × Ø39 | — | — | — | Spec sheet | |
| 450ADN450 | 605 | 24 | 523 | 555 | 16 × Ø25 | — | — | 52.7 kg | Spec sheet | |
| 450ADN450 | 620 | 30 | 530 | 565 | 20 × Ø27 | — | — | 68.4 kg | Spec sheet | |
| 450ADN450 | 675 | 40 | 560 | 605 | 20 × Ø33 | — | — | 107 kg | Spec sheet | |
| 450ADN450 | 675 | 48 | 560 | 605 | 20 × Ø33 | — | — | — | Spec sheet | |
| 500ADN500 | 655 | 24 | 573 | 605 | 20 × Ø25 | — | — | 61.6 kg | Spec sheet | |
| 500ADN500 | 675 | 30 | 585 | 620 | 20 × Ø27 | — | — | 81.6 kg | Spec sheet | |
| 500ADN500 | 730 | 42 | 615 | 660 | 20 × Ø33 | — | — | 132 kg | Spec sheet | |
| 500ADN500 | 730 | 50 | 615 | 660 | 20 × Ø33 | — | — | — | Spec sheet | |
| 550ADN550 | 720 | 26 | 630 | 665 | 20 × Ø27 | — | — | 80.8 kg | Spec sheet | |
| 550ADN550 | 745 | 34 | 640 | 680 | 20 × Ø33 | — | — | 112 kg | Spec sheet | |
| 550ADN550 | 795 | 44 | 670 | 720 | 20 × Ø39 | — | — | 163 kg | Spec sheet | |
| 550ADN550 | 795 | 52 | 670 | 720 | 20 × Ø39 | — | — | — | Spec sheet | |
| 600ADN600 | 770 | 26 | 680 | 715 | 20 × Ø27 | — | — | 92.7 kg | Spec sheet | |
| 600ADN600 | 795 | 36 | 690 | 730 | 24 × Ø33 | — | — | 134 kg | Spec sheet | |
| 600ADN600 | 845 | 46 | 720 | 770 | 24 × Ø39 | — | — | 192 kg | Spec sheet | |
| 600ADN600 | 845 | 56 | 720 | 770 | 24 × Ø39 | — | — | — | Spec sheet |
REFERENCE
Pressure ratings, materials and tolerances
Transcribed from JIS B2220:2012 with table and page references.
JIS B2220 pressure–temperature ratings
Table 11 of JIS B2220:2012 is the rating table that turns a nominal JIS K number into a maximum working press…
Open reference Material groupsJIS B2220 material groups and ASTM reference materials
JIS B2220:2012 does not rate flanges by a steel name alone. It sorts materials into numbered groups and then …
Open reference TolerancesJIS B2220 dimensional tolerances (Table 22)
Table 22 of JIS B2220:2012 sets the dimensional tolerances for steel pipe flanges, in millimetres. Clause 12.…
Open reference MarkingJIS B2220 marking requirements
Clause 20 of JIS B2220:2012 defines what a flange must carry: nominal pressure, nominal size and material sym…
Open reference Types and facingsJIS B2220 flange types and gasket faces
JIS B2220:2012 classifies flanges by shape and gives each type a short designation. Table 1 defines eight of …
Open referenceHow to read the pressure class
JIS K ratings are kgf/cm² nominal: 5K ≈ 0.5 MPa, 10K ≈ 1.0 MPa, 16K ≈ 1.6 MPa, 20K ≈ 2.0 MPa and 30K ≈ 3.0 MPa. The published maximum working pressure is higher or lower than the nominal figure depending on material group and division — for material group 1.1, Division I, the JIS B2220 Table 11 value at up to 120 °C is 0.7 MPa for 5K, 1.4 MPa for 10K, 2.7 MPa for 16K, 3.4 MPa for 20K, 5.1 MPa for 30K, 6.8 MPa for 40K and 10.7 MPa for 63K. Allowable pressure falls with temperature, and JIS bolt patterns differ from ASME classes of similar pressure.
Edition and verification
Data imported 2026-11-05 08:05.