API Flange Dimensions
| Nom. size | No. of holes | Outside diam. of flange | Diam. of hub | Hub diam. top | Diam. of bolt hole | Diam. of bolt | Thick. of flange | Length through hub | Diam. of bolt circle | Raised face diam. | Fillet radius min. | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| O | X | A | C | Y | R | r1 | ||||||
| in. | 26″ | 36 | 30.94 | 26.94 | 26.06 | 0.88 | 3/4″ | 1.62 | 3.5 | 29.31 | 28 | 0.38 |
| mm. | 785.9 | 684.3 | 661.9 | 22.4 | 19.1 | 41.1 | 88.9 | 744.5 | 711.2 | 9.7 | ||
| in. | 28″ | 40 | 32.94 | 28.94 | 28.06 | 0.88 | 3/4″ | 1.75 | 3.75 | 31.31 | 30 | 0.38 |
| mm. | 836.7 | 735.1 | 712.7 | 22.4 | 19.1 | 44.5 | 95.3 | 795.3 | 762 | 9.7 | ||
| in. | 30″ | 44 | 34.94 | 31 | 30.06 | 0.88 | 3/4″ | 1.75 | 3.94 | 33.31 | 32 | 0.38 |
| mm. | 887.5 | 787.4 | 763.5 | 22.4 | 19.1 | 44.5 | 100.1 | 846.1 | 812.8 | 9.7 | ||
| in. | 32″ | 48 | 37.06 | 33.06 | 32.06 | 0.88 | 3/4″ | 1.81 | 4.25 | 35.44 | 34 | 0.38 |
| mm. | 941.3 | 839.7 | 814.3 | 22.4 | 19.1 | 46 | 108 | 900.2 | 863.6 | 9.7 | ||
| in. | 34″ | 40 | 39.56 | 35.12 | 34.06 | 1 | 7/8″ | 1.94 | 4.34 | 37.69 | 36.25 | 0.38 |
| mm. | 1004.8 | 892 | 865.1 | 25.4 | 22.2 | 49.3 | 110.2 | 957.3 | 920.8 | 9.7 | ||
| in. | 36″ | 44 | 41.62 | 37.19 | 36.06 | 1 | 7/8″ | 2.06 | 4.62 | 39.75 | 38.25 | 0.38 |
| mm. | 1057.1 | 944.6 | 915.9 | 25.4 | 22.2 | 52.3 | 117.3 | 1009.7 | 971.6 | 9.7 | ||
| in. | 38″ | 40 | 44.25 | 39.12 | 38.12 | 1.12 | 1″ | 2.12 | 4.88 | 42.12 | 40.25 | 0.38 |
| mm. | 1124 | 993.6 | 968.2 | 28.4 | 25.4 | 53.8 | 124 | 1069.8 | 1022.4 | 9.7 | ||
| in. | 40″ | 44 | 46.25 | 41.31 | 40.12 | 1.12 | 1″ | 2.19 | 5.06 | 44.12 | 42.5 | 0.38 |
| mm. | 1174.8 | 1049.3 | 1019 | 28.4 | 25.4 | 55.6 | 128.5 | 1120.6 | 1079.5 | 9.7 | ||
| in. | 42″ | 48 | 48.25 | 43.38 | 42.12 | 1.12 | 1″ | 2.31 | 5.25 | 46.12 | 44.5 | 0.44 |
| mm. | 1225.6 | 1101.9 | 1069.8 | 28.4 | 25.4 | 58.7 | 133.4 | 1171.4 | 1130.3 | 11.2 | ||
| in. | 44″ | 52 | 50.25 | 45.38 | 44.12 | 1.12 | 1″ | 2.38 | 5.38 | 48.12 | 46.5 | 0.44 |
| mm. | 1276.4 | 1152.7 | 1120.6 | 28.4 | 25.4 | 60.5 | 136.7 | 1222.2 | 1181.1 | 11.2 | ||
| in. | 46″ | 40 | 52.81 | 47.44 | 46.12 | 1.25 | 1 1/8″ | 2.44 | 5.69 | 50.56 | 48.62 | 0.44 |
| mm. | 1341.4 | 1205 | 1171.4 | 31.8 | 28.6 | 62 | 144.5 | 1284.2 | 1234.9 | 11.2 | ||
| in. | 48″ | 44 | 54.81 | 49.5 | 48.12 | 1.25 | 1 1/8″ | 2.56 | 5.88 | 52.56 | 50.75 | 0.44 |
| mm. | 1392.2 | 1257.3 | 1222.2 | 31.8 | 28.6 | 65 | 149.4 | 1335 | 1289.1 | 11.2 | ||
| in. | 50″ | 48 | 56.81 | 51.5 | 50.12 | 1.25 | 1 1/8″ | 2.69 | 6.06 | 54.56 | 52.75 | 0.44 |
| mm. | 1443 | 1308.1 | 1273 | 31.8 | 28.6 | 68.3 | 153.9 | 1385.8 | 1339.9 | 11.2 | ||
| in. | 52″ | 52 | 58.81 | 53.56 | 52.12 | 1.25 | 1 1/8″ | 2.75 | 6.19 | 56.56 | 54.75 | 0.44 |
| mm. | 1493.8 | 1360.4 | 1323.8 | 31.8 | 28.6 | 69.9 | 157.2 | 1436.6 | 1390.7 | 11.2 | ||
| in. | 54″ | 56 | 61 | 55.62 | 54.12 | 1.25 | 1 1/8″ | 2.81 | 6.38 | 58.75 | 56.75 | 0.44 |
| mm. | 1549.4 | 1412.7 | 1374.6 | 31.8 | 28.6 | 71.4 | 162.1 | 1492.3 | 1441.5 | 11.2 | ||
| in. | 56″ | 60 | 63 | 57.69 | 56.12 | 1.25 | 1 1/8″ | 2.88 | 6.56 | 60.75 | 58.75 | 0.56 |
| mm. | 1600.2 | 1465.3 | 1425.4 | 31.8 | 28.6 | 73.2 | 166.6 | 1543.1 | 1492.3 | 14.2 | ||
| in. | 58″ | 48 | 65.94 | 59.69 | 58.12 | 1.38 | 1 1/4″ | 2.94 | 6.88 | 63.44 | 60.75 | 0.56 |
| mm. | 1674.9 | 1516.1 | 1476.2 | 35.1 | 31.8 | 74.7 | 174.8 | 1611.4 | 1543.1 | 14.2 | ||
| in. | 60″ | 52 | 67.94 | 61.81 | 60.12 | 1.38 | 1 1/4″ | 3 | 7.06 | 65.44 | 63 | 0.56 |
| mm. | 1725.7 | 1570 | 1527 | 35.1 | 31.8 | 76.2 | 179.3 | 1662.2 | 1600.2 | 14.2 |