Table of content
Table of specific API flange chart
| API 6A Flange Size | Weld Neck Weight Lbs. | Blind Weight Lbs. | Number of Stud Bolts Per Set | Weight For 1 Set of All Thread Stud Bolts with 2 Nuts Each Lbs. | Weight for 1 Set of Tap End Studs with 1 Nut Each Lbs. | Gasket Number | Weight Lbs. |
| 1-5/8-10M /
2″-2900 * |
29.6 | 28.5 | 8 | 13.3 | 8.2 | R-85
RX-85 |
0.88
1.18 |
| 1-11/16-10M * | 19.5 | 24.7 | 8 | 7.7 | 4.7 | BX-150 | 0.29 |
| 1-11/16-15M * | 24.0 | 27.6 | 8 | 7.9 | 4.8 | BX-150 | 0.29 |
| 1-25/32-10M
2-1/2″ 2900 * |
44.4 | 43.1 | 8 | 19.5 | 12.4 | R-86
RX-86 |
1.44
1.82 |
| 1-13/16-2M * | 9.8 | 9.4 | 4 | 3.5 | 2.3 | R-20
RX-20 |
0.37
0.53 |
| 1-13/16-3M * | 16.0 | 15.6 | 4 | 7.9 | 5.1 | R-20
RX-20 |
0.37
0.53 |
| 1-13/16-5M * | 16.3 | 15.6 | 4 | 7.9 | 5.1 | R-20
RX-20 |
0.37
0.53 |
| 1-13/16-10M | 20.8 | 24.6 | 8 | 7.7 | 4.7 | BX-151 | 0.33 |
| 1-13/16-15M | 27.5 | 31.5 | 8 | 11.6 | 7.1 | BX-151 | 0.33 |
| 1-13/16-20M | 62.3 | 66.2 | 8 | 18.4 | 11.1 | BX-151 | 0.33 |
| 1-13/16-30M * | 110.4 | 114.1 | 8 | 35.0 | 21.4 | BX-151 | 0.33 |
| 2″ 960 * | 11.7 | 11.7 | 8 | 4.7 | 3.0 | R-23
RX-23 |
0.76
1.18 |
| 2-1/16-2M | 12.0 | 11.7 | 8 | 4.7 | 3.0 | R-23
RX-23 |
0.76
1.18 |
| 2-1/16-3M | 28.9 | 27.2 | 8 | 12.2 | 7.7 | R-24
RX-24 |
0.87
1.36 |
| 2-1/16-5M | 29.6 | 27.2 | 8 | 12.2 | 7.7 | R-24
RX-24 |
0.87
1.36 |
| 2-1/16-10M /
3″ 2900 * |
62.3 | 61.2 | 8 | 27.8 | 17.0 | R-87
RX-87 |
1.59
2.01 |
| 2-1/16-10M | 25.3 | 30.4 | 8 | 7.7 | 4.8 | BX-152 | 0.41 |
| 2-1/16-15M | 36.1 | 41.7 | 8 | 12.2 | 7.4 | BX-152 | 0.41 |
| 2-1/16-20M | 87.2 | 92.8 | 8 | 25.9 | 15.8 | BX-152 | 0.41 |
| 2-1/16 30M * | 126.8 | 131.9 | 8 | 36.8 | 22.3 | BX-152 | 0.41 |
| 2-1/2″ 960 * | 16.5 | 16.9 | 8 | 7.7 | 4.9 | R-26
RX-26 |
0.93
1.44 |
| 2-9/16-2M | 16.9 | 16.9 | 8 | 7.7 | 4.9 | R-26
RX-26 |
0.93
1.44 |
| 2-9/16-3M | 39.4 | 37.3 | 8 | 17.3 | 11.1 | R-27
RX-27 |
1.00
1.53 |
| 2-9/16-5M | 40.1 | 37.3 | 8 | 17.3 | 11.1 | R-27
RX-27 |
1.00
1.53 |
| 2-9/16-10M /
3-1/2″ 2900 * |
88.8 | 89.9 | 8 | 37.4 | 23.2 | R-89
RX-89 |
2.49
3.03 |
| 2-9/16-10M | 39.0 | 47.5 | 8 | 12.2 | 7.4 | BX-153 | 0.62 |
| 2-9/16-15M | 52.0 | 60.7 | 8 | 17.6 | 10.7 | BX-153 | 0.62 |
| 2-9/16-20M | 122.7 | 132.1 | 8 | 35.6 | 21.4 | BX-153 | 0.62 |
| 2-9/16-30M * | 175.8 | 185.4 | 12 | 57.9 | 34.4 | BX-153 | 0.62 |
| 3″ 960 * | 21.3 | 24.2 | 8 | 7.9 | 5.0 | R-31
RX-31 |
1.14
1.77 |
| 3-1/8-2M | 21.8 | 22.7 | 8 | 7.9 | 5.0 | R-31
RX-31 |
1.14
1.77 |
| 3-1/8-3M | 35.8 | 34.9 | 8 | 12.2 | 7.7 | R-31
RX-31 |
1.14
1.77 |
| 3-1/8-5M | 52.4 | 49.6 | 8 | 24.4 | 15.6 | R-35
RX-35 |
1.25
1.95 |
| 3-1/8-10M
4″ 2900 * |
112.9 | 113.9 | 8 | 49.0 | 30.4 | R-88
RX-88 |
2.70
3.26 |
| 3-1/16-10M | 60.1 | 73.2 | 8 | 17.6 | 10.9 | BX-154 | 0.85 |
| 3-1/16-15M | 75.7 | 89.1 | 8 | 24.9 | 15.4 | BX-154 | 0.85 |
| 3-1/16-20M | 157.7 | 172.5 | 8 | 46.7 | 28.2 | BX-154 | 0.85 |
| 3-1/16-30M * | 256.1 | 270.5 | 12 | 76.8 | 45.6 | BX-154 | 0.85 |
| 4″ 960 * | 33.1 | 36.4 | 8 | 11.9 | 7.5 | R-37
RX-37 |
1.37
2.13 |
| 4-1/16-2M | 44.4 | 45.7 | 8 | 12.2 | 7.7 | R-37
RX-37 |
1.37
2.13 |
| 4-1/16-3M | 57.9 | 57.6 | 8 | 23.9 | 15.4 | R-37
RX-37 |
1.37
2.13 |
| 4-1/16-5M | 78.4 | 76.2 | 8 | 33.2 | 21.1 | R-39
RX-39 |
1.49
2.31 |
| 4-1/16-10M /
5″ 2900 * |
167.9 | 169.1 | 8 | 80.9 | 50.5 | R-90
RX-90 |
4.51
6.84 |
| 4-1/16-10M | 99.1 | 125.1 | 8 | 25.9 | 15.8 | BX-155 | 1.44 |
| 4-1/16-15M | 142.6 | 169.8 | 8 | 45.2 | 27.4 | BX-155 | 1.44 |
| 4-1/16-20M | 298.5 | 328.5 | 8 | 94.7 | 57.7 | BX-155 | 1.44 |
| 4-1/16-30M * | 500.6 | 529.3 | 12 | 154.5 | 93.0 | BX-155 | 1.44 |
| 5″ 960 * | 42.6 | 47.9 | 8 | 12.2 | 7.7 | R-41
RX-41 |
1.66
2.58 |
| 5-1/8-2M | 75.1 | 76.5 | 8 | 17.6 | 11.3 | R-41
RX-41 |
1.66
2.58 |
| 5-1/8-3M | 92.1 | 93.5 | 8 | 32.5 | 20.8 | R-41
RX-41 |
1.66
2.58 |
| 5-1/8-5M | 145.7 | 143.8 | 8 | 58.4 | 36.8 | R-44
RX-44 |
1.78
2.76 |
| 5-1/8-10M | 140.3 | 134.5 | 12 | 41.0 | 24.5 | BX-169 | 1.74 |
| 5-1/8-15M | 231.1 | 220.1 | 12 | 93.0 | 56.5 | BX-169 | 1.74 |
| 6″ 960 * | 55.2 | 65.2 | 12 | 18.7 | 11.7 | R-45
RX-45 |
1.94
3.01 |
| 7-1/16-2M | 88.2 | 92.0 | 12 | 27.0 | 17.2 | R-45
RX-45 |
1.94
3.01 |
| 7-1/16-3M | 119.0 | 119.5 | 12 | 38.8 | 24.1 | R-45
RX-45 |
1.94
3.01 |
| 7-1/16-5M | 176.3 | 176.6 | 12 | 74.5 | 45.6 | R-46
RX-46 |
2.38
3.67 |
| 7-1/16-10M /
10″ 2900 * |
480.1 | 480.0 | 12 | 235.9 | 144.9 | R-91
RX-91 |
15.64
17.16 |
| 7-1/16-10M | 319.8 | 315.2 | 12 | 94.3 | 57.2 | BX-156 | 4.04 |
| 7-1/16-15M | 405.0 | 390.3 | 16 | 134.7 | 80.7 | BX-156 | 4.04 |
| 7-1/16-20M | 949.1 | 893.9 | 16 | 327.5 | 193.2 | BX-156 | 4.04 |
| 7-1/16-30M * | 1779.4 | 1888.1 | 16 | 611.4 | 362.8 | BX-156 | 4.04 |
| 8″ 960 * | 85.4 | 106.7 | 12 | 27.0 | 17.2 | R-49
RX-49 |
2.47
3.85 |
| 9-2M | 130.2 | 146.8 | 12 | 38.8 | 24.1 | R-49
RX-49 |
2.47
3.85 |
| 9-3M | 204.5 | 204.8 | 12 | 66.8 | 42.3 | R-49
RX-49 |
2.47
3.85 |
| 9-5M | 306.9 | 299.8 | 12 | 118.1 | 73.3 | R-50
RX-50 |
4.42
6.35 |
| 9-10M | 488.1 | 498.5 | 16 | 138.3 | 81.6 | BX-157 | 6.40 |
| 9-15M | 842.1 | 807.4 | 16 | 259.7 | 154.1 | BX-157 | 6.40 |
| 9-20M | 1738.0 | 1651.8 | 16 | 632.1 | 375.8 | BX-157 | 6.40 |
| 10″ 960 * | 117.8 | 158.9 | 16 | 50.8 | 32.1 | R-53
RX-53 |
2.97
4.63 |
| 11-2M | 248.2 | 240.1 | 16 | 69.9 | 44.0 | R-53
RX-53 |
2.97
4.63 |
| 11-3M | 302.0 | 300.8 | 16 | 92.0 | 57.9 | R-53
RX-53 |
2.97
4.63 |
| 11-5M | 533.5 | 512.3 | 12 | 179.8 | 111.3 | R-54
RX-54 |
5.30
7.63 |
| 11-10M | 772.5 | 809.3 | 16 | 215.9 | 128.9 | BX-158 | 9.36 |
| 11-15M | 1949.9 | 1619.4 | 20 | 438.0 | 255.7 | BX-158 | 9.36 |
| 11-20M | 2235.7 | 2198.3 | 16 | 836.6 | 497.3 | BX-158 | 9.36 |
| 12″ 960 * | 169.2 | 231.5 | 16 | 67.5 | 42.8 | R-57
RX-57 |
3.49
5.44 |
| 13-5/8-2M | *** | 302.3 | 20 | 88.9 | 55.8 | R-57
RX-57 |
3.49
5.44 |
| 13-5/8-3M | *** | 419.1 | 20 | 120.5 | 75.1 | R-57
RX-57 |
3.49
5.44 |
| 13-5/8-5M /
14″ 1500 * |
*** | 1033.4 | 16 | 430.3 | 265.2 | R-63
RX-63 |
16.12
26.47 |
| 13-5/8-5M | 616.7 | 743.5 | 16 | 159.6 | 96.7 | BX-160 | 6.64 |
| 13-5/8-10M | 1236.9 | 1329.3 | 20 | 349.6 | 205.1 | BX-159 | 14.08 |
| 13-5/8-15M | 2008.8 | 2098.0 | 20 | 611.0 | 360.2 | BX-159 | 14.08 |
| 13-5/8-20M | 5075.1 | 5008.3 | 20 | 1504.7 | 875.2 | BX-159 | 14.08 |
| 16″ 960 * | 294.6 | 393.4 | 20 | 111.3 | 70.5 | R-65
RX-65 |
4.31
6.71 |
| 16-3/4-2M | *** | 515.0 | 20 | 148.3 | 93.1 | R-65
RX-65 |
4.31
6.71 |
| 16-3/4-3M | *** | 636.8 | 20 | 194.2 | 120.9 | R-66
RX-66 |
7.69
10.48 |
| 16-3/4-5M | 810.2 | 1085.8 | 16 | 245.5 | 147.0 | BX-162 | 4.96 |
| 16-3/4-10M | 1464.5 | 1813.1 | 24 | 419.6 | 246.2 | BX-162 | 4.96 |
| 17-3/4-2M * | *** | 649.2 | 20 | 155.0 | 97.6 | R-69
RX-69 |
4.89
7.62 |
| 17-3/4-3M * | *** | 904.0 | 20 | 296.1 | 183.7 | R-70
RX-70 |
11.79
20.16 |
| 18-3/4-5M | 1616.6 | 1871.9 | 20 | 409.4 | 243.5 | BX-163 | 14.70 |
| 18-3/4-10M | 2999.2 | 3256.1 | 24 | 770.7 | 451.1 | BX-164 | 21.35 |
| 18-3/4-15M | 4357.6 | 4628.2 | 20 | 1391.3 | 823.2 | BX-164 | 21.35 |
| 20″ 960 * | 440.0 | 623.5 | 24 | 175.3 | 110.4 | R-73
RX-73 |
6.59
11.65 |
| 21-1/4-2M | *** | 842.5 | 24 | 233.1 | 145.1 | R-73
RX-73 |
6.59
11.65 |
| 20-3/4-3M | *** | 1131.0 | 20 | 364.5 | 225.1 | R-74
RX-74 |
12.91
22.05 |
| 21-1/4-5M | 2086.4 | 2463.2 | 24 | 515.8 | 302.0 | BX-165 | 18.74 |
| 21-1/4-10M | 3877.9 | 4304.1 | 24 | 1041.6 | 606.5 | BX-166 | 27.17 |
| 26-3/4-2M | 1435.1 | 1931.0 | 20 | 257.5 | 153.5 | BX-167 | 17.85 |
| 26-3/4-3M | 2088.0 | 2566.0 | 24 | 486.4 | 287.3 | BX-168 | 22.23 |
| 30″ 300# MSS ** | 1055.9 | 1694.6 | 28 | 347.6 | 214.8 | R-95 | 18.70 |
| 30″ 600# MSS ** | 1426.2 | 2516.7 | 28 | 527.5 | 323.7 | R-95 | 18.70 |
| 30″ 900# MSS ** | 2323.4 | 3816.8 | 20 | 1155.4 | 719.3 | R-102 | 51.49 |
| 30-2M | 1691.4 | 2454.2 | 32 | 348.8 | 208.2 | BX-303 | 27.57 |
| 30-3M | 2457.8 | 3239.9 | 32 | 559.4 | 328.1 | BX-303 | 27.57 |
