To estimate the weight of ASME B16.5 flanges (including Slip-On, Threaded, Socket Weld, Lap Joint, Blind, and Weld Neck), the material, size, and pressure class of the flange must be considered. The weight can be calculated based on the flange’s design and dimensions, such as the outer diameter (OD), thickness, and material density. To simplify the process, the weight of the flange can also be estimated by referring to a table.
ASME B16.5 Class 150 Flanges Weight Chart (in kilograms)
| NPS | Slip On | Thd | Socket Weld | Lap Joint | Blind | Weld Neck |
| 1/2 | 0.5 | 0.5 | 0.9 | 0.5 | 0.9 | 0.9 |
| 3/4 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 |
| 1 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 1.4 |
| 11/4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 |
| 11/2 | 1.4 | 1.4 | 1.4 | 1.4 | 1.8 | 1.8 |
| 2 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.7 |
| 21/2 | 3.6 | 3.6 | 3.6 | 3.6 | 3.2 | 4.5 |
| 3 | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | 5.2 |
| 31/2 | 4 | 5.4 | 4 | 4 | 5.9 | 5.4 |
| 4 | 5.9 | 5.9 | 5.9 | 5.9 | 7.7 | 7.4 |
| 5 | 6.8 | 6.8 | 6.8 | 6.8 | 9 | 9.5 |
| 6 | 8.6 | 8.6 | 8.6 | 8.6 | 12.2 | 11.7 |
| 8 | 13.5 | 13.5 | 13.5 | 13.5 | 21.2 | 18.9 |
| 10 | 19.4 | 19.4 | 19.4 | 19.4 | 31.5 | 24.3 |
| 12 | 28.8 | 28.8 | 28.8 | 28.8 | 55.4 | 39.6 |
| 14 | 40.5 | 40.5 | 40.5 | 47.3 | 63 | 51.3 |
| 16 | 47.7 | 44.1 | 44.1 | 63 | 81 | 63 |
| 18 | 58.5 | 58.5 | 58.5 | 72 | 99 | 74.3 |
| 20 | 74.3 | 74.3 | 74.3 | 87.8 | 128.3 | 88.7 |
| 22 | 83.3 | 83.3 | 83.3 | 110.3 | 159.8 | 101.3 |
| 24 | 99 | 99 | 99 | 123.8 | 193.5 | 120.6 |
ASME B16.5 Class 300 Flanges Weight Chart (in kilograms)
| NPS | Slip On | Thd | Socket Weld | Lap Joint | Blind | Weld Neck |
| 1/2 | 0.9 | 0.9 | 1.4 | 0.9 | 0.9 | 0.9 |
| 3/4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 |
| 1 | 1.4 | 1.4 | 1.4 | 1.4 | 1.8 | 1.8 |
| 11/4 | 2 | 2 | 1.8 | 2.1 | 2.7 | 2.3 |
| 11/2 | 2.9 | 2.9 | 2.7 | 2.9 | 3.2 | 3.2 |
| 2 | 3.2 | 3.2 | 3.2 | 3.2 | 3.6 | 4.1 |
| 21/2 | 4.5 | 4.5 | 4.5 | 4.5 | 5.4 | 5.4 |
| 3 | 5.9 | 6.3 | 5.9 | 6.5 | 7.2 | 8.1 |
| 31/2 | 7.7 | 7.7 | 7.7 | 7.7 | 9.5 | 9 |
| 4 | 10.6 | 10.8 | 9.9 | 10.8 | 12.6 | 11.9 |
| 5 | 13 | 13.9 | 12.6 | 12.6 | 16.7 | 16.2 |
| 6 | 17.6 | 17.6 | 17.6 | 17.6 | 22.5 | 20.3 |
| 8 | 26.1 | 26.1 | 26.1 | 26.1 | 36.5 | 31.1 |
| 10 | 36.5 | 36.5 | 36.5 | 40 | 55.8 | 45 |
| 12 | 51.8 | 51.8 | 51.8 | 63 | 83.3 | 63.9 |
| 14 | 74.3 | 74.3 | 74.3 | 85.5 | 112.5 | 92.7 |
| 16 | 94.5 | 99 | 85.5 | 105.3 | 141.8 | 112.5 |
| 18 | 113.9 | 126 | 112.5 | 137.3 | 186.3 | 144 |
| 20 | 141.8 | 146.3 | 141.8 | 168.8 | 231.8 | 180 |
| 22 | 166.5 | 166.5 | 166.5 | 195.8 | 288 | 209.3 |
| 24 | 220.5 | 220.5 | 213.8 | 247.5 | 360 | 261 |
ASME B16.5 Class 400 Flanges Weight Chart (in kilograms)
| NPS | Slip On | Thd | Socket Weld | Lap Joint | Blind | Weld Neck |
| 1/2 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 1.4 |
| 3/4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.6 |
| 1 | 1.6 | 1.6 | 1.6 | 1.6 | 1.8 | 1.8 |
| 11/4 | 2 | 2 | 2 | 2 | 2.7 | 2 |
| 11/2 | 2.9 | 2.9 | 2.9 | 2.9 | 3.6 | 3.6 |
| 2 | 3.6 | 3.6 | 3.6 | 3.6 | 4.5 | 4.5 |
| 21/2 | 5.4 | 5.4 | 5.4 | 4 | 6.8 | 6.3 |
| 3 | 6.8 | 6.8 | 6.8 | 6.3 | 9 | 8.1 |
| 31/2 | 9.5 | 9.5 | 9.5 | 9 | 13 | 11.7 |
| 4 | 11.7 | 11.7 | 11.7 | 11.3 | 14.9 | 15.8 |
| 5 | 13.9 | 13.9 | 13.9 | 13 | 19.8 | 19.4 |
| 6 | 19.8 | 19.8 | 19.8 | 18.9 | 27.5 | 25.7 |
| 8 | 30.2 | 30.2 | 30.2 | 28.8 | 45 | 40.1 |
| 10 | 40 | 40 | 40 | 49.5 | 69.8 | 56.3 |
| 12 | 58.5 | 58.5 | 58.5 | 68.4 | 101.7 | 78.8 |
| 14 | 85 | 85 | 85 | 94.5 | 139.5 | 104.9 |
| 16 | 113.9 | 113.9 | 113.9 | 126 | 179.1 | 132.8 |
| 18 | 139.5 | 139.5 | 139.5 | 155.3 | 225.9 | 162 |
| 20 | 170.1 | 170.1 | 170.1 | 189 | 279.5 | 200.3 |
| 22 | 182.3 | 182.3 | 182.3 | 204.8 | 324 | 227.3 |
| 24 | 242.6 | 242.6 | 242.6 | 276.8 | 421.2 | 288 |
ASME B16.5 Class 600 Flanges Weight Chart (in kilograms)
| NPS | Slip On | Thd | Socket Weld | Lap Joint | Blind | Weld Neck |
| 1/2 | 0.9 | 0.9 | 0.9 | 0.9 | 1.4 | 1.4 |
| 3/4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.8 | 1.8 |
| 1 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 |
| 11/4 | 2.3 | 2.3 | 2.3 | 2.3 | 2.7 | 2.7 |
| 11/2 | 3.2 | 3.2 | 3.2 | 3.2 | 3.6 | 3.6 |
| 2 | 4.1 | 4.1 | 4.1 | 4.1 | 4.5 | 5.4 |
| 21/2 | 5.9 | 5.9 | 5.9 | 5.4 | 6.8 | 8.1 |
| 3 | 7.2 | 7.2 | 7.2 | 6.8 | 9 | 10.4 |
| 31/2 | 9.5 | 9.5 | 9.5 | 9 | 13 | 11.7 |
| 4 | 16.7 | 16.7 | 16.7 | 16.2 | 18.5 | 18.9 |
| 5 | 28.4 | 28.4 | 28.4 | 28.4 | 30.6 | 30.6 |
| 6 | 36 | 36 | 36 | 35.1 | 38.7 | 36.5 |
| 8 | 51.8 | 51.8 | 51.8 | 50.4 | 63 | 54 |
| 10 | 79.7 | 79.7 | 79.7 | 87.8 | 103 | 85.5 |
| 12 | 96.8 | 96.8 | 96.8 | 108 | 132.8 | 101.7 |
| 14 | 116.6 | 116.6 | 116.6 | 130.5 | 170.1 | 156.2 |
| 16 | 164.7 | 164.7 | 164.7 | 180 | 237.2 | 216.5 |
| 18 | 214.2 | 214.2 | 214.2 | 211.1 | 299.3 | 249.8 |
| 20 | 275.4 | 275.4 | 275.4 | 271.8 | 384.8 | 310.5 |
| 22 | 265.5 | 265.5 | 265.5 | 301.5 | 450 | 324 |
| 24 | 394.2 | 394.2 | 394.2 | 389.7 | 562.5 | 439.7 |
ASME B16.5 Class 900 Flanges Weight Chart (in kilograms)
| NPS | Slip On | Thd | Socket Weld | Lap Joint | Blind | Weld Neck |
| 1/2 | 2.7 | 2.7 | 2.7 | 2.7 | 1.8 | 3.2 |
| 3/4 | 2.7 | 2.7 | 2.7 | 2.7 | 2.7 | 3.2 |
| 1 | 3.4 | 3.4 | 3.4 | 3.4 | 4.1 | 3.8 |
| 11/4 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 |
| 11/2 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 |
| 2 | 9.9 | 9.9 | 9.9 | 9.5 | 11.3 | 10.8 |
| 21/2 | 13.9 | 13.9 | 13.9 | 11.3 | 14.4 | 13.9 |
| 3 | 16.2 | 16.2 | 16.2 | 13 | 15.8 | 16.2 |
| 4 | 23.9 | 23.9 | 23.9 | 22 | 24.3 | 23.9 |
| 5 | 37.4 | 37.4 | 37.4 | 36.5 | 39.2 | 38.7 |
| 6 | 49.5 | 49.5 | 49.5 | 47.3 | 51.8 | 49.5 |
| 8 | 77.4 | 77.4 | 77.4 | 85.5 | 90 | 84.2 |
| 10 | 110.3 | 110.3 | 110.3 | 124.7 | 130.5 | 120.6 |
| 12 | 146.7 | 146.7 | 146.7 | 166 | 186.8 | 167.4 |
| 14 | 180 | 180 | 180 | 186.8 | 234 | 252.9 |
| 16 | 206.6 | 206.6 | 206.6 | 219.6 | 278.6 | 308.3 |
| 18 | 291.2 | 291.2 | 291.2 | 301.5 | 396 | 415.8 |
| 20 | 356.4 | 356.4 | 356.4 | 390.6 | 498.2 | 523.8 |
| 24 | 666 | 666 | 666 | 746.6 | 944.6 | 948.2 |
ASME B16.5 Class 1500 Flanges Weight Chart (in kilograms)
| NPS | Slip On | Thd | Socket Weld | Lap Joint | Blind | Weld Neck |
| 1/2 | 2.7 | 2.7 | 2.7 | 2.7 | 1.8 | 3.2 |
| 3/4 | 2.7 | 2.7 | 2.7 | 2.7 | 2.7 | 3.2 |
| 1 | 3.6 | 3.6 | 3.6 | 3.6 | 4.1 | 4.1 |
| 11/4 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 |
| 11/2 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 |
| 2 | 11.3 | 11.3 | 11.3 | 11.3 | 11.3 | 11.3 |
| 21/2 | 16.2 | 16.2 | 16.2 | 15.8 | 15.8 | 16.2 |
| 3 | 21.6 | 21.6 | 21.6 | 21.2 | 21.6 | 21.6 |
| 4 | 32.9 | 32.9 | 32.9 | 33.8 | 32.9 | 32.9 |
| 5 | 59.4 | 59.4 | 59.4 | 63 | 63 | 59.4 |
| 6 | 74.3 | 74.3 | 74.3 | 76.5 | 72 | 74.3 |
| 8 | 117 | 117 | 117 | 128.7 | 135.9 | 123.8 |
| 10 | 196.2 | 196.2 | 196.2 | 218.3 | 229.5 | 204.8 |
| 12 | 300.2 | 300.2 | 300.2 | 337.1 | 348.8 | 310.5 |
| 14 | 423 | 423 | 423 | 400.5 | 438.8 | 423 |
| 16 | 562.5 | 562.5 | 562.5 | 562.5 | 585 | 562.5 |
| 18 | 731.3 | 731.3 | 731.3 | 663.8 | 787.5 | 731.3 |
| 20 | 922.5 | 922.5 | 922.5 | 798.8 | 1001 | 922.5 |
| 24 | 1271 | 1271 | 1271 | 1271 | 1631 | 1496 |
ASME B16.5 Class 2500 Flanges Weight Chart (in kilograms)
| NPS | Slip On | Thd | Socket Weld | Lap Joint | Blind | Weld Neck |
| 1/2 | … | 3.2 | … | 3.2 | 3.2 | 3.6 |
| 3/4 | … | 4.1 | … | 3.6 | 4.5 | 4.1 |
| 1 | … | 5.4 | … | 5.4 | 5.4 | 5.9 |
| 11/4 | … | 8.1 | … | 7.7 | 8.1 | 9 |
| 11/2 | … | 11.3 | … | 10.8 | 11.3 | 12.6 |
| 2 | … | 17.1 | … | 16.7 | 17.6 | 18.9 |
| 21/2 | … | 24.8 | … | 23.9 | 25.2 | 23.4 |
| 3 | … | 37.4 | … | 36 | 38.7 | 42.3 |
| 4 | … | 57.2 | … | 54.9 | 59.9 | 65.7 |
| 5 | … | 94.5 | … | 91.8 | 100.4 | 109.8 |
| 6 | … | 145.4 | … | 141.3 | 155.3 | 170.1 |
| 8 | … | 218.3 | … | 211.9 | 239.8 | 259.2 |
| 10 | … | 416.3 | … | 403.7 | 461.3 | 480.6 |
| 12 | … | 585 | … | 567.9 | 658.8 | 723.6 |
SSM is a trusted manufacturer of ASME B16.5 flanges, offering high-quality products designed to meet the highest industry standards. As a reliable supplier, we provide a wide range of flange types including Slip-On, Threaded, Socket Weld, Lap Joint, Blind, and Weld Neck, all crafted with precision and durability. Whether you require flanges for industrial, commercial, or specialized applications, our team is committed to delivering exceptional service and ensuring your satisfaction. Contact us today to discuss your needs and discover how SSM can be your go-to supplier for top-quality ASME B16.5 flanges.
