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ASME B16.5 Forged Flanges Complete Weight Comparison Chart (½" to 24")
Approximate weights for Weld Neck, Slip-On, Threaded, and Blind flanges in Kilograms (kg) and Pounds (lbs).
| NPS | Class 150 | Class 300 | Class 400 | Class 600 | Class 900 | Class 1500 | Class 2500 |
|---|---|---|---|---|---|---|---|
| 1/2" | 0.5 kg / 1.1 lbs | 0.7 kg / 1.5 lbs | 0.8 kg / 1.8 lbs | 0.8 kg / 1.8 lbs | 1.8 kg / 4.0 lbs | 1.8 kg / 4.0 lbs | 3.2 kg / 7.0 lbs |
| 3/4" | 0.7 kg / 1.5 lbs | 1.1 kg / 2.5 lbs | 1.3 kg / 2.9 lbs | 1.3 kg / 2.9 lbs | 2.7 kg / 6.0 lbs | 2.7 kg / 6.0 lbs | 3.6 kg / 8.0 lbs |
| 1" | 0.9 kg / 2.0 lbs | 1.4 kg / 3.0 lbs | 1.6 kg / 3.5 lbs | 1.6 kg / 3.5 lbs | 3.6 kg / 8.0 lbs | 3.6 kg / 8.0 lbs | 5.4 kg / 12.0 lbs |
| 1-1/4" | 1.2 kg / 2.7 lbs | 1.8 kg / 4.0 lbs | 2.2 kg / 4.9 lbs | 2.2 kg / 4.9 lbs | 4.5 kg / 10.0 lbs | 4.5 kg / 10.0 lbs | 8.2 kg / 18.0 lbs |
| 1-1/2" | 1.5 kg / 3.3 lbs | 2.7 kg / 6.0 lbs | 3.2 kg / 7.0 lbs | 3.2 kg / 7.0 lbs | 6.4 kg / 14.0 lbs | 6.4 kg / 14.0 lbs | 11.3 kg / 25.0 lbs |
| 2" | 2.3 kg / 5.0 lbs | 3.2 kg / 7.0 lbs | 4.1 kg / 9.0 lbs | 4.1 kg / 9.0 lbs | 11.3 kg / 25.0 lbs | 11.3 kg / 25.0 lbs | 18.1 kg / 40.0 lbs |
| 2-1/2" | 3.6 kg / 8.0 lbs | 4.5 kg / 10.0 lbs | 5.9 kg / 13.0 lbs | 5.9 kg / 13.0 lbs | 15.9 kg / 35.0 lbs | 15.9 kg / 35.0 lbs | 27.2 kg / 60.0 lbs |
| 3" | 4.1 kg / 9.0 lbs | 6.8 kg / 15.0 lbs | 8.6 kg / 19.0 lbs | 8.6 kg / 19.0 lbs | 14.1 kg / 31.0 lbs | 21.8 kg / 48.0 lbs | 41.7 kg / 92.0 lbs |
| 3-1/2" | 5.4 kg / 12.0 lbs | 8.2 kg / 18.0 lbs | 10.4 kg / 23.0 lbs | 11.3 kg / 25.0 lbs | -- | -- | -- |
| 4" | 5.9 kg / 13.0 lbs | 10.9 kg / 24.0 lbs | 15.0 kg / 33.0 lbs | 18.6 kg / 41.0 lbs | 23.6 kg / 52.0 lbs | 33.1 kg / 73.0 lbs | 63.5 kg / 140.0 lbs |
| 5" | 6.8 kg / 15.0 lbs | 14.5 kg / 32.0 lbs | 20.9 kg / 46.0 lbs | 30.8 kg / 68.0 lbs | 39.5 kg / 87.0 lbs | 59.0 kg / 130.0 lbs | 113.4 kg / 250.0 lbs |
| 6" | 8.6 kg / 19.0 lbs | 17.7 kg / 39.0 lbs | 27.7 kg / 61.0 lbs | 36.3 kg / 80.0 lbs | 51.7 kg / 114.0 lbs | 72.6 kg / 160.0 lbs | 158.8 kg / 350.0 lbs |
| 8" | 13.6 kg / 30.0 lbs | 26.3 kg / 58.0 lbs | 43.1 kg / 95.0 lbs | 54.4 kg / 120.0 lbs | 88.9 kg / 196.0 lbs | 127.0 kg / 280.0 lbs | 272.2 kg / 600.0 lbs |
| 10" | 19.5 kg / 43.0 lbs | 36.7 kg / 81.0 lbs | 61.7 kg / 136.0 lbs | 86.2 kg / 190.0 lbs | 131.5 kg / 290.0 lbs | 208.7 kg / 460.0 lbs | 476.3 kg / 1050.0 lbs |
| 12" | 29.0 kg / 64.0 lbs | 52.2 kg / 115.0 lbs | 84.4 kg / 186.0 lbs | 102.5 kg / 226.0 lbs | 181.4 kg / 400.0 lbs | 308.4 kg / 680.0 lbs | 748.4 kg / 1650.0 lbs |
| 14" | 38.6 kg / 85.0 lbs | 74.8 kg / 165.0 lbs | 114.3 kg / 252.0 lbs | 138.3 kg / 305.0 lbs | 235.9 kg / 520.0 lbs | 430.9 kg / 950.0 lbs | -- |
| 16" | 47.6 kg / 105.0 lbs | 95.3 kg / 210.0 lbs | 154.2 kg / 340.0 lbs | 195.0 kg / 430.0 lbs | 308.4 kg / 680.0 lbs | 589.7 kg / 1300.0 lbs | -- |
| 18" | 59.0 kg / 130.0 lbs | 122.5 kg / 270.0 lbs | 190.5 kg / 420.0 lbs | 254.0 kg / 560.0 lbs | 426.4 kg / 940.0 lbs | 793.8 kg / 1750.0 lbs | -- |
| 20" | 74.8 kg / 165.0 lbs | 156.5 kg / 345.0 lbs | 244.9 kg / 540.0 lbs | 326.6 kg / 720.0 lbs | 567.0 kg / 1250.0 lbs | 1043.3 kg / 2300.0 lbs | -- |
| 24" | 104.3 kg / 230.0 lbs | 226.8 kg / 500.0 lbs | 349.3 kg / 770.0 lbs | 462.7 kg / 1020.0 lbs | 861.8 kg / 1900.0 lbs | 1632.9 kg / 3600.0 lbs | -- |
📌 Engineering Specification Notes
1. Standard Compliance: All dimensions and tolerances conform to ASME B16.5 / ANSI B16.5 standards.
2. Material Specifications: Available in ASTM A105 (Carbon Steel), A350 LF2 (Low Temp), A182 F304/L, F316/L (Stainless Steel), and High-Nickel Alloy steels.
3. Flange Facings: Supplied standard with 1/16" Raised Face (RF) for Class 150 and 300; 1/4" Raised Face (RF) for Class 400 through 2500. Ring Type Joint (RTJ) and Flat Face (FF) available upon request.
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