ASTM A182 threaded flange is a flange manufactured according to A182 standard, and its connection method is threaded connection. It is a commonly used connector in pipeline systems, used to connect pipelines, valves, pumps and other equipment, so that fluids can be smoothly transmitted within the system.
ASTM A182 is the standard for forged or rolled alloy steel and stainless steel pipe fittings, flanges, valves, accessories for use in high temperature environments. This standard covers a variety of material grades, such as F304, F316, F321, F11, F22, etc. The specific material selection depends on the application environment.
Specification of Forged Threaded Flanges
| Size Range | 1/2″ – 24″ / DN15 – DN600 |
| Pressure Rating | Class 150, 300, 600, 900, 1500, 2500lb |
| Standard | ASME B16.5, EN1092-1 |
| Alloy Steel | ASTM A182 F11 / 12 / 5 / 9 / 91 / 92 |
| Stainless Steel | ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904L |
| Duplex Stainless Steel | ASTM A182 F51, F53, F44 |
Common Materials
| Material Grade | Type | Characteristics |
| F304/F304L | Stainless Steel | General corrosion resistance for industrial use |
| F316/F316L | Stainless Steel | Molybdenum-enhanced corrosion resistance, suitable for marine and chemical applications |
| F11/F22 | Alloy Steel (Cr-Mo) | Suitable for high-temperature and high-pressure environments |
| F5/F9 | Alloy Steel | Used in petroleum and gas industries |
Dimensions of ASME B16.5 Flange
ASME B16.5 flanges are designed to meet specific temperature requirements. The standard provides various grades including 150, 300, 400, 600, 900, 1500, 2500 to indicate the pressure temperature rating of the flange.
Class 300 Threaded Flange
| Nominal Pipe Size |
A | B | C | D | E | F | G | H | I | J | Weight | |
| mm | Holes | mm | mm | kg/ piece |
||||||||
| 1/2 | 21.30 | 95.20 | 23.60 | 14.20 | 22.30 | 15.70 | 38.10 | 35.00 | 4 | 15.70 | 66.55 | 0.64 |
| 3/4 | 26.70 | 117.3 | 29.00 | 15.70 | 25.40 | 15.70 | 47.70 | 42.90 | 4 | 19.00 | 82.50 | 1.12 |
| 1 | 33.40 | 123.9 | 35.80 | 17.50 | 26.90 | 17.50 | 53.80 | 50.80 | 4 | 19.00 | 88.90 | 1.36 |
| 11/4 | 42.20 | 133.3 | 44.40 | 19.00 | 26.90 | 20.60 | 63.50 | 63.50 | 4 | 19.00 | 98.50 | 1.68 |
| 11/2 | 48.30 | 155.4 | 50.50 | 20.60 | 30.20 | 22.30 | 69.85 | 73. 15 | 4 | 22.30 | 114.3 | 2.49 |
| 2 | 60.30 | 165.1 | 63.50 | 22.30 | 33.20 | 28.40 | 84.00 | 91.90 | 8 | 19.00 | 127.0 | 2.87 |
| 21/2 | 73.00 | 190.5 | 76.20 | 25.40 | 38. 10 | 31.70 | 100.0 | 104.6 | 8 | 22.30 | 149.3 | 4.32 |
| 3 | 88.90 | 209.5 | 92.20 | 28.40 | 42.90 | 31.70 | 117.3 | 127.0 | 8 | 22.30 | 168.1 | 5.85 |
| 31/2 | 101.6 | 228.6 | 104.9 | 30.20 | 44.40 | 36.50 | 133.3 | 139.7 | 8 | 22.30 | 184.1 | 7.34 |
| 4 | 114.3 | 254.0 | 117.6 | 31.70 | 47.70 | 36.50 | 146.0 | 157.2 | 8 | 22.30 | 200.1 | 9.61 |
| 5 | 141.3 | 279.4 | 144.5 | 35.00 | 50.80 | 42.90 | 177.8 | 185.7 | 8 | 22.30 | 234.9 | 12.3 |
| 6 | 168.3 | 317.5 | 171.4 | 36.50 | 52.30 | 45.90 | 206.2 | 215.9 | 12 | 22.30 | 269.7 | 15.6 |
| 8 | 219.1 | 381.0 | 222.2 | 41.10 | 61.90 | 50.80 | 260.3 | 269.7 | 12 | 25.40 | 330.2 | 24.2 |
| 10 | 273.0 | 444.5 | 276.3 | 47.70 | 66.55 | 55.60 | 320.5 | 323.9 | 16 | 28.40 | 387.3 | 34.1 |
| 12 | 323.8 | 520.7 | 328.7 | 50.80 | 73. 15 | 60.45 | 374.6 | 381.0 | 16 | 31.70 | 450.8 | 49.8 |
| 14 | 355.6 | 584.2 | 360.4 | 53.80 | 76.20 | 63.50 | 425.4 | 412.7 | 20 | 31.70 | 514.3 | 69.9 |
| 16 | 406.4 | 647.7 | 411.2 | 57.15 | 82.50 | 68.30 | 482.6 | 469.9 | 20 | 35.00 | 571.5 | 88.1 |
| 18 | 457.2 | 711.2 | 462.0 | 60.45 | 88.90 | 69.85 | 533.4 | 533.4 | 24 | 35.00 | 628.6 | 109 |
| 20 | 508.0 | 774.7 | 512.8 | 63.50 | 95.20 | 73.15 | 587.2 | 584.2 | 24 | 35.00 | 685.8 | 134 |
| 24 | 609.6 | 914.4 | 614.4 | 69.85 | 106.4 | 82.50 | 701.5 | 692.2 | 24 | 41.10 | 812.8 | 201 |
ASTM A182 Threaded Flanges Working Pressure Classs
ANSI Flanges: Class 150#, 300#, 600#, 900#, 1500#, 2500#.
API Flanges: Class 75, 150, 300, 600, 900.
JIS Flanges: JIS B2220 5K, 10K, 16K, 20K, 30K
DIN Flanges: 6 Bar, 10 Bar, 16 Bar, 25 Bar, 40 Bar.
BS 4504 Flanges: PN10, PN16
| TEMP. C | 150# | 300# | 400# | 600# | 900# | 1500# | 2500# |
| -29 to 38 | 15.9 | 41.4 | 55.2 | 82.7 | 124.1 | 206.8 | 344.7 |
| 50 | 15.3 | 40 | 53.4 | 80 | 120.1 | 200.1 | 333.5 |
| 100 | 13.3 | 34.8 | 46.4 | 69.6 | 104.4 | 173.9 | 289.9 |
| 150 | 12 | 31.4 | 41.9 | 62.8 | 94.2 | 157 | 261.6 |
| 200 | 11.2 | 29.2 | 38.9 | 58.3 | 87.5 | 145.8 | 243 |
| 250 | 10.5 | 27.5 | 36.6 | 54.9 | 82.4 | 137.3 | 228.9 |
| 300 | 10 | 26.1 | 34.8 | 52.1 | 78.2 | 130.3 | 217.2 |
| 325 | 9.3 | 25.5 | 34 | 51 | 76.4 | 127.4 | 212.3 |
| 350 | 8.4 | 25.1 | 33.4 | 50.1 | 75.2 | 125.4 | 208.9 |
| 375 | 7.4 | 24.8 | 33 | 49.5 | 74.3 | 123.8 | 206.3 |
| 400 | 6.5 | 24.3 | 32.4 | 48.6 | 72.9 | 121.5 | 202.5 |
| 425 | 5.5 | 23.9 | 31.8 | 47.7 | 71.6 | 119.3 | 198.8 |
| 450 | 4.6 | 23.4 | 31.2 | 46.8 | 70.2 | 117.1 | 195.1 |
Sealing Surface Type of ASTM A182 Threaded Flange
The sealing surface types of ASTM A182 threaded flanges include raised face (RF),Flat Face Full Face (FF), Male Face and Female Face (MFM), tongue-and-groove face (TG), and ring joint face (RJ).
The most commonly used sealing surface of ASTM A182 threaded flanges is the raised face. The raised face sealing surface has a raised annular table on the sealing surface of the flange. This structure increases the reliability of the seal to a certain extent. It is widely used in various medium and low pressure media pipeline systems, including general media transportation pipelines in chemical, petroleum and other industries.
Comparison with Other Flange Types
| Flange Type | Connection Method | Pressure Suitability | Welding Required | Typical Applications |
| Threaded Flange | Screwed connection | Low pressure (150#, 300#) | ❌ No welding | Small pipes, hazardous areas |
| Slip-On Flange | Fillet welded | Low to medium pressure | ✅ Yes | Water and wastewater systems |
| Weld Neck Flange | Butt-welded | High pressure | ✅ Yes | High-temperature, high-pressure applications |
| Blind Flange | No bore (sealing flange) | High pressure | ❌ No welding | Pipe end closures |
| Socket Weld Flange | Socket welded | Medium to high pressure | ✅ Yes | Small-diameter, high-pressure pipes |
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