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 |
Manufacturing Process:
The flanges covered by ASTM A182 are typically produced by forging or rolling methods.These processes optimize the material’s mechanical properties for the intended service conditions.
Pressure and Temperature Ratings:
ASTM A182 Stainless Steel Flanges are designed to meet specific and temperature requirements. The standard provides various classes (Class 150, Class 300, Class 600, etc.) to indicate the pressure-temperature rating of the flanges.
Testing and Quality Control:
The specification outlines the testing procedures and quality control measures to ensure that the flanges meet the required standards. To achieve this, it includes common tests such as chemical composition analysis, mechanical testing, and non-destructive testing methods.
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 |
Key Features:
✔ Threaded Connection – No welding required, making it easy to install and remove.
✔ Used for Low-Pressure Systems – Typically used in Class 150 and Class 300 pressure ratings.
✔ Ideal for Small Diameter Pipes – Usually used for NPS 2″ and below.
✔ Leak Prevention – Can be sealed with thread sealants or Teflon tape.
✔ Corrosion Resistance – Available in stainless steel and alloy steel for different environments.
Dimensions of ASME B16.5 Threaded Flange
ASME B16.5 specifies specific temperature requirements for threaded flanges. 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 Flange Working Pressure
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 Types 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. Specifically, the raised face sealing surface features a raised annular table on the flange’s sealing surface. As a result, this structure increases the reliability of the seal to a certain extent.
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 |
Marking and Packing
We package our products carefully to ensure they remain undamaged during transit. For exports, we use standard export packaging in wooden cases. We mark all pipes with the grade, lot number, size, degree, and our trademark. On special requests we can also, make custom marking on our products.
Wooden Boxes
Wooden Pallets
Shrink-Wrapped
Carton Boxes
Wooden Boxes
Applications:
✅ Plumbing & Water Systems – Easy disassembly for maintenance.
✅ Oil & Gas Pipelines – Low-pressure gas and liquid transport.
✅ Chemical Processing – Used where welding is restricted.
✅ Fire Protection Systems – Threaded connections allow for quick installation.
We are professional in manufacturing and exporting flanges in various materials.
