ASA Flanges
What are ASA Flanges?
ASA Flanges are standardized pipe flanges designed according to the American Standards Association (ASA), now recognized as ANSI/ASME B16.5. These flanges are widely used in piping systems to connect pipes, valves, pumps, and other equipment, ensuring secure, leak-proof, and pressure-resistant joints.
Asiad Steel Industries is a trusted manufacturer and supplier of ASA 150# and 300# flanges in stainless steel, carbon steel, alloy steel, and special alloys, strictly adhering to international standards.
Key Features
Strong &
Reliable Connection
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Pipe Size (NPS) | ½” to 24” (DN15 – DN600) |
| Pressure Ratings | ASA Standards | ASA 150#, ASA 300# |
| Flange Face Types | Standard Faces | Raised Face (RF), Flat Face (FF) |
| Connection Types | Joining | Weld Neck Flanges, Slip-On, Socket Weld Flanges, Blind, Threaded Flanges |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L |
| Carbon Steel | CS A105, CS A350 LF2 | |
| Alloy & Duplex | Inconel, Monel, Duplex 2205, Super Duplex 2507 | |
| Standards & Certifications | ASA / ANSI | ASA B16.5 (150# & 300#) |
| Quality | ISO 9001, NACE MR0175, PED 2014/68/EU |
ASA 150# Flanges Dimensions (in mm)
| NPS (inches) | OD (mm) | Bolt Circle (mm) | No. of Bolts | Bolt Hole Dia. (mm) | Flange Thickness (mm) | Raised Face (mm) | Bore (mm) |
|---|---|---|---|---|---|---|---|
| ½” | 89 | 60.3 | 4 | 16 | 11.2 | 1.6 | 15 |
| ¾” | 98.6 | 69.9 | 4 | 16 | 12.7 | 1.6 | 20 |
| 1” | 108 | 79.4 | 4 | 16 | 12.7 | 1.6 | 25 |
| 1 ½” | 127 | 98.4 | 4 | 16 | 14.3 | 1.6 | 40 |
| 2” | 152 | 120.6 | 4 | 19 | 16 | 1.6 | 50 |
| 3” | 191 | 152.4 | 4 | 19 | 19 | 1.6 | 80 |
| 4” | 229 | 190.5 | 8 | 19 | 24 | 1.6 | 100 |
| 6” | 279 | 241.3 | 8 | 22 | 25.4 | 1.6 | 150 |
| 8” | 343 | 298.5 | 8 | 22 | 29.9 | 1.6 | 200 |
| 10” | 406 | 362 | 12 | 25 | 30.2 | 1.6 | 250 |
| 12” | 483 | 431.8 | 12 | 25 | 31.8 | 1.6 | 300 |
ASA 300# Flanges Dimensions (in mm)
| NPS (inches) | OD (mm) | Bolt Circle (mm) | No. of Bolts | Bolt Hole Dia. (mm) | Flange Thickness (mm) | Raised Face (mm) | Bore (mm) |
|---|---|---|---|---|---|---|---|
| ½” | 95 | 66.7 | 4 | 16 | 16 | 1.6 | 15 |
| ¾” | 117 | 82.6 | 4 | 19 | 19 | 1.6 | 20 |
| 1” | 124 | 88.9 | 4 | 19 | 20.6 | 1.6 | 25 |
| 1 ½” | 156 | 114.3 | 4 | 19 | 22.4 | 1.6 | 40 |
| 2” | 165 | 127 | 8 | 19 | 24.1 | 1.6 | 50 |
| 3” | 210 | 168.3 | 8 | 22 | 28.4 | 1.6 | 80 |
| 4” | 254 | 200 | 8 | 22 | 31.8 | 1.6 | 100 |
| 6” | 318 | 269.9 | 12 | 22 | 37.3 | 1.6 | 150 |
| 8” | 381 | 330.2 | 12 | 25 | 41.1 | 1.6 | 200 |
| 10” | 445 | 387.3 | 16 | 29 | 47.8 | 1.6 | 250 |
| 12” | 521 | 451.1 | 16 | 29 | 52.4 | 1.6 | 300 |
Mechanical Properties
| Property | ASA 150# Flanges | ASA 300# Flanges | Unit / Standard |
|---|---|---|---|
| Tensile Strength | 485 – 620 | 515 – 620 | MPa |
| Yield Strength | 170 – 250 | 200 – 275 | MPa |
| Hardness | 120 – 160 | 130 – 170 | HB (Brinell) |
| Elongation | ≥ 22 – 30 | ≥ 20 – 28 | % |
| Density | 7.85 | 7.85 | g/cm³ |
| Impact Toughness | ≥ 27 – 60 | ≥ 27 – 70 | J (Charpy) |
| Modulus of Elasticity (E) | ~200 | ~200 | GPa |
| Fatigue Strength | ~200 | ~250 | MPa |
| Corrosion Resistance | Good to Excellent (SS > CS) | Good to Excellent (SS > CS) | – |
| Thermal Conductivity | 15 – 45 | 15 – 45 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 17 ×10⁻⁶ | 11 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.35 – 0.50 | 0.40 – 0.55 | – |
| Poisson’s Ratio | 0.27 – 0.30 | 0.27 – 0.30 | – |
| Brinell Hardness Range | 120 – 160 | 130 – 170 | HB |
| Surface Finish | Serrated / Stock / Smooth (ASA Standard) | Serrated / Stock / Smooth (ASA Standard) | – |
| Operating Temperature Range | -29 to 425 | -29 to 600 | °C |
| Pressure Rating | 285 psi @ 100°F | 740 psi @ 100°F | ASME / ASA Standard |
Chemical Composition
| Element | SS 304 (%) | SS 304L (%) | SS 316 (%) | SS 316L (%) |
|---|---|---|---|---|
| Carbon (C) | ≤ 0.08 | ≤ 0.03 | ≤ 0.08 | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 |
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 8.0 – 10.5 | 8.0 – 12.0 | 10.0 – 14.0 | 10.0 – 14.0 |
| Molybdenum (Mo) | — | — | 2.0 – 3.0 | 2.0 – 3.0 |
| Iron (Fe) | Balance | Balance | Balance | Balance |
Applications of ASA Flanges
Construction &
Infrastructure
Power Generation &
Energy Sector
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What is the difference between ASA 150# and ASA 300# flanges?
Are ASA flanges the same as ANSI flanges?
What materials are ASA flanges available in?
Can ASA flanges be customized?
