Threaded Flanges
What are Threaded Flanges?
Threaded Flanges are pipe connection components that feature a tapered internal thread, allowing pipes to be screwed directly into the flange without the need for welding. These flanges are ideal for low-pressure, non-critical applications or in environments where welding is hazardous or impractical.
Asiad Steel Industries is a prominent manufacturer and supplier of premium-quality Threaded Flanges in stainless steel, carbon steel, and special alloys for various global industries.
Key Features
Strong &
Reliable Connection
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Description / Options |
|---|---|---|
| Size Range | Nominal Pipe Size (NPS) | ½” to 24” (DN15 – DN600), Custom sizes available on request |
| End-to-End Dimensions | Standard per ASME/ANSI, tolerances ±1% | |
| Pressure Class | ANSI / ASME Class | 150#, 300#, 600#; Other classes |
| PN Rating | PN6, PN10, PN16, PN25, PN40 | |
| Thread Types | Standard Threads | NPT, BSP, BSPT, ISO |
| Optional Custom Threads | Metric, UNF/UNC threads | |
| Facing Types | Standard Flange Faces | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Optional Faces | Tongue & Groove, Male-Female | |
| Materials | Carbon Steel | CS A105, CS A350 LF2 |
| Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321 | |
| Duplex / Super Duplex | Duplex 2205, Super Duplex 2507 | |
| Alloy Steel & Specialty Metals | Inconel, Monel, Titanium, Nickel Alloys | |
| Manufacturing Process | Forging & Heat Treatment | Forged, Annealed, Normalized, Quenched & Tempered |
| Machining & Finishing | CNC Machined, Polished, Passivated | |
| Welding Capability | Butt Weld, Socket Weld options available | |
| Standards & Compliance | ASME / ANSI | ASME B16.5, B16.47 |
| European Standards | EN 1092-1, BS 4504 | |
| Certifications | ISO 9001, PED 2014/68/EU, NACE MR0175 | |
| Coating & Surface Finish | Standard Coating | Rust preventive, Black oxide, Hot-dip galvanized |
| Optional Coatings | Epoxy, PTFE, Polyurethane | |
| Surface Finish | Machined, Polished, Passivated | |
| Connection Types | Mechanical Connections | Threaded, Lap Joint, Slip-On, Blind |
| Welding Connections | Butt Weld, Socket Weld | |
| Testing & Inspection | Pressure Testing | Hydrostatic, Pneumatic |
| Nondestructive Testing (NDT) | RT, UT, PT, MT | |
| Dimensional & Visual Inspection | Full inspection per ASME / EN standards | |
| Applications | Industries | Oil & Gas, Petrochemical, Water Treatment, Power, Shipbuilding, Chemical |
| Fluid Types | Water, Oil, Gas, Steam, Corrosive Liquids | |
| Tolerance & Traceability | Dimensional Tolerance | ±1% standard; ±0.5% for critical projects |
| Pressure & Rating Tolerance | As per ANSI/ASME Class standards | |
| Material Traceability | Mill Test Certificates (MTC) for all batches |
Class 400 (PN 68)
| NPS / DN | Drilling (mm) | No. of Holes | Dia. of Holes (mm) | Dia. of Bolt Circle (mm) | Bolt Dia. (Inches) | Length at Base (mm) | Length at Chamfer (mm) | Approximate Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| 4” (DN100) | 8 | 1 | 7.88 / 200.0 | 7/8 | 5.5 / 140 | 6.0 / 153 | 5.75 / 146.1 | 0.37 |
| 5” (DN125) | 8 | 1 | 9.25 / 235.0 | 7/8 | 5.75 / 146 | 6.25 / 159 | 7.0 / 177.8 | 0.45 |
| 6” (DN150) | 12 | 1 | 10.62 / 269.7 | 7/8 | 6.25 / 159 | 6.5 / 165 | 8.12 / 206.4 | 0.61 |
| 8” (DN200) | 12 | 1.12 / 29 | 13.0 / 330.2 | 1 | 6.75 / 172 | 7.25 / 185 | 10.25 / 260.4 | 0.90 |
| 10” (DN250) | 16 | 1.25 / 32 | 15.25 / 387.3 | 1 1/8 | 7.5 / 191 | 8.0 / 204 | 12.62 / 320.7 | 1.35 |
| 12” (DN300) | 16 | 1.38 / 35 | 17.75 / 450.8 | 1 1/4 | 8.0 / 205 | 8.5 / 216 | 14.75 / 374.6 | 1.89 |
Class 600 (PN 100)
| NPS / DN | Drilling (mm) | No. of Holes | Dia. of Holes (mm) | Dia. of Bolt Circle (mm) | Bolt Dia. (Inches) | Length at Base (mm) | Length at Welding (mm) | Approximate Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| 4” (DN100) | 8 | 1 | 1.00 / 26 | 8.50 / 216 | 7/8 | 6.00 / 152 | 6.5 / 165 | 0.44 |
| 5” (DN125) | 8 | 1 | 1.13 / 29 | 10.50 / 267 | 1 | 5.50 / 140 | 7.00 / 178 | 0.52 |
| 6” (DN150) | 12 | 1.13 / 29 | 11.50 / 292 | 1 | 7.00 / 178 | 7.5 / 191 | 8.75 / 222 | 0.95 |
| 8” (DN200) | 12 | 1.25 / 32 | 13.75 / 349 | 1 1/8 | 7.75 / 197 | 8.25 / 210 | 10.75 / 273 | 1.29 |
| 10” (DN250) | 16 | 1.38 / 35 | 17.00 / 432 | 1 1/4 | 8.75 / 222 | 9.25 / 235 | 13.50 / 343 | 1.80 |
| 12” (DN300) | 20 | 1.38 / 35 | 19.25 / 489 | 1 1/4 | 9.00 / 229 | 9.5 / 241 | 15.75 / 400 | 2.45 |
Class 900 (PN 150)
| NPS / DN | Drilling (mm) | No. of Holes | Dia. of Holes (mm) | Dia. of Bolt Circle (mm) | Bolt Dia. (Inches) | Length at Base (mm) | Length at Welding (mm) | Approximate Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| 3” (DN80) | 8 | 1.00 | 7.50 | 7/8 | 6.0 | 6.5 | 5.00 | 0.34 |
| 4” (DN100) | 8 | 1.25 | 9.25 | 1 1/8 | 7.00 | 7.5 | 6.25 | 0.57 |
| 5” (DN125) | 8 | 1.38 | 11.00 | 1 1/4 | 7.50 | 8.00 | 7.50 | 0.68 |
| 6” (DN150) | 12 | 1.25 | 12.50 | 1 1/8 | 7.75 | 8.25 | 9.25 | 1.12 |
| 8” (DN200) | 12 | 1.50 | 15.50 | 1 3/8 | 9.00 | 9.5 | 11.75 | 1.43 |
| 10” (DN250) | 16 | 1.50 | 18.50 | 1 3/8 | 9.5 | 10.0 | 14.50 | 1.77 |
Class 1500 (PN 250)
| NPS / DN | Drilling (mm) | No. of Holes | Dia. of Holes (mm) | Dia. of Bolt Circle (mm) | Bolt Dia. (Inches) | Length at Base (mm) | Length at Welding (mm) | Approximate Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| 1” (DN25) | 4 | 1.00 | 4.00 | 7/8 | 6.00 | 6.25 | 2.06 | 0.29 |
| 2” (DN50) | 8 | 1.00 | 6.50 | 7/8 | 6.00 | 6.50 | 4.12 | 0.60 |
| 3” (DN80) | 8 | 1.25 | 8.00 | 1 1/8 | 7.25 | 7.75 | 5.25 | 0.84 |
| 4” (DN100) | 8 | 1.38 | 9.50 | 1 1/4 | 8.00 | 8.50 | 6.38 | 1.05 |
| 5” (DN125) | 8 | 1.62 | 11.50 | 1 1/2 | 9.75 | 10.25 | 7.75 | 1.35 |
| 6” (DN150) | 12 | 1.50 | 12.50 | 1 3/8 | 10.50 | 11.00 | 9.00 | 1.72 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 485 – 750 | MPa (varies with CS, SS, Alloy Steel) |
| Yield Strength | 170 – 450 | MPa |
| Hardness | 120 – 200 | HB (Brinell) |
| Elongation | ≥ 20 – 30 | % |
| Density | 7.8 – 8.0 | g/cm³ |
| Impact Toughness | ≥ 27 – 70 | J (Charpy, depending on grade) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 200 – 400 | MPa |
| Corrosion Resistance | Good to Excellent (grade-dependent) | – |
| Thermal Conductivity | 15 – 50 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.45 – 0.65 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 120 – 200 | HB |
| Surface Finish | Serrated / Smooth / Stock Finish per ASME B16.5 | – |
| Thread Standards | NPT / BSP / BSPT | as per ASME B1.20.1 & ISO |
| Operating Temperature Range | -46 to 600 | °C (depends on material grade) |
| Pressure Rating | Class 150, 300, 600, 900, 1500 | ASME B16.5 Standards |
Chemical Composition
| Element | SS 304 (%) | SS 304L (%) | SS 316 (%) | SS 316L (%) |
|---|---|---|---|---|
| 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 |
| 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 |
| Iron (Fe) | Balance | Balance | Balance | Balance |
| Molybdenum (Mo) | — | — | 2.0 – 3.0 | 2.0 – 3.0 |
Applications of Threaded Flanges
Construction &
Infrastructure
Power Generation &
Energy Sector
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
Where are threaded flanges commonly used?
Are threaded flanges suitable for high-pressure pipelines?
What thread types are supported?
Do you offer flanges with special coatings?
