Threaded Pipe Fittings
What are Threaded Pipe Fittings?
Threaded Pipe Fittings are forged components used to connect pipes and equipment by means of screw threads, providing a secure, leak-resistant joint in small-diameter, high-pressure piping systems. Unlike welded connections, threaded fittings do not require welding or heat, making them ideal for quick installation, dismantling, and repair.
These fittings are widely used in low to medium-pressure fluid systems, particularly where piping runs require frequent modifications or maintenance. Threaded fittings are available in a variety of types such as elbows, tees, unions, couplings, plugs, bushings, and more, typically produced from carbon steel, stainless steel, and alloy steel.
Key Features
Leak-Proof
Jointing
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Size | ½” to 6″ (custom sizes available) |
| Pressure Ratings | ANSI / ASME Class | Class 150, 300, 600, 900, 1500, 2500 |
| PN Ratings | PN6, PN10, PN16, PN25, PN40, PN64 | |
| Product Types | Threaded Elbows | 90°, 45°, Street Elbows |
| Threaded Tees | Equal, Reducing | |
| Threaded Sockets | Standard, Reducing | |
| Threaded Reducers | Concentric, Eccentric | |
| Threaded Unions | Standard, Heavy Duty | |
| Threaded Crosses | Equal, Reducing | |
| Material Options | Carbon Steel | ASTM A105, ASTM A350 LF2 |
| Stainless Steel | ASTM A182 F304, F316, F321, F347 | |
| Alloy Steel | ASTM A182 F5, F9, F11, F22 | |
| Brass | ASTM B16 | |
| Other Alloys | Monel, Inconel, Titanium | |
| Standards & Certifications | ASTM | ASTM A105, ASTM A182, ASTM B366 |
| ASME / ANSI | ASME B16.11, ANSI B16.11 | |
| MSS | MSS SP-79, MSS SP-83 | |
| European Standards | EN 10222, EN 10204 | |
| Certifications | ISO 9001, PED 2014/68/EU, NACE MR0175, CE Marked | |
| Design Features | Thread Type | NPT, BSP, BSPT, PT |
| End Connections | Threaded (Tapered or Parallel) | |
| Pressure Class | 2000#, 3000#, 6000#, 9000# | |
| Tolerance | Thread Tolerance | As per ASME B1.1, ISO 7-1 |
| Coating & Surface Finish | Anti-Corrosion Coating | Zinc Plated, Hot Dip Galvanized, Stainless Steel Finish |
| Surface Finish | Mill Finish, Pickled, Polished, Bead Blasted | |
| Testing & Inspection | Pressure Testing | Hydrostatic, Pneumatic |
| Non-Destructive Testing | Radiography (RT), Ultrasonic (UT), Magnetic Particle (MPI), Dye Penetrant (DPT) | |
| Destructive Testing | Tensile, Hardness, Impact, Elongation |
Dimensions
| Fitting Type | Nominal Size (NPS) | Thread Size (BSP/NPT) | Outside Diameter (OD) | Length (L) | End Connections | Weight per Piece |
|---|---|---|---|---|---|---|
| Threaded Elbow (90°) | ½” – 6″ | NPT/BSP | 21.3 mm – 168.3 mm | 50 mm – 150 mm | Threaded (BSPT, NPT) | 50g – 700g |
| Threaded Tee | ½” – 6″ | NPT/BSP | 21.3 mm – 168.3 mm | 75 mm – 250 mm | Threaded (BSPT, NPT) | 100g – 1000g |
| Threaded Socket | ½” – 6″ | NPT/BSP | 21.3 mm – 168.3 mm | 30 mm – 100 mm | Threaded (BSPT, NPT) | 50g – 500g |
| Threaded Reducer | ½” – 6″ | NPT/BSP | 21.3 mm – 168.3 mm | 50 mm – 200 mm | Threaded (BSPT, NPT) | 70g – 800g |
| Threaded Union | ½” – 6″ | NPT/BSP | 21.3 mm – 168.3 mm | 80 mm – 250 mm | Threaded (BSPT, NPT) | 150g – 1200g |
| Threaded Cross | ½” – 6″ | NPT/BSP | 21.3 mm – 168.3 mm | 75 mm – 250 mm | Threaded (BSPT, NPT) | 100g – 900g |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 350 – 750 | MPa (Carbon Steel, Stainless Steel, Alloy Steel) |
| Yield Strength | 200 – 450 | MPa |
| Hardness | 100 – 250 | HB (Brinell) |
| Elongation | ≥ 15 – 30 | % |
| Density | 7.8 – 8.0 g/cm³ (Carbon Steel), 7.9 – 8.1 g/cm³ (Stainless Steel) | – |
| Impact Toughness | ≥ 20 – 70 | J (Charpy, grade-dependent) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 200 – 450 | MPa |
| Corrosion Resistance | Good to Excellent (SS > CS > Alloy Steel) | – |
| Thermal Conductivity | 20 – 45 | W/m·K |
| Coefficient of Thermal Expansion | 10 – 15 ×10⁻⁶ | /°C (depending on material grade) |
| Yield Ratio (YS/UTS) | 0.40 – 0.65 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 100 – 250 | HB |
| Surface Finish | Zinc-Plated, Galvanized, Stainless Steel Finish | – |
| Welding Type | Not Applicable (Threaded Connection) | – |
| Operating Temperature Range | -40 to 450 | °C (material-dependent) |
| Pressure Rating | Class 150, 300, 600, 900, 1500, 2500 | ASME B16.11, ANSI B16.11 |
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 |
Do you have questions?
Are threaded fittings suitable for high-pressure applications?
Can I reuse threaded fittings after dismantling?
What’s the difference between NPT and BSP threads?
Do you offer fittings with special coatings or finishes?
