Pipe Fittings Suppliers
Robust Special Metals is a trusted supplier of flanges for industries worldwide. We provide strong, reliable, and high-quality steel flanges that are used in piping systems across oil & gas, chemical plants, power stations, shipbuilding, and many more industries.
What are Pipe Fittings?
Pipe fittings are essential parts of any piping system because they connect pipes and guide how fluids or gases move. They make it possible to join pipes of the same or different sizes, change the direction of flow, split one line into two or close an unused opening. Common fittings include elbows that turn flow around corners, tees that create branch lines, reducers that shift from a large to a small pipe, couplings and unions that join sections, and caps or plugs that seal the ends. Without fittings, pipelines would be rigid and hard to build or repair. These components also help systems handle pressure, reduce leaks, and improve safety.
Common Applications of Buttweld Fittings
Flanges are often used with fittings and gaskets to make a tight joint. The fittings help guide or change the flow, and the flanges are the points that connect everything together. When used this way, the system stays strong but can still be taken apart when needed.
Common Applications of Pipe Flanges
Buttweld fittings join pipes into one continuous line. They create strong, leak-free joints that last under pressure. Their smooth design also improves flow and reduces wear, making them reliable across many industries.
Plumbing & Drainage
Buttweld fittings are used in water lines in homes, buildings and cities because they make strong, leak-resistant joints. They also work well in underground drainage systems because they can handle soil pressure better than threaded fittings.
Oil & Gas Pipelines
Long-distance pipelines operate under high pressure, and a weak joint is a serious risk. Buttweld fittings replace threaded interfaces with a continuous welded connection that holds firm under pressure fluctuations and outdoor exposure. In corrosive environments, that resistance is a practical necessity.
Chemical & Petrochemical Plants
Chemical plants carry acids, solvents, and caustic fluids that degrade ordinary steel quickly. Stainless steel and nickel alloy buttweld fittings resist that corrosion at the base material level. The welded joint also reduces leak points compared to flanged or threaded alternatives.
HVAC Systems
Heating and cooling systems expand and contract as temperatures change. Buttweld fittings handle this movement well and help prevent loosening or cracking over time.
Food & Beverage Processing
Food plants must have smooth internal surfaces on product contact lines to prevent bacteria from building up. Buttweld fittings have no internal threads or crevices, which makes cleaning-in-place procedures more effective. This is standard in dairy, beverage, and ready-to-eat production lines.
Pharmaceutical Industry
Pharmaceutical process lines require sterile conditions throughout. Buttweld fittings in 316L stainless steel with polished internal finishes are used in purified water, steam, and API transfer lines. The joint does not trap material the way threaded connections can, which matters in a cleanroom environment.
Power Plants
Boiler feed lines, steam systems, and condenser piping in power plants run at high temperatures and pressures without extended downtime. Buttweld fittings do not loosen under vibration or thermal cycling, which keeps maintenance requirements low between planned shutdowns.
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Types of Pipe Fittings and and Their Uses in Piping Systems
Pipe fittings join, redirect, or seal pipelines so systems run smoothly. ASME B16.11 pipe fittings cover a wide range of needs in industries where strong, leak-proof joints matter. Understanding pipe fittings types helps pick the right part for each job.
Elbow Fittings
Elbow fittings change the flow direction inside a piping system. The most common bends are 45° and 90°, though custom angles exist. They help pipes fit into limited spaces without straining the line. Elbows guide flow smoothly, reduce pressure loss and remain one of the most widely used pipe fittings types.
Tee Fittings
A single pipe can split into two due to tee fittings. They have three openings arranged at right angles. Tees are vital in water supply, gas distribution and chemical plants. Their design supports steady flow in both the main line and branch line without leaks.
Coupler Fitting
Couplers connect two pipes of the same size in a straight run. They are quick to install and restore flow during repairs. Couplers give a permanent, leak-tight joint when welded or threaded. As part of ASME B16.11 pipe fittings, they are reliable in both residential and industrial systems.
Union Fitting
Union fittings connect two pipes but allow easy removal when needed. Unlike couplers, unions unscrew without cutting the line. This makes them practical for equipment that requires frequent cleaning or replacement. They save downtime and simplify maintenance in small or hard-to-reach areas.
Cross Fittings
Cross fittings join four pipes that meet at right angles. They can split the flow into multiple lines or combine it from several sources. Crosses are often used in fire sprinkler systems, water supply networks, and chemical piping. Their design helps balance distribution while holding steady under pressure.
Reducer Fittings
Reducer fittings connect pipes with different diameters. Concentric reducers maintain the flow centred; eccentric reducers align the bottom to prevent air buildup. They ensure smooth transition without sudden pressure drops. Reducers are essential parts of ASME B16.11 pipe fittings, especially in pumps and process systems.
Cap Fittings
Cap fittings close the end of a pipe. They seal lines during testing, maintenance or shutdowns. Caps also protect open pipe ends from dirt, debris, and moisture. Though simple in design, they play a big role in keeping systems clean and safe.
Quick Selection Tips
Choosing the correct fitting ensures that a piping system is safe and reliable. Here are some crucial aspects to consider before making a choice.
- Material Match: Pick a fitting made from the same material as the pipe. This avoids weak joints and improves durability.
- Size Accuracy: Check that the fitting size matches the pipe size exactly. Even small gaps can cause leaks or flow loss.
- Pressure Rating: Confirm that the fitting can withstand the system’s pressure. This prevents bursts and keeps the wires secure.
- Temperature Resistance: Select fittings that can withstand system heat or cold. This protects against cracks and failures.
- End Connection Type: Match the end type such as threaded, socket weld, or butt weld, to your piping design which ensures proper fit.
- Corrosion Resistance: Use corrosion-resistant fittings in systems carrying water, chemicals, or gas which extends service life.
- Standards Compliance: Choose fittings that meet ASME B16.11 or other standards. This guarantees safety and reliable performance.
- Ease of Maintenance: Pick fittings that allow quick inspection, cleaning or replacement. This reduces downtime and saves costs.
Pipe Fittings Specifications
| Buttweld Pipe Fittings | Specifications |
| Size | ½”NB to 48″NB in |
| Standard | Sch 5, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160, STD, XS, XXS |
| Schedule | Sch 10s, 40s, 80s, 160s, XXS. |
| Specification | ASTM A182 / A403 & ASME SA182 / SA403 |
| Dimensions | ASME, ASTM , DIN, EN, JIS, AISI, BS, ANSI,. |
| Types | Elbow Pipe Fitting, Tee Pipe Fitting, Stub End Pipe Fitting, Reducer Pipe Fitting, Nipple Pipe Fitting, Bend Pipe Fitting, End Caps Pipe Fitting, Coupling Pipe Fitting |
Pipe Fittings Standards
Pipe fittings must meet particular standards to ensure safety, strength, and a proper fit. ASME B16.11 specifies material, size, pressure, and testing procedures. Following these standards helps to the long-term reliability of pipe systems in various sectors.
ASME B16.9
ASME B16.28
ASME B16.5
EN 10253
ISO 3419
JIS B2311
BS 1640
Pipe Fitting Materials
Stainless Steel Pipe Fittings
- Stainless Steel Pipe Fittings
- Stainless Steel 304 / 304L Pipe Fittings
- Stainless Steel 310 Pipe Fittings
- Stainless Steel 316 / 316L Pipe Fittings
- Stainless Steel 317 / 317L Pipe Fittings
- Stainless Steel 321 Pipe Fittings
- Stainless Steel 904L Pipe Fittings
- Stainless Steel 15-5 PH Pipe Fittings
- Stainless Steel 17-4 PH Pipe Fittings
Monel Pipe Fittings
Copper Nickel Pipe Fittings
Nickel Alloy Pipe Fittings
ASME B16.9 Dimension Chart
The ASME B16.9 dimension chart lists standard sizes, wall thickness, and measurements for buttweld fittings. It helps engineers and buyers select the right elbow, tee, reducer, or cap for a piping system.
| Nominal Pipe Size | Outside Diameter | Center to Face | N | Back to Face | Center to Center | Length ‘L’ MS SS P43 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inch | mm | A | B | C | E | F | G | R | M | S | L | L | ||
| 1/2 | 15 | 21.3 | 38.00 | 16.0 | 25.0 | 25.0 | 48.0 | 25.0 | 48.0 | 76.0 | – | 35.0 | 50.8 | 76.2 |
| 3/4 | 20 | 26.7 | 29.00 | 11.0 | 29.0 | 25.0 | 43.0 | – | 43.0 | 57.0 | – | 43.0 | 50.8 | 76.2 |
| 1 | 25 | 33.4 | 38.00 | 22.0 | 38.0 | 25.0 | 38.0 | 56.0 | 41.0 | 76.0 | 51.0 | 51.0 | 50.8 | 101.6 |
| 1 1/4 | 32 | 42.2 | 48.00 | 25.0 | 48.0 | 32.0 | 38.0 | 70.0 | 52.0 | 95.0 | 64.0 | 64.0 | 50.8 | 101.6 |
| 1 1/2 | 40 | 48.3 | 57.15 | 29.0 | 57.0 | 38.0 | 38.0 | 83.0 | 62.0 | 114.0 | 76.0 | 73.0 | 50.8 | 101.6 |
| 2 | 50 | 60.3 | 76.00 | 35.0 | 64.0 | 51.0 | 38.0 | 106.0 | 81.0 | 152.0 | 102.0 | 93.0 | 63.5 | 152.4 |
| 2 1/2 | 65 | 73 | 95.25 | 44.0 | 76.0 | 64.0 | 38.0 | 132.0 | 100.0 | 191.0 | 127.0 | 105.0 | 63.5 | 152.4 |
| 3 | 80 | 88.9 | 114.30 | 51.0 | 86.0 | 76.0 | 51.0 | 159.0 | 121.0 | 229.0 | 152.0 | 127.0 | 63.5 | 152.4 |
| 3 1/2 | 90 | 101.6 | 133.35 | 57.0 | 95.0 | 89.0 | 64.0 | 184.0 | 140.0 | 267.0 | 178.0 | 140.0 | 76.2 | 152.4 |
| 4 | 100 | 114.3 | 152.0 | 63.0 | 105.0 | 102.0 | 64.0 | 210.0 | 159.0 | 305.0 | 203.0 | 157.0 | 76.2 | 152.4 |
| 5 | 125 | 141.3 | 190.0 | 79.0 | 123.0 | 127.0 | 76.0 | 262.0 | 197.0 | 381.0 | 254.0 | 186.0 | 76.2 | 203.2 |
| 6 | 150 | 168.3 | 229.0 | 95.0 | 143.0 | 152.0 | 89.0 | 313.0 | 237.0 | 457.0 | 305.0 | 216.0 | 88.9 | 203.2 |
| 8 | 200 | 219.1 | 305.0 | 127.0 | 178.0 | 203.0 | 102.0 | 414.0 | 313.0 | 610.0 | 406.0 | 270.0 | 101.6 | 203.2 |
| 10 | 250 | 273.1 | 381.0 | 159.0 | 216.0 | 254.0 | 127.0 | 515.0 | 391.0 | 762.0 | 508.0 | 324.0 | 127 | 254 |
| 12 | 300 | 323.9 | 457.0 | 190.0 | 254.0 | 303.0 | 152.0 | 619.0 | 467.0 | 914.0 | 610.0 | 381.0 | 152.4 | 254 |
| 14 | 350 | 355.6 | 533.0 | 222.0 | 279.0 | 356.0 | 165.0 | 711.0 | 533.0 | 1067.0 | 711.0 | 413.0 | 152.4 | 305.0 |
| 16 | 400 | 406.4 | 610.0 | 254.0 | 305.0 | 406.0 | 178.0 | 813.0 | 610.0 | 1219.0 | 813.0 | 470.0 | 152.4 | 305.0 |
| 18 | 450 | 457.2 | 686.0 | 286.0 | 343.0 | 457.0 | 203.0 | 914.0 | 686.0 | 1372.0 | 914.0 | 533.0 | 152.4 | 305.0 |
| 20 | 500 | 508 | 762.0 | 318.0 | 381.0 | 508.0 | 229.0 | 1016.0 | 762.0 | 1524.0 | 1016.0 | 584.0 | 152.4 | 305.0 |
| 22 | 550 | 559 | 838.0 | 343.0 | 419.0 | 559.0 | 254.0 | 1118.0 | 838.0 | 1676.0 | 1118.0 | 614.4 | 152.4 | 305.0 |
| 24 | 600 | 610 | 914.0 | 381.0 | 432.0 | 610.0 | 267.0 | 1219.0 | 914.0 | 1829.0 | 1219.0 | 692.0 | 152.4 | 305.0 |
| 26 | 650 | 660 | 991.0 | 406.0 | 495.0 | 660.0 | 267.0 | – | – | – | – | – | – | – |
| 28 | 700 | 711 | 1067.0 | 438.0 | 521.0 | 711.0 | 267.0 | – | – | – | – | – | – | – |
| 30 | 750 | 762 | 1143.0 | 470.0 | 589.0 | 762.0 | 267.0 | – | – | – | – | – | – | – |
| 32 | 800 | 813 | 1219.0 | 502.0 | 597.0 | 813.0 | 267.0 | – | – | – | – | – | – | – |
| 34 | 850 | 864 | 1295.0 | 533.0 | 635.0 | 864.0 | 267.0 | – | – | – | – | – | – | – |
| 36 | 900 | 914 | 1372.0 | 565.0 | 673.0 | 914.0 | 267.0 | – | – | – | – | – | – | – |
| 38 | 950 | 965.0 | 1448 | 600 | 711 | 965 | 305 | – | – | – | – | – | – | – |
| 40 | 1000 | 1016.0 | 1524 | 632 | 749 | 1016 | 305 | – | – | – | – | – | – | – |
| 42 | 1050 | 1067.0 | 1600 | 660 | 762 | 1067 | 305 | – | – | – | – | – | – | – |
| 44 | 1100 | 1118.0 | 1676 | 695 | 813 | 1118 | 343 | – | – | – | – | – | – | – |
| 46 | 1150 | 1168.0 | 1753 | 727 | 851 | 1168 | 343 | – | – | – | – | – | – | – |
| 48 | 1200 | 1219.0 | 1829 | 759 | 889 | 1219 | 343 | – | – | – | – | – | – | – |
Why Choose Robust Special Metals for Buttweld Fittings?
Selecting the right partner for pipe fittings matters. We stand out among pipe fittings suppliers in Mumbai by offering quality, reliability, and value.
- Large Inventory with Ready Stock: We maintain a substantial stock of buttweld fittings in all standard sizes. This enables clients to receive speedy deliveries without waiting for production.
- Wide Material Selection: From stainless steel to alloy and duplex grades, we cover a broad range of materials. This ensures that you find fittings that meet both system requirements and industry standards.
- Competitive Prices for Bulk and Small orders: We provide reasonable pricing for both large and small purchases. Customers benefit from cost savings without compromising quality.
- International Quality Certifications: Our fittings meet ASME, ASTM and ISO specifications. Certified quality guarantees safe and dependable operation in key pipe systems.
- On-Time Delivery Worldwide: We ship orders on schedule to customers across the globe. Reliable logistics support makes sure your projects stay on track.
We Export Globally
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