Welded Fittings
Welded fittings are used to connect pipes and components through welding, ensuring a leak-proof and strong connection. Due to their durable and robust nature, they are widely used across various industries. Some of the major applications include:
Table of contents
- Welded Steel Fittings Specification
- Dimensions of Welded Fittings
- Welded Pipe Fittings Applications
- Seamless and Welded Fittings Standards
- HS Code for Welded Pipe Fittings
- Welded Carbon Steel Fittings Benefits
- ASME B16.9 Buttweld Elbow Dimension
- What is welded fittings?
- Difference Between Seamless and Welded Fittings
- Welded Tee Dimension
- Welded Pipe Reducer Dimensions
Welded Steel Fittings Specification
Seamless Fitting Size |
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Welded fittings Size Range |
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ASTM Standards |
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Butt Weld Fittings Connection |
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Welded Black Iron Fittings Bending Radius |
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Welded Pipe Fittings Wall Thickness |
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Welded Carbon Steel Fittings Density |
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Welded Steel Pipe Fittings Temperature |
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ASTM A403 Welded Fittings Testing Methods |
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View ASTM A403 welded fittings sizes, dimensions and application
ASTM A403 welded fittings are forged and rolled austenitic stainless steel fittings primarily used for pressure piping systems. They are commonly found in engineering and energy transformation industries.
The ASTM A403 standard includes various grades of austenitic stainless steel. The following table provides the available dimensions of welded fittings.
Dimensions of Welded Fittings
NPS In. |
OD | Wall Thickness T | 90° Elbows | 90° Returns | 45° Elbows |
Crosses | Caps | Tees | Stub Ends | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
XS | ST | XX | 160 | Short R A |
Long R A |
Short R K |
Long R K |
B | C | E | C | G | F | ||
1 | 1.315 | 0.179 | 0.133 | 0.358 | 0.250 | 1 | 1-1/2 | 1-5/8 | 2-3/16 | 7/8 | – | 1-1/2 | 1-1/2 | 2 | 4 |
3/4 | 1.050 | 0.154 | 0.113 | 0.308 | – | – | 1-1/8 | – | 1-11/16 | 7/16 | – | 1-1/4 | 1-1/8 | 1-11/16 | 3 |
1-1/2 | 1.900 | 0.200 | 0.145 | 0.400 | 0.281 | 1-1/2 | 2-1/4 | 2-7/16 | 3-1/4 | 1-1/8 | 2-1/4 | 1-1/2 | 2-1/4 | 2-7/8 | 4 |
1/2 | 0.840 | 0.147 | 0.109 | – | – | – | 1-1/2 | – | 1-15/16 | 5/8 | – | 1 | 1 | 1-3/8 | 3 |
1-1/4 | 1.660 | 0.191 | 0.140 | 0.382 | 0.250 | 1-1/4 | 1-7/8 | 2-11/16 | 2-3/4 | 1 | 1-7/8 | 1-1/2 | 1-7/8 | 2-1/2 | 4 |
2 | 2.375 | 0.218 | 0.154 | 0.436 | 0.344 | 2 | 3 | 3-3/16 | 4-3/16 | 1-3/8 | 2-1/2 | 1-1/2* | 2-1/2 | 3-5/8 | 6 |
3 | 3.500 | 0.300 | 0.216 | 0.600 | 0.438 | 3 | 4-1/2 | 4-3/4 | 6-1/4 | 2 | 3-3/8 | 2* | 3-3/8 | 5 | 6 |
2-1/2 | 2.875 | 0.276 | 0.203 | 0.552 | 0.375 | 2-1/2 | 3-3/4 | 3-15/16 | 5-3/16 | 1-3/4 | 3 | 1-1/2 | 3 | 4-1/8 | 6 |
3-1/2 | 4.000 | 0.318 | 0.226 | 0.636 | – | 3-1/2 | 5-1/4 | 5-1/2 | 7-1/4 | 2-1/4 | 3-3/4 | 2-1/2* | 3-3/4 | 5-1/2 | 6 |
5 | 5.563 | 0.375 | 0.258 | 0.750 | 0.625 | 5 | 7-1/2 | 7-3/4 | 10-5/16 | 3-1/8 | 4-7/8 | 3* | 4-7/8 | 7-5/16 | 8 |
4 | 4.500 | 0.337 | 0.237 | 0.674 | 0.531 | 4 | 6 | 6-1/4 | 8-1/4 | 2-1/2 | 4-1/8 | 2-1/2* | 4-1/8 | 6-3/16 | 6 |
6 | 6.625 | 0.432 | 0.280 | 0.864 | 0.719 | 6 | 9 | 9-5/16 | 12-5/16 | 3-3/4 | 5-5/8 | 3-1/2* | 5-5/8 | 8-1/2 | 8 |
10 | 10.750 | 0.500 | 0.365 | 1.000 | 1.125 | 10 | 15 | 15-3/8 | 20-3/8 | 6-1/4 | 8-1/2 | 5* | 8-1/2 | 12-3/4 | 10 |
8 | 8.625 | 0.500 | 0.322 | 0.875 | 0.906 | 8 | 12 | 12-5/16 | 16-5/16 | 5 | 7 | 4* | 7 | 10-5/8 | 8 |
12 | 12.750 | 0.500 | 0.375 | 1.000 | 1.312 | 12 | 18 | 18-3/8 | 24-3/8 | 7-1/2 | 10 | 6* | 10 | 15 | 10 |
16 | 16.000 | 0.500 | 0.375 | – | – | 16 | 24 | 24 | 32 | 10 | 12 | 7* | 12 | 18-1/2 | 12 |
14 | 14.000 | 0.500 | 0.375 | – | – | 14 | 21 | 21 | 28 | 8-3/4 | 11 | 6-1/2* | 11 | 16-1/4 | 12 |
18 | 18.000 | 0.500 | 0.375 | – | – | 18 | 27 | 27 | 36 | 11-1/4 | 13-1/2 | 8* | 13-1/2 | 21 | 12 |
22 | 22.000 | 0.500 | 0.375 | – | – | – | 33 | – | 44 | 13-1/2 | 16-1/2 | 10 | 16-1/2 | – | – |
20 | 20.000 | 0.500 | 0.375 | – | – | 20 | 30 | 30 | 40 | 12-1/2 | 15 | 9* | 15 | 23 | 12 |
24 | 24.000 | 0.500 | 0.375 | – | – | 24 | 36 | 36 | 48 | 15 | 17 | 10-1/2 | 17 | 27-1/4 | 12 |
30 | 30.000 | 0.500 | 0.375 | – | – | 30 | 45 | 45 | 60 | 18-1/2 | 22 | 10-1/2 | 22 | – | – |
26 | 26.000 | 0.500 | 0.375 | – | – | – | 39 | – | 52 | 16 | 19-1/2 | 10-1/2 | 19-1/2 | – | – |
34 | 34.000 | 0.500 | 0.375 | – | – | – | 51 | – | – | 21 | 25 | 10-1/2 | 25 | – | – |
42 | 42.000 | 0.500 | 0.375 | – | – | 42 | 63 | – | – | 26 | – | 12 | – | – | – |
36 | 36.000 | 0.500 | 0.375 | – | – | 36 | 54 | 54 | – | 22-1/4 | – | 10-1/2 | 26-1/2 | – | – |
Welded Pipe Fittings Applications
- Petrochemical
- Chemical processing
- Water treatment
- Power generation
- Oil and gas
Refer various welded fittings standards such as ASME B16.9 and MSS SP-43
Welded fittings manufactured under the ASME B16.9 standard cover scope, size, material, pressure rating, etc. On the other hand, those made under the MSS SP-43 standard are used for low-pressure and corrosion-resistant applications.
The following table shows the ASTM standards for seamless and welded fittings, providing more details about each standard and its typical use.
Seamless and Welded Fittings Standards
ASTM Standards | A403 | A815 | A234 | A420 | A361 | A366 | A363 |
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Material Specification |
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Welded steel pipe fittings are available in beveled and plain ends
Welded pipe fittings with beveled ends are often manually or automatically processed by manufacturers to ensure stability. This allows a perfect combination with butt-weld fittings for an easier welding process.
Welded steel fittings with plain ends are typically used for strong, leak-proof joints. Their ends are smooth and do not have any threaded parts.
HS Code for Welded Pipe Fittings
Product | HS Code |
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Welded fittings | 73072300 |
Welded Carbon Steel Fittings Benefits
- Allow thin thickness (SCH 10 or SCH 10S)
- Various sizes (1/4″ to 24″)
- Many possibilities for twisting and ease of welding
- Butt weld saves more cost than socket weld or threaded
ASME B16.9 Buttweld Elbow Dimension
NPS | 1 | 01 1/4 | 01 1/2 | 2 | 02 1/2 | 3 | 03 1/2 | 4 | 5 | 6 |
---|---|---|---|---|---|---|---|---|---|---|
O.D mm | 33.4 | 42.2 | 48.3 | 60.3 | 73 | 88.9 | 101.6 | 114.3 | 141.3 | 168.3 |
inch | 1.32 | 1.66 | 1.9 | 2.38 | 2.88 | 3.5 | 4 | 4.5 | 5.56 | 6.62 |
A mm | 25 | 32 | 38 | 51 | 64 | 76 | 89 | 102 | 127 | 152 |
inch | 1 | 1.25 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 5 | 6 |
NPS | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | |
O.D mm | 219.1 | 273 | 323.8 | 355.6 | 406.4 | 457 | 508 | 559 | 610 | |
inch | 8.62 | 10.75 | 12.75 | 14 | 16 | 18 | 20 | 22 | 24 | |
A mm | 203 | 254 | 305 | 356 | 406 | 457 | 508 | 559 | 610 | |
inch | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 |
Welded Buttweld Pipe Fittings can be manufactured in various types and wall thickness
They can be manufactured in several types and wall thicknesses to suit a wide range of applications and environments. Different piping systems operate under varying temperature and pressure conditions, requiring pipe fittings that offer appropriate strength and longevity.
Therefore, manufacturers provide pipe fittings according to the required wall thickness—whether thicker or thinner—ensuring they can withstand certain pressures without damage.
What is welded fittings?
- Components used to connect, direct, or change the direction of pipes
- Provides strong, durable, and leak-proof connections
- suitable for high pressures and harsh environments
- Types: elbows, tees, reducers, stub end, and caps

Welded black iron fittings connect pipes using a weld for a robust connection
Welded black iron fittings connected to pipes create a permanent, leak-proof connection. This type of connection offers resistance against high pressure and temperature applications.
The robust connection involves using heat to melt the welded black iron fitting and joint to the elements, resulting in a permanent attachment. This process ensures high strength, leak resistance, and safety for the pipe fitting.
Difference Between Seamless and Welded Fittings
Features | Seamless Fittings | Welded Fittings |
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Manufacturing | Made from single piece of metal without joints or seams | Made by welding together separate pieces of metal |
Strength | Stronger due to the absence of seams | Slightly reduced strength at the weld joint |
Durability | Durable and less prone to failure | Susceptible to weld defects |
Cost | More expensive | Less expensive |
Pressure ratings | Higher | Lower |
Flexibility | Less | Designed with more variations in shape and size |
Surface finish | Smooth surface finish | May vary depending on the welding process |
Heat Treatment | Requires less heat treatment post-production | Requires heat treatment post-welding to relieve stresses |
Weight | Consistent weight due to uniform wall thickness | Depend on the thickness of welds and additional components. |
Application | Oil and gas, aerospace, and chemical processing | Lower-pressure systems like water and HVAC |
Welded Tee Dimension
NPS | Â | 1/2 | 3/4 | 1 | 1 1/4 | 1 1/2 | 2 | 2 1/2 | 3 | 3 1/2 | 4 | 5 | 6 | 8 |
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O.D | mm | 21.3 | 26.7 | 33.4 | 42.2 | 48.3 | 60.3 | 73 | 88.9 | 101.6 | 114.3 | 141.3 | 168.3 | 219.1 |
inch | 0.84 | 1.05 | 1.32 | 1.66 | 1.9 | 2.38 | 2.88 | 3.5 | 4 | 4.5 | 5.56 | 6.62 | 8.62 | |
C | mm | 25 | 29 | 38 | 48 | 57 | 64 | 76 | 86 | 95 | 105 | 124 | 143 | 178 |
inch | 1 | 1.12 | 1.5 | 1.88 | 2.2 Professional Childproof Cap manufacturer is located in China, including Plastic Screw Top Bottles,Child Resistant Cap,Child Proof Cap, etc. Childproof cap with PP plastic material, closure size with smooth and ribbed 18/410 ,20/410 ,24/410 ,28/410, 38/400 and more. The caps designed with alock, avoiding child to open Used in Cosmetic Bottle,medicine pill bottle , ..etc
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