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Schedule 80 Carbon Steel Pipe is made up of carbon steel materials. The carbon steels can vary in composition based on the grades. The strengths and the toughness vary. To have an international and equal identification of the pressure capacities of the pipes, the schedule scale is used. The wall thickness grades of the steel pipe range from Schedule (SCH) 5 to Schedule (SCH) 160. SCH 5 has the lowest pressure resistance, while SCH 160 has the highest.
A Schedule 80 carbon steel pipe is defined by its specific wall thickness. The SCH 80 pipe thickness in mm varies with the nominal pipe size (NPS), making it a critical parameter for engineers. For example, the 2 inch SCH 80 pipe thickness in mm is 5.54mm, while the 4 inch SCH 80 pipe thickness is 8.56mm.
Schedule 80 represents a thicker-than-standard wall thickness series, positioning it between standard (SCH 40) and extra-strong (SCH 160) schedules in terms of pressure capacity. The nominal bore sizes range from 1/8 inches through 24 inches and the internal and external diameters vary. The wall thickness and pressure rating depend on all of these factors; the wall thickness, the diameter and the material grade. The stronger materials don't need to have thicker walls to be in schedule 80. The Schedule 80 Pipe Weight differs based on the grade, wall thickness, diameter and length of the pipe. Please contact us for more information and pricings.
The following table provides the exact schedule 80 pipe thickness in mm, outside diameter, and weight per meter for each nominal size, answering common questions like "how thick is schedule 80 pipe?" for all standard dimensions.
All data in the table below is compiled according to the ASME/ANSI B36.10 standard and applies to carbon steel, alloy steel, and stainless steel pipes.
| Nominal size [inches] | Outside diameter [inches] | Outside diameter [mm] | Wall thickness [inches] | Wall thickness [mm] | Weight [lb/ft] | Weight [kg/m] |
|---|---|---|---|---|---|---|
| 1/8" DN6 | 0.405 | 10.3 | 0.095 | 2.41 | 0.31 | 0.47 |
| 1/4" DN8 | 0.54 | 13.7 | 0.119 | 3.02 | 0.54 | 0.8 |
|
3/8" DN10 |
0.68 | 17.1 | 0.126 | 3.2 | 0.74 | 1.1 |
| 1/2" DN15 | 0.84 | 21.3 | 0.147 | 3.73 | 1.09 | 1.62 |
| 3/4" DN20 | 1.05 | 26.7 | 0.154 | 3.91 | 1.47 | 2.2 |
| 1" DN25 | 1.315 | 33.4 | 0.179 | 4.55 | 2.17 | 3.24 |
| 1 1/4" DN32 | 1.66 | 42.2 | 0.191 | 4.85 | 3 | 4.47 |
| 1 1/2" DN40 | 1.9 | 48.3 | 0.2 | 5.08 | 3.63 | 5.41 |
| 2" DN50 | 2.375 | 60.3 | 0.218 | 5.54 | 5.02 | 7.48 |
| 2 1/2" DN65 | 2.875 | 73 | 0.276 | 7.01 | 7.66 | 11.41 |
| 3" DN80 | 3.5 | 88.9 | 0.3 | 7.62 | 10.25 | 15.27 |
| 3 1/2" DN90 | 4 | 101.6 | 0.318 | 8.08 | 12.5 | 18.63 |
| 4" DN100 | 4.5 | 114.3 | 0.337 | 8.56 | 14.98 | 22.32 |
| 5" DN125 | 5.563 | 141.3 | 0.375 | 9.53 | 20.78 | 30.97 |
| 6" DN150 | 6.625 | 168.3 | 0.432 | 10.97 | 28.57 | 42.56 |
| 8" DN200 | 8.625 | 219.1 | 0.5 | 12.7 | 43.39 | 64.64 |
| 10" DN250 | 10.75 | 273 | 0.594 | 15.09 | 64.43 | 96.01 |
| 12" DN300 | 12.75 | 323.8 | 0.688 | 17.48 | 88.63 | 132.08 |
| 14" DN350 | 14 | 355.6 | 0.75 | 19.05 | 106.13 | 158.1 |
| 16" DN400 | 16 | 406.4 | 0.844 | 21.44 | 136.61 | 203.53 |
| 18" DN450 | 18 | 457 | 0.938 | 23.83 | 170.92 | 254.55 |
| 20" DN500 | 20 | 508 | 1.031 | 26.19 | 208.87 | 311.17 |
| 24" DN600 | 24 | 610 | 1.125 | 30.96 | 296.58 | 442.08 |
Note: The above data applies to carbon steel, alloy steel, and stainless steel pipes. The outer diameter (OD) is fixed; as the Schedule number (wall thickness series) increases, the wall thickness increases, and the inner diameter (ID) decreases accordingly.
● 6 inch SCH 80 pipe thickness: 10.97 mm
● 8 inch SCH 80 pipe thickness: 12.70 mm
● 10 inch SCH 80 pipe thickness: 15.09 mm
Understanding SCH 80 is critical for engineers and procurement specialists. The primary reasons to select Schedule 80 pipe over lighter schedules like SCH 40 are:
1. Higher Pressure Ratings: The thicker wall allows SCH 80 pipe to safely handle significantly higher internal pressures.
2. Greater Mechanical Strength: It offers better resistance to impacts, vibrations, and external loads.
3. Threading Integrity: The increased wall thickness provides more material for stronger, deeper threads, reducing the risk of leakage in threaded connections.
4. Corrosion and Wear Allowance: The extra wall thickness provides a larger margin for corrosion or abrasion over the pipe's service life.
However, these benefits come with trade-offs: SCH 80 pipe is heavier, more expensive, and has a smaller internal diameter (reducing flow capacity) compared to SCH 40 for the same outer diameter.
△ Need to compare SCH 80 with SCH 40 for your specific project?
Please refer to our detailed selection guide: Schedule 40 vs. Schedule 80: A Selection Guide.
1. How thick is schedule 80 pipe?
The exact thickness of Schedule 80 pipe depends on its nominal size (NPS). Below are the wall thickness and corresponding outside diameter (OD) for the most commonly requested sizes:
● 2 inch schedule 80 pipe: 5.54 mm wall thickness (OD: 60.3 mm)
● 3 inch schedule 80 pipe: 7.62 mm wall thickness (OD: 88.9 mm)
● 4 inch schedule 80 pipe: 8.56 mm wall thickness (OD: 114.3 mm)
● 6 inch schedule 80 pipe: 10.97 mm wall thickness (OD: 168.3 mm)
● 8 inch schedule 80 pipe: 12.70 mm wall thickness (OD: 219.1 mm)
● 10 inch schedule 80 pipe: 15.09 mm wall thickness (OD: 273.0 mm)
For all other sizes, please refer to the complete dimension chart above. Remember, for the same NPS, the outside diameter (OD) remains constant regardless of the schedule; only the wall thickness and inner diameter (ID) change.
2. How much does schedule 80 pipe weigh?
The weight of Schedule 80 pipe depends on its size, material, and length. You can calculate it using the following formula:3. What is schedule 80 pipe rated for pressure?
The pressure rating of Schedule 80 pipe is not a fixed value. It depends on three factors: pipe size, material grade, and operating temperature.
The key difference is wall thickness. SCH 80 is typically 30% to 100% thicker than SCH 40 for the same pipe size, making it significantly stronger, heavier, and able to withstand higher pressures. For example, a 2-inch SCH 80 pipe has a 5.54mm wall, while SCH 40 has a 3.91mm wall.
For a full comparison table covering all sizes, weight, cost, and application guidelines, please see our dedicated guide: [Schedule 40 vs. Schedule 80: A Selection Guide].
6. Can Schedule 80 pipe be threaded?
Yes. In fact, because SCH 80 has a thicker wall than SCH 40, it provides more material for threading, resulting in deeper, stronger threads. This makes it a preferred choice for high-pressure threaded connections where joint integrity is critical.
Hunan Standard Steel Co., Ltd (HSCO), as a leading direct manufacturer, offers not only highly competitive mill prices but also professional, tailored technical support.
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