Steel Pipe Dimensions Reference
Quick Pipe Size Lookup
Browse standard steel pipe sizes by nominal pipe size (NPS), or open a specific schedule reference.
| NPS | DN | Outside Diameter | Reference |
|---|---|---|---|
| NPS 2 | DN 50 | 2.375 in / 60.33 mm | View NPS 2 |
| NPS 3 | DN 80 | 3.5 in / 88.90 mm | View NPS 3 |
| NPS 4 | DN 100 | 4.5 in / 114.30 mm | View NPS 4 |
| NPS 6 | DN 150 | 6.625 in / 168.28 mm | View NPS 6 |
| NPS 8 | DN 200 | 8.625 in / 219.07 mm | View NPS 8 |
| NPS 10 | DN 250 | 10.75 in / 273.05 mm | View NPS 10 |
| NPS 12 | DN 300 | 12.75 in / 323.85 mm | View NPS 12 |
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About PipeLookup
PipeLookup provides a quick reference for standard steel pipe dimensions, including NPS, DN, outside diameter, wall thickness, inside diameter, and weight.
The V1 reference data is based on ASME B36.10-2022. Metric values such as millimeter dimensions and inside diameter are presented as calculated or converted reference values.
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FAQ
What is NPS?
NPS stands for Nominal Pipe Size. It is a standard designation used to identify pipe size.
Does NPS equal the actual outside diameter?
No. NPS is a nominal designation. The standard outside diameter depends on the NPS size and is not necessarily equal to the NPS number.
What standard does PipeLookup reference?
PipeLookup V1 references ASME B36.10-2022 for welded and seamless wrought steel pipe dimensions.