This reference brings together the key identification and dimensional information for 3/8 inch Schedule 40 pipe, also identified as NPS 3/8 and DN10. Use it when checking a piping drawing, preparing a material takeoff, coordinating supports, or selecting a matching fitting and flange reference.
For design and drafting accuracy, distinguish the nominal size from the measured pipe geometry. The nominal designation identifies the standardized pipe size, while the listed outside diameter, inside diameter, and wall thickness are the dimensions needed for layout and coordination. The accompanying DWG resource can support CAD workflows, but project units, layer conventions, connection details, and fabrication requirements should still be checked before use.
Schedule 40 pipe 3/8 inch (DN10) is a standard steel pipe size commonly used in piping design, fabrication, drafting, and engineering estimation work. This page provides the standard dimensions and weight data for NPS 3/8 Schedule 40 pipe based on ANSI / ASME B36.10, including outside diameter, inside diameter, wall thickness, and weight per meter.
This size is widely used in industrial piping systems, utility services, small-bore water lines, instrumentation connections, and fabrication projects where accurate dimensional data is important for layout, support selection, material takeoff, and installation planning.
3/8 Inch Schedule 40 Pipe Dimensions
- Nominal Pipe Size (NPS): 3/8 inch
- Diameter Nominal (DN): DN10
- Pipe Schedule: Schedule 40
- Outside Diameter (OD): 17.1 mm
- Wall Thickness: 2.31 mm
- Inside Diameter (ID): 12.48 mm
- Pipe Weight: 0.84 kg/m
- Pipe Weight Including Water: 0.96 kg/m
- Reference Standard: ANSI / ASME B36.10
Schedule 40 Pipe 3/8 Inch (DN10) Data Table
| NPS | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 3/8 inch | DN10 | 17.1 | 2.31 | 12.48 | 0.84 |
What Is 3/8 Inch Schedule 40 Pipe Used For?
3/8 inch Schedule 40 pipe is commonly used in small-bore industrial and utility piping systems where a standardized steel pipe size is required. Engineers, designers, and fabricators often use this size in instrumentation connections, utility piping, compressed air lines, small process piping systems, mechanical piping layouts, and light fabrication work.
Because this is a compact and practical pipe size, accurate dimensions and weight data are important for installation work, support selection, material estimation, and field coordination.
Why These Dimensions Matter in Engineering
In piping and mechanical design, standard pipe dimensions are important for more than simple identification. The outside diameter is used for supports, clamps, insulation sizing, and equipment connection layouts. The inside diameter affects internal flow area and hydraulic calculations. The wall thickness is important for fabrication, welding preparation, and pipe strength, while the pipe weight per meter is useful for support load calculations and installation planning.
Using the correct DN10 Schedule 40 pipe dimensions helps reduce drafting errors, procurement mistakes, and field fit-up problems during construction and fabrication work.
3/8 Inch DN10 Schedule 40 Pipe for CAD and Drafting Work
For CAD, BIM, and piping drafting work, this size is commonly listed as NPS 3/8 or DN10. The standard OD of 17.1 mm is especially useful for routing clearance, support detailing, and nozzle or equipment connection references in both 2D drawings and 3D models.
This page can be used as a quick reference for 3/8 inch Schedule 40 pipe dimensions, DN10 pipe dimensions, and Schedule 40 steel pipe weight per meter during design, drafting, and estimation work.
Frequently Asked Questions
What is the outside diameter of 3/8 inch Schedule 40 pipe?
The outside diameter of 3/8 inch Schedule 40 pipe is 17.1 mm.
What is the wall thickness of DN10 Schedule 40 pipe?
The wall thickness is 2.31 mm.
What is the inside diameter of Schedule 40 pipe 3/8 inch?
The inside diameter is 12.48 mm.
How much does 3/8 inch Schedule 40 pipe weigh?
The pipe weight is 0.84 kg/m. The weight including water is 0.96 kg/m.
Which standard covers these dimensions?
These dimensions are based on ANSI / ASME B36.10.
Conclusion
Schedule 40 pipe 3/8 inch (DN10) is an important reference size for industrial piping, drafting, fabrication, and engineering calculations. With an OD of 17.1 mm, ID of 12.48 mm, wall thickness of 2.31 mm, and weight of 0.84 kg/m, it is a useful standard pipe size for engineers, designers, and estimators working with steel piping systems.
For more pipe schedule data, compare this size with nearby standard sizes such as 1/4 inch and 1/2 inch Schedule 40 pipe pages.
How to Read This Pipe Reference
The dimensional table is most useful when each value is applied to the correct task. Use the outside diameter when coordinating clamps, supports, insulation space, sleeves, and adjacent equipment. Use the inside diameter when reviewing the available flow passage or checking hydraulic inputs. The wall thickness helps identify the pipe construction shown on the drawing and supports fabrication and welding review.
The listed pipe weight is useful for estimating, handling, and support-load coordination. The water-inclusive figure should be treated as the reference condition stated by this page; project calculations may also need to consider fittings, valves, insulation, contents, corrosion allowance, and other attached items.
Drafting and Procurement Checks
- Record both NPS 3/8 and DN10 when a drawing or purchase description may be reviewed by teams using different designation systems.
- Confirm that the selected fittings, valves, couplings, and flanges match the intended pipe size and connection standard.
- Use the outside diameter for spatial coordination rather than treating the nominal size as a measured envelope.
- Check the project material specification, joining method, corrosion requirements, and applicable design rules before procurement or fabrication.
- Use the downloadable DWG as a drafting aid and verify its units and project conventions before incorporating it into a model.
Related Pipe and Piping References
Readers comparing nearby sizes can continue to the site’s 1/4 inch Schedule 40 pipe and 1/2 inch Schedule 40 pipe references. Related pages for pipe schedules, fittings, flanges, and piping terminology can also help connect dimensional data with procurement and drawing decisions.
Practical Questions About Using This Reference
Is the nominal size the same as the measured outside diameter?
No. The nominal designation is a standardized identifier. Layout and clearance work should use the listed outside diameter rather than assuming the nominal size is the physical measurement.
Can the listed weight be used as a complete support-load calculation?
It can provide a pipe-weight input for preliminary coordination, but a complete support review may also need the pipe contents, fittings, valves, insulation, attached equipment, operating condition, and project-specific load requirements.
Can this page replace the project piping specification?
No. This page is a dimensional and drafting reference. Material grade, joining requirements, pressure design, corrosion allowance, inspection requirements, and procurement details must come from the applicable project documents and engineering review.
What should be checked before using the DWG file?
Confirm the drawing units, scale, layer structure, coordinate conventions, and connection details before adding the file to a production model or fabrication drawing.