Use this page as a practical reference when checking 5 inch Schedule 40S pipe dimensions for stainless steel piping layouts, fabrication documents, procurement, and CAD work. The reference identifies the equivalent DN designation, outside and inside diameters, wall thickness, pipe weight, and water-filled weight in one place.
For related design work, pair this dimensional reference with the applicable pipe fittings, flange dimensions, pipe support, and piping terminology resources. The downloadable DWG can also help drafters coordinate the pipe section with surrounding components, but project drawings should still be checked against the governing specification and approved design documents.
Schedule 40S Pipe 5 Inch (DN125) is a stainless steel pipe size commonly used in industrial piping systems that require corrosion resistance, dependable wall thickness, and reliable flow capacity. This pipe size is often used in process plants, utility systems, water treatment projects, and stainless steel fabrication work.
This dimension data is based on ANSI/ASME B36.19, which is the standard commonly used for stainless steel pipe dimensions.
5 Inch Schedule 40S Pipe Dimensions
- Pipe Schedule: 40S
- Nominal Pipe Size: 5 Inch
- DN Size: DN125
- Outside Diameter (OD): 141.3 mm
- Inside Diameter (ID): 128.2 mm
- Wall Thickness: 6.55 mm
- Pipe Weight: 21.77 kg/m
- Pipe Weight Including Water: 34.67 kg/m
- Standard: ANSI/ASME B36.19
Schedule 40S Pipe 5 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 40S | 5 | 125 | 141.3 | 128.2 | 6.55 | 21.77 |
What Is 5 Inch Schedule 40S Pipe?
A 5 inch Schedule 40S pipe is a stainless steel pipe with a nominal size of 5 inches and a wall thickness defined by the 40S schedule. For this size, the outside diameter is fixed at 141.3 mm, while the inside diameter is 128.2 mm based on a wall thickness of 6.55 mm.
The letter S in 40S is commonly used for stainless steel pipe dimensions under ASME B36.19. This designation is widely used by engineers, fabricators, and procurement teams when selecting stainless steel piping for industrial service.
Where Is Schedule 40S Pipe 5 Inch Used?
This pipe size is commonly used in systems that need both good flow capacity and the corrosion resistance of stainless steel. Typical applications include:
- Process piping in industrial plants
- Water treatment and utility systems
- Food and beverage piping lines
- Chemical service piping
- Stainless steel header systems
Why Pipe Dimensions Matter
Accurate 5 inch Schedule 40S pipe dimensions are important for piping layout, fabrication, support design, transport planning, and material takeoff. Engineers and designers often check OD, ID, wall thickness, and weight before selecting flanges, fittings, supports, and installation methods.
The outside diameter is important for matching clamps, flanges, and pipe supports. The inside diameter helps estimate flow area and system capacity. The wall thickness is important for specification compliance and mechanical strength, while the pipe weight per meter is useful for structural loading, support design, and handling calculations.
5 Inch Schedule 40S Pipe Weight Information
The nominal weight of this pipe size is 21.77 kg/m. When filled with water, the combined weight becomes approximately 34.67 kg/m. This information is useful for lifting plans, support design, and pipe rack load calculations in industrial projects.
Difference Between NPS 5 and DN125
NPS 5 is the inch-based nominal pipe size, while DN125 is the metric designation used in international drawings and specifications. Both terms refer to the same nominal pipe size, and users may search by either inch or DN format depending on project standards.
Common Search Terms for This Pipe Size
Users may also search for this pipe using related keywords such as 5 inch Schedule 40S pipe dimensions, DN125 Schedule 40S pipe dimensions, 5 inch stainless steel pipe weight, DN125 pipe dimensions, or DN125 sch 40s pipe dimensions.
Conclusion
Schedule 40S Pipe 5 Inch (DN125) has an outside diameter of 141.3 mm, an inside diameter of 128.2 mm, a wall thickness of 6.55 mm, and a weight of 21.77 kg/m. It is a useful stainless steel pipe reference size for design, drafting, fabrication, and procurement work.
This page provides a quick reference for engineers, drafters, fabricators, and buyers who need reliable 5 inch Schedule 40S pipe dimensions and DN125 pipe dimensions in one place.
How to Use This 5 Inch Schedule 40S Reference
Start with the nominal designation used by the project: NPS 5, 5 inch, and DN125 identify the same nominal pipe size in the source data. For physical coordination, use the listed outside diameter when checking clearances, supports, clamps, and connections. Use the inside diameter when reviewing the available flow passage or comparing the pipe with connected equipment.
The wall thickness and pipe weight are useful for material takeoffs, handling reviews, support calculations, and pipe-rack coordination. The water-filled weight is a separate reference for cases where the line contents contribute to the supported load. It should not be treated as a complete operating load unless the project also accounts for insulation, valves, fittings, contents, testing conditions, and other applicable loads.
Checks Before Using the Data in a Project
- Confirm that the project specification calls for stainless steel pipe dimensions associated with the stated schedule.
- Check material grade, manufacturing requirements, corrosion conditions, joining method, and design service separately from dimensional selection.
- Use the outside diameter when coordinating fittings, flanges, supports, and clearance zones; do not infer connection details from nominal size alone.
- Review the source table and the project documents together before issuing fabrication, procurement, or construction information.
- Use the downloadable DWG as a drafting aid and verify its geometry against the approved dimensional reference before incorporating it into a controlled drawing.
Related Pipe Reference Topics
Readers comparing this size with adjacent stainless steel options may also benefit from references covering pipe schedules, NPS versus DN designations, stainless steel pipe fittings, flange selection, and pipe support design considerations. These topics help connect dimensional data with the practical decisions made during layout, detailing, and procurement.
Frequently Asked Questions
What does 5 inch Schedule 40S mean?
It identifies a stainless steel pipe by its nominal pipe size and schedule designation. In this reference, the corresponding metric designation is DN125.
Are NPS 5 and DN125 the same nominal pipe size?
Yes. NPS 5 is the inch-based designation, while DN125 is the metric designation used for the same nominal pipe size in the source data.
Which dimension should be used for pipe support coordination?
The outside diameter is the primary dimensional reference for coordinating supports, clamps, and clearance requirements. Support design must also account for the applicable pipe, contents, fittings, insulation, and project loads.
What is the difference between pipe weight and water-filled weight?
Pipe weight refers to the pipe itself. Water-filled weight combines the listed pipe weight with the weight of water inside the pipe, as shown in the reference data.
Can the DWG file be used directly for fabrication?
The DWG is a useful drafting reference, but it should be checked against the approved project specification, dimensional data, connection details, and fabrication requirements before use.