This reference page summarizes the dimensional data for 1 1/4 inch Schedule 5S stainless steel pipe, also identified as NPS 1 1/4 and DN32. Use it to check the nominal size, outside and inside diameters, wall thickness, pipe weight, and the related DWG resource before preparing layouts, material takeoffs, or fabrication documentation.
When comparing this size with other stainless steel pipe schedules, keep the nominal designation separate from the actual measured dimensions. The OD is especially important when checking pipe fittings, clamps, supports, sleeves, and connected equipment. The ID and wall thickness are more relevant to flow-path review and section comparison.
Schedule 5S Pipe 1 1/4 Inch (DN32 mm) is a stainless steel pipe size commonly used in industrial piping systems where corrosion resistance and lighter wall thickness are required. This pipe size is typically referenced under ANSI/ASME B36.19, which is the standard used for stainless steel pipe dimensions.
For this size, the pipe has an outside diameter (OD) of 42.2 mm, an inside diameter (ID) of 38.9 mm, and a wall thickness of 1.65 mm. The listed pipe weight is 1.65 kg/m, while the weight including water is 2.83 kg/m.
Schedule 5S Pipe 1 1/4 Inch (DN32 mm) Dimension Table
| Pipe Size | NPS | DN | Outside Diameter (OD) | Inside Diameter (ID) | Wall Thickness | Weight |
|---|---|---|---|---|---|---|
| Schedule 5S Pipe | 1 1/4 Inch | DN32 | 42.2 mm | 38.9 mm | 1.65 mm | 1.65 kg/m |
What Is Schedule 5S Pipe?
Schedule 5S is a thin-wall stainless steel pipe schedule listed in ASME B36.19. The āSā designation is commonly used for stainless steel pipe schedules. Compared with heavier schedules, Schedule 5S provides a lighter wall thickness and lower pipe weight, which can help reduce handling effort, support load, and fabrication requirements in suitable applications.
However, pipe schedule selection should always be reviewed against design pressure, temperature, corrosion allowance, project code, and service conditions before final use.
1 1/4 Inch Schedule 5S Pipe Data
- Standard: ANSI/ASME B36.19
- Pipe Type: Stainless Steel Pipe
- NPS: 1 1/4 Inch
- DN: DN32
- OD: 42.2 mm
- ID: 38.9 mm
- Wall Thickness: 1.65 mm
- Pipe Weight: 1.65 kg/m
- Weight Including Water: 2.83 kg/m
Common Uses of 1 1/4 Inch Schedule 5S Pipe
1 1/4 inch Schedule 5S stainless steel pipe may be used in applications where corrosion resistance, lighter wall thickness, and good flow capacity are needed. Typical uses may include:
- Water treatment and utility piping systems
- Industrial stainless steel process lines
- Low-pressure transfer piping
- Food and beverage production systems
- Chemical and general fabrication projects
Why DN32 Pipe Dimensions Matter
Many users search for DN32 pipe dimensions to verify piping layout, support spacing, fabrication requirements, transport limits, and compatibility with fittings or connected equipment. For this pipe size, accurate dimensions are important for spool coordination, structural checks, and installation planning.
Knowing the correct 1 1/4 inch Schedule 5S pipe dimensions also helps engineers, designers, estimators, buyers, and students compare this size with other schedules when reviewing wall thickness, internal flow area, and total pipe weight.
NPS 1 1/4 and DN32 Explained
NPS stands for Nominal Pipe Size in inches, while DN stands for Diameter Nominal in metric designation. For this pipe size:
- NPS 1 1/4 = inch-based nominal pipe size
- DN32 = metric nominal designation
Although DN is shown in metric form, the actual outside diameter should always be checked from the dimensional standard. For this size, the OD is 42.2 mm.
Reference for Schedule 5S Pipe 1 1/4 Inch
This page provides a quick dimensional reference for engineers, piping designers, students, fabricators, and procurement teams looking for Schedule 5S Pipe 1 1/4 Inch (DN32 mm) data in a clear format.
Reference Standard: ANSI/ASME B36.19 stainless steel pipe dimensions.
How to Read the DN32 Schedule 5S Pipe Data
The dimension table gives the primary geometry for this pipe size. Outside diameter describes the external envelope used for fit-up and connection coordination. Inside diameter describes the nominal flow passage. Wall thickness is the material thickness between those two surfaces, while the listed pipe weight supports handling, support, and material-estimating checks.
The separate weight including water value should not be confused with the dry pipe weight. It represents the listed pipe condition with water present and can be useful when considering operating load, temporary filling, or support review. Final support and structural checks still depend on the complete piping arrangement, contents, insulation, valves, fittings, and applicable project requirements.
Practical Checks Before Using This Reference
- Confirm that the project calls for stainless steel pipe dimensions rather than a different pipe product or tubing designation.
- Use the OD when coordinating fittings, flanges, supports, penetrations, and CAD geometry.
- Use the ID and wall thickness when reviewing flow passage, fabrication details, and schedule comparisons.
- Check the applicable design code, service conditions, temperature, pressure, corrosion allowance, joining method, and material specification before approval.
- Compare the table with the purchasing specification and supplier documentation when ordering material.
Related PipeSTD Reference Topics
This page can be used alongside related pipe schedule charts, stainless steel pipe dimension references, pipe fittings and flange resources, and CAD/DWG pipe references. Those resources help connect dimensional selection with drafting, fit-up, procurement, and installation review without treating nominal size alone as a complete design specification.
The downloadable DWG is useful for preliminary drafting and coordination. Before issuing fabrication or construction documents, verify the required representation, connection details, tolerances, material grade, and project-specific requirements.
Frequently Asked Questions
What is the OD of 1 1/4 inch Schedule 5S pipe?
The listed outside diameter is 42.2 mm. This is the key external dimension for coordinating fittings, supports, penetrations, and CAD layouts.
What are the ID and wall thickness?
The listed inside diameter is 38.9 mm, and the listed wall thickness is 1.65 mm.
What is the dry pipe weight?
The listed pipe weight is 1.65 kg/m. The page also provides a separate value for weight including water.
Is NPS 1 1/4 the same designation as DN32?
For this reference, NPS 1 1/4 and DN32 identify the same nominal pipe size. The actual OD should still be checked from the dimensional data rather than inferred from the nominal designation.
Can Schedule 5S be selected from dimensions alone?
No. The dimensions are useful for layout and comparison, but final schedule selection requires review of pressure, temperature, corrosion allowance, service conditions, project codes, material requirements, and the complete piping design.
What is the related standard reference?
The source identifies ANSI/ASME B36.19 as the stainless steel pipe dimensional reference. Project specifications and procurement documents should also be checked for any additional requirements.