Common context
Common project roles include columns, braces, posts, rails, supports, and exposed round framing where the specified pipe product is appropriate.
AISC v16.0 · PIPE shape
Pipe18XS
Pipe18XS weighs 93.5 lb/ft, has a outside diameter of 18 in, a cross-sectional area of 24.8 in², and an x-axis elastic section modulus Sx of 106 in³. Open the full US customary property record or generate 2D, data, report, and 3D reference files locally in your browser.
Nominal profile
Units · inches
Building nominal profile…
- Weight
- 93.5 lb/ft
- Area
- 24.8 in²
- Outside diameter
- 18 in
- Elastic Sx
- 106 in³
From designation to geometry
Reading the Pipe18XS record
The Manual label Pipe18XS and electronic designation Pipe18XS identify this pipe record. Nominal pipe size is an identifier: use the listed OD = 18 in and ID = 17.1 in for the reference envelope.
The record contains tnom = 0.5 in and tdes = 0.465 in. Keep the listed wall fields and schedule or weight-class identifier together; a pipe label alone does not establish the project material specification.
Ix = 956 in⁴ and Iy = 956 in⁴ refer to the database x- and y-axes. The two listed values are equal. Axis letters are labels, not a guarantee that x is always the larger axis. These are geometric properties, not allowable loads or complete member capacities.
Match the axis and dimension conventions to the figures in the AISC v16.0 workbook Readme. The profile above simplifies manufacturing geometry; its outline is not used to recalculate the published properties.
Worked quantity example
Nominal weight for Pipe18XS
Assume 3 pieces, each 20 ft (6.096 m) long. This is a hypothetical quantity example, not a stock-length or lifting recommendation.
| Quantity | Calculation | Nominal pounds | Kilogram equivalent |
|---|---|---|---|
| One 20 ft piece | 20 ft × 93.5 lb/ft | 1,870 lb | 848.218 kg |
| 3 pieces | 3 × 1,870 lb | 5,610 lb | 2,544.653 kg |
Conversion: 1 lb = 0.45359237 kg; displayed results are rounded. This multiplication excludes connection plates, bolts, weld metal, coatings, cutting allowances and actual material variation. Use the material takeoff for your own lengths and quantities.
Shape family context
What is a structural pipe section?
A PIPE entry describes a circular section using nominal pipe size and a schedule or weight class. Its outside diameter may remain constant across schedules while wall thickness, inside diameter, weight, and properties change.
Learn how shape properties workDetailing watch
Verify product specification, schedule, wall thickness, end preparation, connection fit, galvanizing or venting, and do not assume pipe and round HSS requirements are interchangeable.
Portable reference files
Download Pipe18XS your way.
Every file is generated locally in your browser from the same nominal profile and AISC v16.0 reference record.
CAD, vector, and image
Use the profile in CAD, illustration, plotting, reports, or presentations.
Tables and portable data
Take a printable datasheet, spreadsheet, structured record, or plain-text table.
Extrude a nominal member
Enter a member length in inches. Mesh files are generated from the nominal reference profile.
One-click package
Complete 2D + data bundle
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Dimensions & properties
Pipe18XS reference data.
Values below are derived from the AISC Shapes Database v16.0 in US customary units. A dash indicates that a property is not applicable or not included for this family.
Nominal dimensions
- W Nominal weight
- 93.5 lb/ft
- A Area
- 24.8 in²
- OD Outside diameter
- 18 in
- ID Inside diameter
- 17.1 in
- tnom Nominal wall thickness
- 0.5 in
- tdes Design wall thickness
- 0.465 in
X-axis properties
- Ix X-axis moment of inertia
- 956 in⁴
- Zx X-axis plastic section modulus
- 139 in³
- Sx X-axis elastic section modulus
- 106 in³
- rx X-axis radius of gyration
- 6.21 in
Y- and z-axis properties
- Iy Y-axis moment of inertia
- 956 in⁴
- Zy Y-axis plastic section modulus
- 139 in³
- Sy Y-axis elastic section modulus
- 106 in³
- ry Y-axis radius of gyration
- 6.21 in
Torsion, warping & perimeters
- J Torsional constant
- 1,910 in⁴
Compare published reference values
Pipe18XS alongside nearby PIPE records
These records share the same nominal series, outside envelope or leg arrangement, depending on the family. Peers are ordered by absolute weight difference, then listed depth and designation. The table does not rank structural performance or approve a substitution.
| Record | Weight (lb/ft) | Outside diameter (in) | Area (in²) | Ix (in⁴) | Iy (in⁴) |
|---|---|---|---|---|---|
| Pipe18XS (this record) | 93.5 | 18 | 24.8 | 956 | 956 |
| Pipe18STD | 70.7 | 18 | 19.4 | 756 | 756 |
Relative to Pipe18XS, Pipe18STD changes nominal weight by -22.8 lb/ft, listed outside diameter by 0 in, and area by -5.4 in². At the same hypothetical 20 ft length, the nominal weight difference is -456 lb.
Open these records in the full comparison tool
Compare the remaining dimensions, axis conventions, grade, availability and project requirements separately. Weight or section-property similarity does not establish matching connection geometry or member capacity.
Data is derived from the AISC Shapes Database v16.0, consistent with the AISC Steel Construction Manual, 16th Edition, 1st Printing. AISC advises professional verification before use in a specific application. The downloadable DXF is a nominal reference profile and may simplify rolled fillets, flange tapers, angle radii, HSS corner radii, and other manufacturing geometry. Verify all dimensions and suitability before design, detailing, ordering, or fabrication.
From reference to deliverable