Common context
Common project roles include deep foundations, pile-supported structures, retaining systems, marine work, and heavy civil or industrial foundations.
AISC v16.0 · HP shape
HP18X181
HP18X181 weighs 181 lb/ft, has a depth of 18 in, a cross-sectional area of 53.2 in², and an x-axis elastic section modulus Sx of 336 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
- 181 lb/ft
- Area
- 53.2 in²
- Depth
- 18 in
- Elastic Sx
- 336 in³
From designation to geometry
Reading the HP18X181 record
The 18 in depth series in HP18X181 is a designation. The tabulated depth d is 18 in and flange width bf is 18 in. The separately listed detailing depth ddet is 18 in.
The web thickness tw is 1 in and flange thickness tf is 1 in. Keep the exact designation with these dimensions: matching the depth series does not guarantee matching flanges, web geometry or connection fit.
Ix = 3,020 in⁴ and Iy = 974 in⁴ refer to the database x- and y-axes. Here Ix is numerically larger. 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 HP18X181
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 × 181 lb/ft | 3,620 lb | 1,642.004 kg |
| 3 pieces | 3 × 3,620 lb | 10,860 lb | 4,926.013 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 bearing pile shape?
An HP-shape is a hot-rolled bearing-pile section proportioned for driven foundation service. Its geometry is intended to perform as a pile and differs from ordinary building-column selection even when the cross-section looks similar to a wide-flange shape.
Learn how shape properties workDetailing watch
Coordinate pile points, splices, cutoff elevations, driving criteria, corrosion allowance, cap or base connections, handling, and the geotechnical and structural requirements that control the installation.
Portable reference files
Download HP18X181 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
DXF, SVG, EPS, HPGL, PDF, PNG, WebP, CSV, XLSX, JSON, XML, YAML, TXT, and Markdown in one ZIP.
Choose a format. Files stay in your browser and are not uploaded.
Dimensions & properties
HP18X181 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
- 181 lb/ft
- A Area
- 53.2 in²
- d Depth / angle leg dimension d
- 18 in
- ddet Detailing depth
- 18 in
- bf Flange width
- 18 in
- bfdet Detailing flange width
- 18 in
- tw Web thickness
- 1 in
- twdet Detailing web thickness
- 1 in
- tf Flange thickness
- 1 in
- tfdet Detailing flange thickness
- 1 in
- kdes Design k distance
- 2.18 in
- kdet Detailing k distance
- 2.188 in
- k1 Web-toe k distance
- 1.688 in
Centroid & detailing
- T Detailing T distance
- 13.5 in
- WGi Workable gage, inner
- 7.5 in
X-axis properties
- Ix X-axis moment of inertia
- 3,020 in⁴
- Zx X-axis plastic section modulus
- 379 in³
- Sx X-axis elastic section modulus
- 336 in³
- rx X-axis radius of gyration
- 7.53 in
- rts Effective radius of gyration
- 4.96 in
- ho Flange centroid distance
- 17 in
Y- and z-axis properties
- Iy Y-axis moment of inertia
- 974 in⁴
- Zy Y-axis plastic section modulus
- 167 in³
- Sy Y-axis elastic section modulus
- 108 in³
- ry Y-axis radius of gyration
- 4.28 in
Torsion, warping & perimeters
- J Torsional constant
- 20.7 in⁴
- Cw Warping constant
- 70,400 in⁶
- PA Shape perimeter PA
- 86 in
- PB Shape perimeter PB
- 104 in
- PC Shape perimeter PC
- 54 in
- PD Shape perimeter PD
- 72 in
Compare published reference values
HP18X181 alongside nearby HP 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) | Depth (in) | Area (in²) | Ix (in⁴) | Iy (in⁴) |
|---|---|---|---|---|---|
| HP18X181 (this record) | 181 | 18 | 53.2 | 3,020 | 974 |
| HP18X204 | 204 | 18.3 | 60.2 | 3,480 | 1,120 |
| HP18X157 | 157 | 17.7 | 46.2 | 2,570 | 833 |
Relative to HP18X181, HP18X204 changes nominal weight by +23 lb/ft, listed depth by +0.3 in, and area by +7 in². At the same hypothetical 20 ft length, the nominal weight difference is +460 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