AISC ST-Shapes: Dimensions and Section Properties
Browse AISC tees cut from S-shapes. Compare dimensions and section properties.
Steel Section Finder
Search or browse standard steel sections.
Showing AISC · ST Tees · Imperial
AISC Shapes Database v16.0 · 2,299 sections
Searches every available library and shape family. Leave the field empty to browse the filters below.
Filter by series
Showing the most relevant 75 sections.
| Designation | Weight (lb/ft) | Depth, d (in) | Flange width, bf (in) | Area (in²) | Ix (in⁴) | Sx (in³) |
|---|---|---|---|---|---|---|
| ST12x53 | 53 | 12.3 | 7.87 | 15.6 | 216 | 24.1 |
| ST12x60.5 | 60.5 | 12.3 | 8.05 | 17.8 | 259 | 30.1 |
| ST12x40 | 40 | 12 | 7 | 11.7 | 162 | 18.6 |
| ST12x45 | 45 | 12 | 7.13 | 13.2 | 190 | 22.6 |
| ST12x50 | 50 | 12 | 7.25 | 14.7 | 215 | 26.3 |
| ST10x43 | 43 | 10.2 | 7.06 | 12.7 | 124 | 17.2 |
| ST10x48 | 48 | 10.2 | 7.2 | 14.1 | 143 | 20.3 |
| ST10x33 | 33 | 10 | 6.26 | 9.7 | 92.9 | 12.9 |
| ST10x37.5 | 37.5 | 10 | 6.39 | 11 | 109 | 15.8 |
| ST9x27.35 | 27.35 | 9 | 6 | 8.02 | 62.3 | 9.6 |
| ST9x35 | 35 | 9 | 6.25 | 10.3 | 84.5 | 14 |
| ST7.5x21.45 | 21.45 | 7.5 | 5.5 | 6.3 | 32.9 | 5.99 |
| ST7.5x25 | 25 | 7.5 | 5.64 | 7.34 | 40.5 | 7.72 |
| ST6x15.9 | 15.9 | 6 | 5 | 4.65 | 14.8 | 3.3 |
| ST6x17.5 | 17.5 | 6 | 5.08 | 5.12 | 17.2 | 3.95 |
| ST6x20.4 | 20.4 | 6 | 5.25 | 5.96 | 18.9 | 4.27 |
| ST6x25 | 25 | 6 | 5.48 | 7.33 | 25.1 | 6.04 |
| ST5x12.7 | 12.7 | 5 | 4.66 | 3.72 | 7.79 | 2.05 |
| ST5x17.5 | 17.5 | 5 | 4.94 | 5.14 | 12.5 | 3.62 |
| ST4x9.2 | 9.2 | 4 | 4 | 2.7 | 3.49 | 1.14 |
| ST4x11.5 | 11.5 | 4 | 4.17 | 3.38 | 5 | 1.76 |
| ST3x6.25 | 6.25 | 3 | 3.33 | 1.83 | 1.26 | 0.547 |
| ST3x8.6 | 8.6 | 3 | 3.57 | 2.53 | 2.12 | 1.02 |
| ST2.5x5 | 5 | 2.5 | 3 | 1.46 | 0.671 | 0.348 |
| ST2x3.85 | 3.85 | 2 | 2.66 | 1.13 | 0.307 | 0.198 |
| ST2x4.75 | 4.75 | 2 | 2.8 | 1.4 | 0.462 | 0.319 |
| ST1.5x2.85 | 2.85 | 1.5 | 2.33 | 0.83 | 0.114 | 0.097 |
| ST1.5x3.75 | 3.75 | 1.5 | 2.51 | 1.1 | 0.2 | 0.187 |
Family overview
What are AISC ST Tees?
AISC ST-shapes are tees cut from S-shapes for specialty framing. Designations follow depth × weight naming derived from the parent S series. Because S flanges slope, ST geometry differs from WT tees cut from W-shapes. Use this hub to filter ST tees, compare nearby sizes and hand a selection to the calculator.
Designations
Understanding ST Tees designations
ST6×17.5
ST designations follow the depth × weight pattern, such as ST6×17.5, derived from the parent S-shape.
Properties
ST Tees properties explained
These properties are especially relevant when comparing ST Tees. View the complete property glossary.
| Symbol | Property | Units | Why it matters |
|---|---|---|---|
| Weight | Weight | lb/ft, kg/m | Mass per unit length; used for self-weight and economy comparisons |
| d | Overall depth | in, mm | Overall depth and clearance |
| bf | Flange width | in, mm | Overall flange width and lateral behaviour |
| tw | Web thickness | in, mm | Web thickness and shear-related behaviour |
| tf | Flange thickness | in, mm | Flange thickness and flexural/local behaviour |
| A | Cross-sectional area | in², mm² | Total steel cross-sectional area |
| Ix | Moment of inertia (x) | in⁴, mm⁴ | Major-axis flexural stiffness |
| Iy | Moment of inertia (y) | in⁴, mm⁴ | Minor-axis flexural stiffness |
| Sx | Elastic section modulus (x) | in³, mm³ | Elastic bending property about the x-axis |
| Sy | Elastic section modulus (y) | in³, mm³ | Elastic bending property about the y-axis |
| Zx | Plastic section modulus (x) | in³, mm³ | Plastic bending property about the x-axis |
| Zy | Plastic section modulus (y) | in³, mm³ | Plastic bending property about the y-axis |
| rx | Radius of gyration (x) | in, mm | Strong-axis radius of gyration |
| ry | Radius of gyration (y) | in, mm | Weak-axis radius of gyration and lateral stability relevance |
| J | Torsional constant | in⁴, mm⁴ | Torsional constant |
| Cw | Warping constant | in⁶, mm⁶ | Warping constant for lateral-torsional behaviour |
Library summary
Computed ST Tees summary
The current AISC ST Tees library contains 28 sections across 11 nominal-depth series. Published weights range from 2.85 to 60.50 lb/ft , and actual depths range from 1.50 to 12.30 inches .
- Lightest section
- ST1.5X2.85
- Heaviest section
- ST12X60.5
- Ix range
- 0.11 – 259.00 in⁴
- Sx range
- 0.10 – 30.10 in³
Selection
How to compare ST Tees
- Confirm ST versus WT when modern W-derived tees may be preferred.
- Compare stem and flange dimensions carefully.
- Review flexural properties about the intended axis.
- Analyze finalists under consistent loading.
Beam calculator
Analyze this family in Optimal Beam
Select any ST-shape and load it into the Optimal Beam calculator.
Source: AISC Shapes Database v16.0 · Verified July 2026 · View methodology
Questions & answers
ST Tees FAQs
What is an AISC ST-shape?
An ST-shape is a structural tee cut from an S-shape.
How do ST and WT tees differ?
ST tees come from S-shapes with sloping flange heritage; WT tees come from parallel-flange W-shapes.
Can I analyze an ST in Optimal Beam?
Yes. Select the tee and choose Analyze.
Where do ST properties come from?
Properties are imported from the AISC Shapes Database edition shown in the source note.