AISC 360-22ASTM A992 / A6W21 Series
AISC W21x122 Properties & Dimensions
Standard wide flange I-beam cross-section properties, geometric dimensions, and LRFD design capacities per AISC Steel Construction Manual 15th/16th Edition.
Cross-Section Technical Schematic
Dual Units: Imperial (US) · SI MetricGeometric Dimensions & Area
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Nominal Weight | w | 122 lb/ft | 181.6 kg/m |
| Cross-Sectional Area | A | 35.9 in² | 23161 mm² |
| Overall Depth | d | 21.7 in | 551.2 mm |
| Flange Width | bf | 12.4 in | 315 mm |
| Flange Thickness | tf | 0.96 in | 24.4 mm |
| Web Thickness | tw | 0.6 in | 15.2 mm |
| Flange Centroid Distance | ho | 20.7 in | 525.8 mm |
Bending & Buckling Properties
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Strong-Axis Inertia | Ix | 2960 in⁴ | 1232 ×10⁶ mm⁴ |
| Strong-Axis Elastic Modulus | Sx | 273 in³ | 4474 ×10³ mm³ |
| Strong-Axis Plastic Modulus | Zx | 307 in³ | 5031 ×10³ mm³ |
| Strong-Axis Radius of Gyration | rx | 9.09 in | 230.9 mm |
| Weak-Axis Inertia | Iy | 305 in⁴ | 127 ×10⁶ mm⁴ |
| Weak-Axis Elastic Modulus | Sy | 49.2 in³ | 806 ×10³ mm³ |
| Weak-Axis Plastic Modulus | Zy | 75.6 in³ | 1239 ×10³ mm³ |
| Weak-Axis Radius of Gyration | ry | 2.92 in | 74.2 mm |
| Torsional Constant | J | 8.98 in⁴ | 3738 ×10³ mm⁴ |
| Warping Constant | Cw | 51467.8 in⁶ | 8781.1 ×10⁹ mm⁶ |
| Effective Radius of Gyration | rts | 3.4 in | 86.4 mm |
AISC 360-22 Design Capacities (Fy = 50 ksi / 345 MPa)
Plastic Moment Capacity (φMp)
1151.3 kip-ft
1562.1 kN·m (φ = 0.90)Nominal Shear Capacity (φVn)
351.5 kips
1564.9 kN (φ = 0.90)Flange Slenderness (λf = bf / 2tf)
6.46
✓ Compact Flange (λf ≤ 9.15)Web Slenderness (λw = h / tw)
33
✓ Compact Web (λw ≤ 90.5)