AISC 360-22ASTM A992 / A6W21 Series
AISC W21x48 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 | 48 lb/ft | 71.4 kg/m |
| Cross-Sectional Area | A | 14.1 in² | 9097 mm² |
| Overall Depth | d | 20.6 in | 523.2 mm |
| Flange Width | bf | 8.14 in | 206.8 mm |
| Flange Thickness | tf | 0.43 in | 10.9 mm |
| Web Thickness | tw | 0.35 in | 8.9 mm |
| Flange Centroid Distance | ho | 20.2 in | 513.1 mm |
Bending & Buckling Properties
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Strong-Axis Inertia | Ix | 959 in⁴ | 399.2 ×10⁶ mm⁴ |
| Strong-Axis Elastic Modulus | Sx | 93 in³ | 1524 ×10³ mm³ |
| Strong-Axis Plastic Modulus | Zx | 107 in³ | 1753 ×10³ mm³ |
| Strong-Axis Radius of Gyration | rx | 8.24 in | 209.3 mm |
| Weak-Axis Inertia | Iy | 38.7 in⁴ | 16.1 ×10⁶ mm⁴ |
| Weak-Axis Elastic Modulus | Sy | 9.5 in³ | 156 ×10³ mm³ |
| Weak-Axis Plastic Modulus | Zy | 14.9 in³ | 244 ×10³ mm³ |
| Weak-Axis Radius of Gyration | ry | 1.66 in | 42.2 mm |
| Torsional Constant | J | 0.803 in⁴ | 334 ×10³ mm⁴ |
| Warping Constant | Cw | 6217.1 in⁶ | 1060.7 ×10⁹ mm⁶ |
| Effective Radius of Gyration | rts | 2.05 in | 52.1 mm |
AISC 360-22 Design Capacities (Fy = 50 ksi / 345 MPa)
Plastic Moment Capacity (φMp)
401.3 kip-ft
544.4 kN·m (φ = 0.90)Nominal Shear Capacity (φVn)
194.7 kips
866.6 kN (φ = 0.90)Flange Slenderness (λf = bf / 2tf)
9.47
Non-compact FlangeWeb Slenderness (λw = h / tw)
56.4
✓ Compact Web (λw ≤ 90.5)