AISC 360-22ASTM A992 / A6W21 Series
AISC W21x73 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 | 73 lb/ft | 108.6 kg/m |
| Cross-Sectional Area | A | 21.5 in² | 13871 mm² |
| Overall Depth | d | 21.2 in | 538.5 mm |
| Flange Width | bf | 8.3 in | 210.8 mm |
| Flange Thickness | tf | 0.74 in | 18.8 mm |
| Web Thickness | tw | 0.455 in | 11.6 mm |
| Flange Centroid Distance | ho | 20.5 in | 520.7 mm |
Bending & Buckling Properties
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Strong-Axis Inertia | Ix | 1600 in⁴ | 666 ×10⁶ mm⁴ |
| Strong-Axis Elastic Modulus | Sx | 151 in³ | 2474 ×10³ mm³ |
| Strong-Axis Plastic Modulus | Zx | 172 in³ | 2819 ×10³ mm³ |
| Strong-Axis Radius of Gyration | rx | 8.64 in | 219.5 mm |
| Weak-Axis Inertia | Iy | 70.6 in⁴ | 29.4 ×10⁶ mm⁴ |
| Weak-Axis Elastic Modulus | Sy | 17 in³ | 279 ×10³ mm³ |
| Weak-Axis Plastic Modulus | Zy | 26.6 in³ | 436 ×10³ mm³ |
| Weak-Axis Radius of Gyration | ry | 1.81 in | 46 mm |
| Torsional Constant | J | 3.02 in⁴ | 1257 ×10³ mm⁴ |
| Warping Constant | Cw | 11662.9 in⁶ | 1989.9 ×10⁹ mm⁶ |
| Effective Radius of Gyration | rts | 2.19 in | 55.6 mm |
AISC 360-22 Design Capacities (Fy = 50 ksi / 345 MPa)
Plastic Moment Capacity (φMp)
645 kip-ft
875.2 kN·m (φ = 0.90)Nominal Shear Capacity (φVn)
260.4 kips
1159.4 kN (φ = 0.90)Flange Slenderness (λf = bf / 2tf)
5.61
✓ Compact Flange (λf ≤ 9.15)Web Slenderness (λw = h / tw)
43.3
✓ Compact Web (λw ≤ 90.5)