AISC 360-22ASTM A992 / A6W21 Series
AISC W21x50 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 | 50 lb/ft | 74.4 kg/m |
| Cross-Sectional Area | A | 14.7 in² | 9484 mm² |
| Overall Depth | d | 20.8 in | 528.3 mm |
| Flange Width | bf | 6.53 in | 165.9 mm |
| Flange Thickness | tf | 0.535 in | 13.6 mm |
| Web Thickness | tw | 0.38 in | 9.7 mm |
| Flange Centroid Distance | ho | 20.3 in | 515.6 mm |
Bending & Buckling Properties
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Strong-Axis Inertia | Ix | 984 in⁴ | 409.6 ×10⁶ mm⁴ |
| Strong-Axis Elastic Modulus | Sx | 94.5 in³ | 1549 ×10³ mm³ |
| Strong-Axis Plastic Modulus | Zx | 110 in³ | 1803 ×10³ mm³ |
| Strong-Axis Radius of Gyration | rx | 8.18 in | 207.8 mm |
| Weak-Axis Inertia | Iy | 24.9 in⁴ | 10.4 ×10⁶ mm⁴ |
| Weak-Axis Elastic Modulus | Sy | 7.6 in³ | 125 ×10³ mm³ |
| Weak-Axis Plastic Modulus | Zy | 12.2 in³ | 200 ×10³ mm³ |
| Weak-Axis Radius of Gyration | ry | 1.3 in | 33 mm |
| Torsional Constant | J | 1.14 in⁴ | 475 ×10³ mm⁴ |
| Warping Constant | Cw | 4045 in⁶ | 690.1 ×10⁹ mm⁶ |
| Effective Radius of Gyration | rts | 1.64 in | 41.7 mm |
AISC 360-22 Design Capacities (Fy = 50 ksi / 345 MPa)
Plastic Moment Capacity (φMp)
412.5 kip-ft
559.7 kN·m (φ = 0.90)Nominal Shear Capacity (φVn)
213.4 kips
950 kN (φ = 0.90)Flange Slenderness (λf = bf / 2tf)
6.1
✓ Compact Flange (λf ≤ 9.15)Web Slenderness (λw = h / tw)
51.9
✓ Compact Web (λw ≤ 90.5)