AISC 360-22ASTM A992 / A6W21 Series
AISC W21x68 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 | 68 lb/ft | 101.2 kg/m |
| Cross-Sectional Area | A | 20 in² | 12903 mm² |
| Overall Depth | d | 21.1 in | 535.9 mm |
| Flange Width | bf | 8.27 in | 210.1 mm |
| Flange Thickness | tf | 0.685 in | 17.4 mm |
| Web Thickness | tw | 0.43 in | 10.9 mm |
| Flange Centroid Distance | ho | 20.4 in | 518.2 mm |
Bending & Buckling Properties
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Strong-Axis Inertia | Ix | 1480 in⁴ | 616 ×10⁶ mm⁴ |
| Strong-Axis Elastic Modulus | Sx | 140 in³ | 2294 ×10³ mm³ |
| Strong-Axis Plastic Modulus | Zx | 160 in³ | 2622 ×10³ mm³ |
| Strong-Axis Radius of Gyration | rx | 8.6 in | 218.4 mm |
| Weak-Axis Inertia | Iy | 64.7 in⁴ | 26.9 ×10⁶ mm⁴ |
| Weak-Axis Elastic Modulus | Sy | 15.7 in³ | 257 ×10³ mm³ |
| Weak-Axis Plastic Modulus | Zy | 24.4 in³ | 400 ×10³ mm³ |
| Weak-Axis Radius of Gyration | ry | 1.8 in | 45.7 mm |
| Torsional Constant | J | 2.45 in⁴ | 1020 ×10³ mm⁴ |
| Warping Constant | Cw | 10639.8 in⁶ | 1815.3 ×10⁹ mm⁶ |
| Effective Radius of Gyration | rts | 2.17 in | 55.1 mm |
AISC 360-22 Design Capacities (Fy = 50 ksi / 345 MPa)
Plastic Moment Capacity (φMp)
600 kip-ft
814.1 kN·m (φ = 0.90)Nominal Shear Capacity (φVn)
245 kips
1090.5 kN (φ = 0.90)Flange Slenderness (λf = bf / 2tf)
6.04
✓ Compact Flange (λf ≤ 9.15)Web Slenderness (λw = h / tw)
45.9
✓ Compact Web (λw ≤ 90.5)