Steel Beam Sizes / AISC / W-Shapes / W18 / W18x258

W18x258 Steel Beam Dimensions and Properties

AISC Wide flange · v16.0

Analyze in Beam Calculator Back to W-Shapes All W18

Diagram, properties emphasis, and nearby alternatives use the selected unit system.

Units

Section diagram

W18x258 dimensions

Not to scale. Dimensions shown for reference.

Section properties

Symbols match the steel section finder. Imperial and metric values are shown side by side.

Property Imperial Metric
Weight 258.00 lb/ft 384.00 kg/m
Depth, d 21.50 in 546.00 mm
Flange width, bf 11.80 in 300.00 mm
tw 1.280 in 32.500 mm
tf 2.300 in 58.400 mm
Area 76.00 in² 49,000.00 mm²
Ix 5,510.00 in⁴ 2,290,000,000 mm⁴
Iy 628.00 in⁴ 261,000,000 mm⁴
Sx 514.00 in³ 8,420,000 mm³
Sy 107.00 in³ 1,750,000 mm³
Zx 611.00 in³ 10,000,000 mm³
Zy 166.00 in³ 2,720,000 mm³
rx 8.53 in 217.00 mm
ry 2.88 in 73.20 mm
J 103.00 in⁴ 42,900,000 mm⁴
Cw 57,600.00 in⁶ 15,500,000,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus W18x258.

Browse W18 series →

Lighter in W18

W18x234

Weight
234.0 lb/ft (-9.3%)
Depth
21.10 in (-1.9%)
Ix
4,900.0 in⁴ (-11%)

Heavier in W18

W18x283

Weight
283.0 lb/ft (+9.7%)
Depth
21.90 in (+1.9%)
Ix
6,170.0 in⁴ (+12%)

Closest Iₓ in W18

W18x211

Weight
211.0 lb/ft (-18%)
Depth
20.70 in (-3.7%)
Ix
4,330.0 in⁴ (-21%)

Similar weight in W21

W21x248

Weight
248.0 lb/ft (-3.9%)
Depth
23.70 in (+10%)
Ix
6,830.0 in⁴ (+24%)
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Source: AISC Shapes Database v16.0 · Methodology