Steel Beam Sizes / CISC / W-Shapes / W310×21

W310×21 Steel Beam Dimensions and Properties

CISC Wide flange · v12.1

Analyze in Beam Calculator Back to W-Shapes

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

Units

Section diagram

W310×21 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 14.00 lb/ft 21.00 kg/m
Depth, d 11.93 in 303.00 mm
Flange width, bf 3.98 in 101.00 mm
tw 0.201 in 5.100 mm
tf 0.224 in 5.700 mm
Area 4.17 in² 2,690.00 mm²
Ix 88.89 in⁴ 37,000,000 mm⁴
Iy 2.36 in⁴ 983,000.00 mm⁴
Sx 14.89 in³ 244,000.00 mm³
Sy 1.19 in³ 19,500.00 mm³
Zx 17.51 in³ 287,000.00 mm³
Zy 1.90 in³ 31,200.00 mm³
rx 4.61 in 117.00 mm
ry 0.75 in 19.10 mm
J 0.07 in⁴ 29,400.00 mm⁴
Cw 80.81 in⁶ 21,700,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus W310×21.

Heavier in W310

W310×24

Weight
24.0 kg/m (+14%)
Depth
305.0 mm (+0.7%)
Ix
42,700,000 mm⁴ (+15%)

Closest Iₓ in W310

W310×28

Weight
28.0 kg/m (+36%)
Depth
309.0 mm (+2.0%)
Ix
54,300,000 mm⁴ (+47%)

Similar weight in W250

W250×22

Weight
22.0 kg/m (+7.1%)
Depth
254.0 mm (-16%)
Ix
28,900,000 mm⁴ (-22%)
Analyze in Beam Calculator Compare in W-Shapes finder

Source: CISC Structural Section Tables SST12.1 · v12.1 · Availability: Imported; readily available in Canada. · Methodology