Steel Beam Sizes / AISC / MC Channels / MC8x21.4

MC8x21.4 Steel Beam Dimensions and Properties

AISC Miscellaneous channels · v16.0

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

Units

Section diagram

MC8x21.4 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 21.40 lb/ft 31.80 kg/m
Depth, d 8.00 in 203.00 mm
Flange width, bf 3.45 in 87.60 mm
tw 0.375 in 9.530 mm
tf 0.525 in 13.300 mm
Area 6.28 in² 4,050.00 mm²
Ix 61.50 in⁴ 25,600,000 mm⁴
Iy 6.58 in⁴ 2,740,000 mm⁴
Sx 15.40 in³ 252,000.00 mm³
Sy 2.71 in³ 44,400.00 mm³
Zx 18.20 in³ 298,000.00 mm³
Zy 5.18 in³ 84,900.00 mm³
rx 3.13 in 79.50 mm
ry 1.02 in 25.90 mm
J 0.50 in⁴ 206,000.00 mm⁴
Cw 70.80 in⁶ 19,000,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus MC8x21.4.

Lighter in MC8

MC8x20

Weight
20.0 lb/ft (-6.5%)
Depth
8.00 in (0.0%)
Ix
54.4 in⁴ (-12%)

Heavier in MC8

MC8x22.8

Weight
22.8 lb/ft (+6.5%)
Depth
8.00 in (0.0%)
Ix
63.8 in⁴ (+3.7%)

Closest Iₓ in MC8

MC8x18.7

Weight
18.7 lb/ft (-13%)
Depth
8.00 in (0.0%)
Ix
52.4 in⁴ (-15%)

Similar weight in MC7

MC7x22.7

Weight
22.7 lb/ft (+6.1%)
Depth
7.00 in (-13%)
Ix
47.4 in⁴ (-23%)
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Source: AISC Shapes Database v16.0 · Methodology