MC8×20 MC channel

Detailing dimensions and section properties from the AISC Shapes Database, 16th Edition. Values are shown to the nearest 1/16 in. as they appear on a shop drawing.

MC8×20 measures 8 in. deep with a 3 in. flange and a 3/8 in. web.

At 20 lb per foot it is one of the 5 MC8 sizes, which run from 8.5 to 22.8 lb/ft.

For strong-axis bending its section modulus is Sx = 13.6 in³ and its moment of inertia Ix = 54.4 in⁴, with a plastic modulus Zx = 16.4 in³.

Detailing dimensions

Depth (d)8"
Flange width (bf)3"
Web thickness (tw)3/8"
Avg flange thickness (tf)1/2"
k (detailing)1 1/8"

Section properties

Weight20 lb/ft
Area (A)5.87 in²
Ix54.4 in⁴
Sx13.6 in³
Zx16.4 in³
rx3.04 in
Iy4.42 in⁴
Sy2.02 in³
Zy3.86 in³
ry0.867 in
J0.441 in⁴

Other MC8 sizes

Same nominal size, different weight — useful when you are checking a substitution or a lighter section.

MC8×8.5MC8×18.7MC8×21.4MC8×22.8

Similar weight MC channels

Comparable 20 lb/ft sections in other MC channel sizes.

MC7×19.119.1 lb/ft · Sx 12.3 in³MC6×1818 lb/ft · Sx 9.89 in³MC10×2222 lb/ft · Sx 20.5 in³MC7×22.722.7 lb/ft · Sx 13.5 in³MC6×16.316.3 lb/ft · Sx 8.66 in³MC9×23.923.9 lb/ft · Sx 18.9 in³MC6×15.315.3 lb/ft · Sx 8.44 in³MC6×15.115.1 lb/ft · Sx 8.3 in³

Detailing values are rounded to the nearest 1/16 in. per the AISC Steel Construction Manual. Verify critical dimensions against the current Manual before fabrication. Need MC8×20 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: MC channels · Steel Beam Size Chart

Interactive drawing