C – standard channels

C250x30

Standard: ASTM A6/A6M (désignations métriques)Source: SI values from the AISC v16.0 database (ASTM A6 shapes common to Canada)
ASTM A6 rolled shapes are the same in Canada; the CISC list may differ slightly (availability).
xybf = 69.6d = 254tf = 11.1tf = 11.1tw = 9.63tw = 9.63
Cross-section, to scaledimensions in mm

Dimensions

Depthd
254mm
Flange widthbf
69.6mm
Web thicknesstw
9.63mm
Flange thicknesstf
11.1mm
Distance k (design)kdes
25.4mm
Distance k (detailing)kdet
27mm
Web clear depthT
203mm
Distance between flange centroidsho
243mm

Mass and area

Mass per lengthm
30kg/m
Cross-sectional areaA
3,790mm²

Strong axis x–x

Moment of inertiaIx
32.810⁶ mm⁴
Elastic section modulusSx
25910³ mm³
Plastic section modulusZx
31810³ mm³
Radius of gyrationrx
93.2mm

Weak axis y–y

Moment of inertiaIy
1.1710⁶ mm⁴
Elastic section modulusSy
21.510³ mm³
Plastic section modulusZy
44.210³ mm³
Radius of gyrationry
17.5mm

Torsion and stability

Torsional constantJ
15310³ mm⁴
Warping constantCw
15.310⁹ mm⁶
Effective radius of gyrationrts
22.7mm
Polar radius (shear center)r̄o
99.8mm
Flexural constantH
0.9
Shear centereo
16.2mm

Centers

Centroidx̄
15.4mm
Plastic neutral axisxp
7.47mm

Slenderness ratios

Web slendernessh/tw
21.6
Wall slendernessb/t
6.28

Equivalents in other standards