M – miscellaneous shapes

M318x18.5

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 = 95.3d = 318tf = 5.79tf = 5.79tw = 3.94tw = 3.94
Cross-section, to scaledimensions in mm

Dimensions

Depthd
318mm
Flange widthbf
95.3mm
Web thicknesstw
3.94mm
Flange thicknesstf
5.79mm
Distance k (design)kdes
14.3mm
Distance k (detailing)kdet
14.3mm
Distance k1k1
9.53mm
Web clear depthT
289mm
Distance between flange centroidsho
312mm

Mass and area

Mass per lengthm
18.5kg/m
Cross-sectional areaA
2,340mm²

Strong axis x–x

Moment of inertiaIx
37.210⁶ mm⁴
Elastic section modulusSx
23310³ mm³
Plastic section modulusZx
27010³ mm³
Radius of gyrationrx
126mm

Weak axis y–y

Moment of inertiaIy
0.83710⁶ mm⁴
Elastic section modulusSy
17.510³ mm³
Plastic section modulusZy
27.510³ mm³
Radius of gyrationry
18.9mm

Torsion and stability

Torsional constantJ
20.510³ mm⁴
Warping constantCw
20.410⁹ mm⁶
Effective radius of gyrationrts
23.7mm

Slenderness ratios

Flange slendernessbf/2tf
8.22
Web slendernessh/tw
74.8

Equivalents in other standards