Table 4.4.2.1: (a). Column Formula for Magnesium-Alloy Extruded Open Shapes

MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures

Last Updated 29 Oct 2026

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General Formula^a

$\frac{\mathrm{P}}{\mathrm{A}}=\frac{\mathrm{K}\left(\mathrm{F}_{\mathrm{cy}}\right)^{\mathrm{n}}}{\left(\mathrm{L}^{\prime} / \rho\right)^{\mathrm{m}}}$

(Stress values are in ksi)

Alloy	K	n	m	Max. P/A
AZ31B, AZ61A	2,900	¼	1.5	Fcy
ZK60A-T5	3,300	¼	1.5	0.96 Fcy

aFormula is for members that do not fail by local buckling. See Figure 4.4.2.3(a).

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