Formulas: mechanically fastened joints

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

Last Updated 29 Oct 2026

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Formula 1

The following interaction formula is applicable to AN3 series bolts under combined shear and tension loading: $\mathrm{R}_{\mathrm{s}}^{3}+\mathrm{R}_{\mathrm{t}}^{2}=1.0$ , where $\mathrm{R}_{\mathrm{s}}$ and $\mathrm{R}_{\mathrm{t}}$ are ratios of applied load to allowable load in shear and tension, respectively.

\mathrm{R}_{\mathrm{s}}^{3}+\mathrm{R}_{\mathrm{t}}^{2}=1.0

Found in

MECHANICALLY FASTENED JOINTS