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  • FF-S-86 Military Spec Fasteners

    • FF-S-86 Military Specifications Fasteners

    Mil spec FF-S-86 covers socket head cap screw fasteners with optional hexagon and spline socket configurations.

    • Type I – Hex socket cylindrical (1936)*
    • Type III – Spline cylindrical (1936)*
    • Type IV – Hex flat countersunk
    • Type V – Spline flat countersunk
    • Type VI – Hex cylindrical (1960)
    • Type VII – Spline cylindrical (1960)
    • Type VIII – Hex button
    • Type IX – Spline button

    * Not for new design