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  • FF-S-111 Military Spec Fasteners

    • FF-S-111 Military Specifications Fasteners

    Mil spec FF-S-111 covers single and double-threaded wood screws with round, flat countersunk and oval countersunk heads having slotted or cross-recessed drives.

    Types

    • Type I – Single thread
    • Type II – Double thread

    Styles

    • 1s – Round head, slotted drive
    • 1c – Round head, cross-recessed drive
    • 2s – Flat countersunk head, slotted drive
    • 2c – Flat countersunk head, cross-recessed drive
    • 6s – Oval countersunk head, slotted drive
    • 6c – Oval countersunk head, cross-recessed drive