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FF-B-588D
Federal Spec for Bolt, Toggle and Expansion Sleeve, Screw (2 Oct, 1989) Toggle bolts and screw expansion sleeves covered by this specification are self-contained anchoring devices with wings which automatically open or swing in place after being pushed through an open hole accessible from one side only. Plastic screw anchors are screw activated devices which expand inside a hollow wall and accept a sheet metal screw.