Weatherproof fastener

The combination of a screw rotatable between a position in which it does not join two pieces of work and another position in which it joins two or more pieces of work, and a gasket positioned between said screw and said work to enable said screw to maintain said work in a tight substantially weatherproof grasp,

• said screw comprising an elongated shaft having screw threads formed along at least a portion of its periphery and terminating at one end in a tip for penetrating said work,
• a screw head mounted at the end of said shaft opposite said tip, said head being formed with an outer surface extending general away from said shaft, said outer surface terminating in an annular lip depending from said outer surface in the direction of said shaft, said lip lying in a plane substantially normal to the axis of said shaft which plane constitutes the lowermost extension of said head,
• said outer surface and said lip forming between them a head body having a recess defined by the inner surface of said body and the inner surface of said lip, said body inner surface being substantially flat and lying in a plane substantially normal to the axis of said shaft, said lip inner surface being substantially annular and intersecting said body inner surface at an obtuse angle of between about 100 and 150 degrees, and
• said gasket comprising a deformable, electrically non-conductive article positioned in said head body recess and, when said screw is in non-work joining position, being located contiguous with said body inner surface and spaced from said lip inner surface when said screw is in non-joining position, and, when said screw is in work joining position, deformed to fill said recess and be contiguous with both said head body and lip inner surfaces and to extend beyond said plane of said annular lip to prevent contact between said head and said work.