Abstract: A screw has a generally flat washer-like head. On an underside of the head are a plurality of cutters or cutting wedges arranged circumferentially around the shank of the screw. The cutters cut or carve off material when the screw is inserted into a fibrous material like wood to thereby facilitate countersinking of the screw head. The cutters may be triangular or quadrilateral wedges. One or more pockets are disposed radially inwardly of the cutters for receiving fibrous material to help lock the screw in place, i.e. to prevent the screw from loosening over time. These pockets may circularly shaped pockets disposed circumferentially around the shank. Alternatively, a single annular pocket may be provided around the shank.

Abstract: A screw fastener having a head, threaded shank with compound, divided threads and tip end has an upper thread surface extending at a substantially flat angle from a normal to a longitudinal axis of the screw which diverts upwardly to a first peripheral edge defining a cupped or concave upper thread surface and a lower thread surface extending upwardly to a second peripheral edge, with a radially inward recess between first and second edges. The screw exhibits significantly increased pull-out resistance.

Abstract: A self-countersinking, self-tapping screw has a head with a substantially flat underside that acts like a washer for bearing against a surface of a material into which the screw is inserted. On an underside of the head are one or more material-receiving pockets. These pockets receive material when the head of the screw bears against the surface. These pockets thus help lock the screw in place, i.e. help to prevent the screw from loosening over time. These pockets may have a circular or non-circular shape.

Abstract: A screw fastener having a head, threaded shank with compound, divided threads and tip end has an upper thread surface extending at a substantially flat angle from a normal to a longitudinal axis of the screw which diverts upwardly to a first peripheral edge defining a cupped or concave upper thread surface and a lower thread surface extending upwardly to a second peripheral edge, with a radially inward recess between first and second edges. The screw exhibits significantly increased pull-out resistance.

Abstract: A self-countersinking screw (10) is capable of full penetration into wood, plastic veneered wood, and cementaceous products. An alternating sequence of peripheral cutters (A, B) extend from the periphery of the underside of the screw head (11), acting in conjunction with countersink cutting edges (24) and debris receiving recesses (20). Cutter (A) has an arcuate notch (30) in the cutting face (28), cutter (B) has a rectangular notch (31) in the trailing edge. Full countersinking without tearing, cracking or dimpling of the surface is achieved.

Abstract: A screw has a generally flat was head. On an underside of the head are a plurality of cutters or cutting wedges arranged circumferentially around the shank of the screw. The cutters cut or carve off material when the screw is inserted into a fibrous material like wood to thereby facilitate countersinking of the screw head. The cutters may be triangular or quadrilateral wedges. One or more pockets are disposed radially inwardly of the cutters for receiving fibrous material to help lock the screw in place, i.e. prevent the screw from loosening over time. These pockets may circularly shaped pockets disposed circumferentially around the shank. Alternatively, a single annular pocket may be provided around the shank.

Abstract: A self-countersinking, self-tapping screw has a head with a substantially flat underside that acts like a washer for bearing against a surface of a material into which the screw is inserted. On an underside of the head are one or more material-receiving pockets. These pockets receive material when the head of the screw bears against the surface. These pockets thus help lock the screw in place, i.e. help to prevent the screw from loosening over time. These pockets may have a circular or non-circular shape.

Abstract: A screw has a generally flat washer-like head. On an underside of the head are a plurality of cutters or cutting wedges arranged circumferentially around the shank of the screw. The cutters cut or carve off material when the screw is inserted into a fibrous material like wood to thereby facilitate countersinking of the screw head. The cutters may be triangular or quadrilateral wedges. One or more pockets are disposed radially inwardly of the cutters for receiving fibrous material to help lock the screw in place, i.e. to prevent the screw from loosening over time. These pockets may circularly shaped pockets disposed circumferentially around the shank. Alternatively, a single annular pocket may be provided around the shank.

Abstract: A self-countersinking screw (10) is capable of full penetration into wood, plastic veneered wood, and cementaceous products. An alternating sequence of peripheral cutters (A, B) extend from the periphery of the underside of the screw head (11), acting in conjunction with countersink cutting edges (24) and debris receiving recesses (20). Cutter (A) has an arcuate notch (30) in the cutting face (28), cutter (B) has a rectangular notch (31) in the trailing edge. Full countersinking without tearing, cracking or dimpling of the surface is achieved.

Abstract: A bracket for mounting a deck ledger board to a building surface includes a spacer portion having a first panel adapted to engage a building surface and a second panel connected to and spaced from said first panel by a selected distance. A ledger board retainer is connected to the spacer portion and defines therewith a generally U shaped region for receiving a ledger board therein in close juxtaposition to the spacer portion. The bracket ensures proper drainage of moisture from regions between the ledger board and the building surface.

Abstract: The thread (15) of a wood or the like screw has pairs of V-shaped recesses (22, 23) in the edge of a selected intermediate length of the thread (17). Each pair defines a W-shaped cutout (19, 20, 11). The cutouts (19-21) extend into only a part of radial width of the thread (15). There are only about five cutouts (19-21) at each convolute (17) of the limited length. The lengths of the thread portion (16) at the tip and the thread portion (18) at the head (13) of the screw are devoid of the cutouts. Each cutout defines a cutting tooth (24) which facilitates the driving of the screw into the workpiece. The recesses (22, 23) provide cavities for fibrous debris generated by the respective tooth (24). When the screw is in place, the teeth (24) are pressed axially toward the thread produced in the workpiece to reduce the loosening tendency of the installed screw. The disposition and size of the cutouts (19-21), is about three cutouts per one convolute so as not to unduly impede the torque strength of the screw.