Wood screw

A wood screw, comprising:

• a head end, a shank and a tapered end, the head end including a tool engaging part, the head end located at a first end of the shank and the tapered end located at a second end of the shank;
• a thread formed along the shank, wherein the thread begins on the tapered end, extends onto the shank and toward the head end;
• and
• wherein the thread includes a peripheral edge, and an initial axial segment comprising multiple thread turns and along which the peripheral edge includes a plurality of notches, and a following axial segment comprising multiple thread turns and along which the peripheral edge lacks any notches, wherein the plurality of notches along the initial axial segment includes first notches having a first radial depth and second notches having a second radial depth that is less than the first radial depth;
• wherein an angle defined by sides of the first notches is greater than an angle defined by sides of the second notches.

A wood screw, comprising:

• a head end, a shank and a tapered end, the head end including a tool engaging part, the head end located at a first end of the shank and the tapered end located at a second end of the shank;
• a thread formed along the shank, wherein the thread begins on the tapered end, extends onto the shank and toward the head end;
• and
• wherein the head end includes a neck running from the first end of the shank to a head cap, wherein the head cap includes an underside facing the tapered end and defining an annular ledge, wherein the annular ledge faces the tapered end and lies in a plane that is perpendicular to a central axis of the shank, wherein the underside includes a plurality of serrations extending from the annular ledge, each serration having a leading face and a trailing face that define a cutting edge, wherein the trailing face of each serration tapers away from the tapered end and into the annular ledge such that the serrations are spaced apart from each other by circumferentially extending regions of the annular ledge, wherein the trailing face of each serration tapers toward the annular ledge at an angle, relative to the plane, that is within ±12% of a pitch angle defined by the thread.

A wood screw, comprising:

• a head end, a shank and a tapered end, the head end including a tool engaging part, the head end located at a first end of the shank and the tapered end located at a second end of the shank;
• a thread formed along the shank, wherein the thread begins on the tapered end, extends onto the shank and toward the head end;
• and
• wherein the head end includes a neck running from the first end of the shank to a head cap, wherein the head cap includes an underside facing the tapered end and defining an annular ledge, wherein the annular ledge faces the tapered end and lies in a plane that is perpendicular to a central axis of the shank, wherein the underside includes a plurality of serrations extending from the annular ledge, each serration having a leading face and a trailing face that define a cutting edge, wherein the trailing face of each serration tapers away from the tapered end and into the annular ledge such that the serrations are spaced apart from each other by circumferentially extending regions of the annular ledge;
• wherein the head end further includes a plurality of nibs running from the shank and along the neck toward the serrations, wherein each nib runs substantially parallel to a central axis of the screw and abuts the trailing face of one of the serrations at a location that is closer to the leading face of the serration than to a point where the trailing face meets the annular ledge.