Abstract: A self-tapping screw includes a head, a shaft, a tapered end and a rounded distal tip. A thread includes a thread start on the tapered end. The axial position of the thread start and a first full thread, the radius of the round distal tip and the diameter of the tapered end at the thread start are controlled in relation to the screw size for consistent, improved screw performance.

Abstract: A self-tapping screw includes a head, a shaft, a tapered end and a rounded distal tip. A thread includes a thread start on the tapered end. The axial position of the thread start and a first full thread, the radius of the round distal tip and the diameter of the tapered end at the thread start are controlled in relation to the screw size for consistent, improved screw performance.

Abstract: A threaded fastener includes a curved-line path thread provided in a helical pattern along a shank of the fastener. The curved-line path can be provided on either side of the standard straight-line path or on opposite sides of the straight-line path. The curved-line path and can be provided on all or a portion of the thread from near the tip end thereof to near the head end thereof.

Abstract: A male threaded fastener particularly suited for use in plastics has a high thread and a low thread. Depressions are provided in the pressure flank of the high thread. Dimensional relationships are defined for scaling the fastener to commonly accepted sizes.

Abstract: A male threaded fastener particularly suited for use in plastics has a high thread and a low thread. Depressions are provided in the pressure flank of the high thread. Dimensional relationships are defined for scaling the fastener to commonly accepted sizes.

Abstract: A self-tapping screw includes a head, a shaft, a tapered end and a rounded distal tip. A thread includes a thread start on the tapered end. The axial position of the thread start and a first full thread, the radius of the round distal tip and the diameter of the tapered end at the thread start are controlled in relation to the screw size for consistent, improved screw performance.

Abstract: In a fastener having a head, which may have having torque-absorbing ribs, and a shank, which is unitary with the head and which has a primary thread formation and a secondary thread formation. The primary thread formation, which defines axially spaced threads along a generally cylindrical portion of the shank and along a tapered tip of the shank, has a generally uniform radial dimension along the generally cylindrical portion of the shank. The secondary thread formation, which defines axially spaced threads between some of the threads defined by the primary thread formation, originates at a region spaced axially from the distal end of the generally cylindrical portion of the shank, terminates at the head, and tapers outwardly from the region where it originates toward the head. The secondary thread formation at the region adjoining the head has a radial dimension less than the generally uniform radial dimension of the primary thread formation along the generally cylindrical portion of the shank.

Abstract: A faying plate having a clearance hole is fastened to a tapping plate having a tapping hole by a fastener having a shank with a tapered tip and with a self-tapping thread. The shank, which defines an axis, is adapted to tap a complementary thread around the tapping hole, via the self-tapping thread, when the fastener is driven rotatably. The fastener has a unitary head with a bearing portion having a peripheral edge and a having surface facing the shank, flaring outwardly toward the shank, and frusto-conical at a conical angle of about 5.degree. relative to a plane perpendicular to the axis. Eight torque-absorbing ribs project from the clamping surface, are spaced at regular intervals about the axis, and have ridges that lie on an imaginary, frusto-conical surface flaring outwardly toward the shank at a conical angle of about 1.degree. relative to a plane perpendicular to the axis and at a conical angle of about 4.degree. relative to the clamping surface. Each rib has a depth from not less than 0.