A threaded fastener (10) is having a raised area or bump (16) on a thread flank The flank can be positioned on the nut thread (12) or on the bolt thread (14) The bump (16) forces the mating threads at least on one flank to have near zero tolerances along the pitchline of the threads and thereby eliminating play A threaded repair insert (60) having at least one raised area on a threaded surface (62) also is provided

Low-tolerance threaded fastener

A screw-type fastening device including a male threaded element such as a bolt and a female threaded element such as a nut in which each element contains continuous helical root and crest disposed therein wherein the root and crest include cone-shaped crests and cone-shaped roots at an angle of about 45° to 90°, respectively, external and internal chevron-shaped slots at angles of about 135° to 225°, respectively, and three pairs of parallel load flanks, respectively, for easily releasing the threaded elements without abrasion and protecting them from self-loosening from each other.

Screw-type fastening device

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.

Threaded fastener particularly suited for plastics

A screw threaded member having a thread with at least two portions of different form, one portion being of standard form and the other portion, a locking portion, having its root and crest offset from the standard lead, the offset of the crest being in the same direction as and greater than the offset of the root, the flanks of the locking thread being correspondingly displaced and the flank on the side of the thread which is displaced away from the standard pitch line being bulged outwardly. The root offset may be between one third and two thirds of the offset of the crest. The offsets may be in either direction but are preferably in that direction which moves the lead flank away from the standard pitch line.

Self-locking screw threads

A male threaded fastening member is provided with depressions in at least one or several helix wraps of the thread adjacent the head, the depressions extending inwardly from an edge of the thread at least part way toward a shank of the male fastening member. In a fastening system including the male fastening member, a female member includes projections for engaging the depressions.

Pressure flank screw and fastening system therewith

A prevailing torque fastener including a threaded section having a plurality of thread convolutions and a leading end that makes initial engagement with a mating thread when the fastener is tightened on a mating member. Some of the thread convolutions have a projection formed thereon extending axially of the fastener toward the leading end of the threaded section. The projections progressively increase in size from the leading end of the fastener so that the projections nearer the leading end are smaller than the adjacent projections nearer the other end of the fastener.

Prevailing torque fastener

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Prevailing torque fastener