A male anti-cross threading fastener comprising: a substantially round shank having a lead end, a torque end, and a plurality of male threads around a circumference of the shank, the plurality of male threads comprising: a standard thread around at least a portion of the circumference of the shank and having a standard thread contour, wherein a width and a thread angle of the standard thread enables engagement with corresponding female threads, wherein the major diameter of the standard thread is between a lower major diameter limit and a higher major diameter limit; a transitional thread around at least a portion of the circumference of the shank and having a transitional thread contour with a width and a thread angle similar to the width and thread angle of the standard thread that enables engagement with corresponding female threads; an anti-cross thread around at least a portion of the circumference of the shank and having an anti-cross thread contour and an outside diameter configured to promote alignment of the male anti-cross thread fastener with a female fastener; and a lead thread around at least a portion of the circumference of the shank and having a lead thread contour, and wherein the transitional thread contour has a height that transitions from the lower major diameter limit of the standard thread to the outside diameter of the anti-cross thread.

Disclosed is a dumbbell-shaped asymmetric bidirectional tapered thread connection pair having lager left taper and a small right taper. The internal thread (6) of the thread connection pair (10) is a bidirectional taper hole (41) on the inner surface of a cylindrical base body (2) and external thread (9) is a bidirectional truncated cone body (71) on the outer surface of a columnar base body (3). Complete unit body threads are both helical, dumbbell-shaped (94), special bidirectional cone bodies each having a lager left taper (95) than right taper (96) and being small in the middle and large at both ends. The performance mainly depends on the conical surfaces and the tapers of the threaded bodies matching with each other.

The disclosure belongs to the technical field of general technology of devices, and relates to an olive-shaped asymmetric bidirectional tapered thread connection pair having a large left taper and a small right taper, solving the problems of poor self-positioning and self-locking properties of the existing thread. An internal thread (6) is a bidirectional tapered hole (41) (non-entity space) on the inner surface of the cylindrical body (2), an external thread (9) is a bidirectional truncated cone body (71) (material entity), the complete unit threads are both helical olive-like (93) shaped special bidirectional tapered bodies which have a left taper (95) being a right taper (96) and is large in the middle and small in two ends.

A bone screw system includes a bone screw having a tulip that forms a seat for a longitudinal support for surgical connection of adjacent bone screws. The tulip has a tulip thread into which a clamping screw is screwed. The clamping screw has a clamping screw thread for locking the longitudinal support by clamping within the seat. The clamping screw thread is provided on the run-in side with a thread chamfer. The thread chamfer is introduced to the clamping screw thread while chamfering a thread elevation in the radial direction.

The disclosure belongs to the technical field of general technology of devices, and relates to an olive-like shaped asymmetric bidirectional tapered thread connection pair, solving the problem of poor self-positioning and self-locking performances of the thread. The internal thread (6) is a bidirectional tapered hole (41) (non-entity space) on the inner surface of the cylindrical body (2), the external thread (9) is a helical bidirectional truncated cone body (71) (material entity) on the outer surface of the columnar body (3), the complete unit thread includes an olive-like (93) shaped bidirectional tapered body which has a left taper (95) being larger than and/or smaller than a right taper (96) and is large in the middle and small in two ends.

The disclosure belongs to the technical field of general technology of devices, and relates to a dumbbell-like shaped asymmetric bidirectional tapered thread connection pair, solving the problems of self-positioning and self-locking performances of the threads. An internal thread (6) is a bidirectional tapered hole (41) (non-entity space) on the inner surface of a cylindrical body (2), and an external thread (9) is bidirectional truncated cone body (71) (material entity) on the outer surface of a columnar body (3). A complete unit thread comprises a helical dumbbell-shaped (94) bidirectional tapered body having the left taper (95) greater than or smaller than the right taper (96) and being small in the middle and large in two ends.

The present invention belongs to the field of general technology of device, and relates to an olive-shaped asymmetric bidirectional tapered thread connection pair with smaller left taper and greater right taper, which solves the problems of poor self-positioning and self-locking performance of existing threads, wherein an internal thread (6) is a bidirectional tapered hole (41) (non-entity space) on an inner surface of a cylindrical body (2); an external thread (9) is a bidirectional truncated cone body (71) (material entity) on an outer surface of a columnar body (3), and a complete unit thread is a helical special bidirectional tapered body in an olive-like shape (93) with a left taper (95) smaller than a right taper (96) and with a large middle and two small ends.

The disclosure relates to the general technology of equipment, and in particular relates to a connection pair of threads outlining asymmetrically and bidirectional tapered dumbbell-like shape having smaller-end conical degree. The disclosure solves the problems of poor self-positioning and poor self-locking of existing threads, etc. The disclosure is characterized that an internal thread (6) on the inner surface of a cylindrical body (2) outlines a bidirectionally tapered hole (41) (non-solid space) and an external thread (9) on the outer surface of a columnar body (3) outlines a bidirectionally truncated cone body (71) (material entity) and each complete thread body unit forms a special bidirectionally tapered body in a helical dumbbell-like shape (94) having a small middle part and two large ends, the left taper being smaller than the right taper (96).

The present invention belongs to the field of general technology of device, and particularly relates a connection structure of a bolt and a nut of an asymmetric bidirectional tapered thread in an olive-like shape, which solves the problems such as poor self-positioning and self-locking performance of the existing screw thread. The connection structure is characterized in that an external thread (9) is a bidirectional tapered hole (41) (non-entity space) in an internal surface of a cylindrical body (2); an external thread (9) is a bidirectional truncated cone body (71) (material entity) on an external surface of a columnar body (3); and a complete unit thread is a helical bidirectional tapered body in an olive-like shape (93) in which a left taper (95) is greater than and/or less than a right taper (96).

The present invention belongs to the technical field of device access, and relates to a bolt and nut connection structure of an olive-shape bidirectional tapered thread with smaller left taper and greater right taper, which solves the problems of poor self-positioning and self-locking performance of existing threads, wherein an internal thread (6) is a bidirectional tapered hole (41) (non-entity space) on an inner surface of a cylindrical body (2); an external thread (9) is a bidirectional truncated cone body (71) (material entity) on an outer surface of a columnar body (3), and a complete unit thread is a bidirectional tapered body in an olive-like shape (93) with a left taper (95) smaller than a right taper (96) and with a large middle and two small ends.