Abstract: Aspects of the present disclosure relate to retainer nut locking apparatus and methods for fluid ends, and associated components thereof. In one implementation, a method of operating a fluid end includes installing a retainer nut assembly on a fluid end body by turning a retainer nut in an installation direction and into a bore formed in the fluid end body. The retainer nut has a first surface that faces away from the fluid end body and a second surface that faces that fluid end body. The method also includes rotating a locking tab in a locking direction and into contact with an inner surface of the fluid end body. The locking direction is opposite of the installation direction. The locking tab is disposed inside the bore and adjacent to the second surface of the retainer nut.

Abstract: An axle nut for preloading a bearing is provided. The axle nut may be used to apply and monitor preload on a bearing or bearing assembly. The axle nut includes a cylindrical body having a first end, a second end having a face adapted to bear against a surface, a longitudinal axis, and an outer surface engagable by a tool; a threaded through-hole directed substantially along the longitudinal axis of the cylindrical body; and at least one recess in the face of the second end of the cylindrical body, the at least one recess adapted to expose at least a portion of the surface the face bears against. The first end of the axle may comprise a nut locking mechanism, for example, the nut locking mechanism may include a counter bore having a plurality of internal projections, such as, gear or spline teeth.

Abstract: The specification discloses a locking threaded fastener including a body, a coil spring, and a compression ring. The body is hex-shaped and defines a partially threaded bore, an external circumferential groove, and a passage extending radially between the bore and the groove. The coil spring is located within the bore and includes a first end angularly fixed with respect to the body and a second end extending through the passage and into the groove. The compression ring is located within the groove and defines an opening receiving the second end of the coil spring. The compression ring is free to move within the groove and includes portions that extending radially outwardly beyond the flats of the hex shape. When a conventional wrench is engaged with the hex shape, the wrench compresses the compression ring to prevent relative angular movement between the ring and the body. The “locked” compression ring thereby prevents relative angular movement between the second end of the coil spring and the body.

Abstract: 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.

Abstract: A locking nut includes a threaded main bore for receiving a threaded portion and a number of oblique bores in each of which is positioned a locking pin having a forward end for engagement against the threaded portion. The oblique bore and the associated locking pin have a common longitudinal axis extending at generally the same angle to the axis of the threaded main bore as one of the flanks of the thread of the threaded main bore so that the forward end of the locking nut has at least one flank generally parallel to the longitudinal axis and lying parallel to the portions of the one flank of the threaded main bore adjacent the inner end of the oblique bore. Each locking nut is generally cylindrical and possesses an outer surface that is grooved or serrated to facilitate insertion of the locking nut into the respective oblique bore.

Abstract: The present invention has been accomplished to provide an earth nut which has an excellent grounding performance, and which is free from the possibility of losing a grounding function even upon application of a high axial force and is low in cost, said earth nut comprises a flanged nut having a flange, which is formed at a lower end of a nut body to be integral with the nut body, a plurality of projections formed at a lower portion of the flange near an outer peripheral edge of the flange for cutting and peeling off a coating film on a seat surface, with which a bottom surface of the nut contacts, and a plurality of longitudinal grooves provided on screw threads of a female thread portion of the nut body to extend axially of the nut body and having edges on one sides of lines of intersection of the screw threads of the female thread portion of the nut and the longitudinal grooves to peel off a coating film adhered to screw threads of a bolt, onto which the nut are screwed.

Abstract: A mechanism is disclosed which can be used to selectively establish the amount of resistance to un-screwing associated with common fittings, especially those with high pitch-angle threads. Such a mechanism is useful in a variety of applications, including tamper-evident mechanical assemblies, child-proof medicine bottles and fittings under substantial axial loads.

Abstract: The present locking mechanism for rotatable fastener functions to reliably and inexpensively secure a rotatable fastener in place once it is seated. This is accomplished by the formation of an aperture into the body of the rotatable fastener in a lengthwise direction coaxial with the axis of the cylindrical shaped rotatable fastener. A second aperture is formed in the body of the rotatable fastener perpendicular to the first aperture and intersecting same. A locking pin is placed in the second aperture such that one end of the locking pin is flush with the surface of the body of the rotatable fastener, non-interfering with the operation of the threads formed on the exterior surface of the body of the rotatable fastener. A second end of the locking pin protrudes into the first aperture. A locking post is placed in the first aperture, located above the locking pin and accessible via the open end of the first aperture in the head of the rotatable fastener.

Abstract: A bolt is provided with a radial, spring-loaded pawl, and an associated nut is provided with cooperating detents on its inner diameter that cooperate with the pawl so that the nut does not back off the bolt. The nut is also castellated for insertion of a cotter pin through the bolt so that the nut is further restrained from backing off. In the event that the nut backs off, the pawl prevents the bolt from pulling out of a close tolerance hole, such as a rod end fitting.

Abstract: An encapsulated metal bolt comprises a head portion having an encapsulating cap thereon with a plurality of conductive fibers therein electrically isolated from the head but electrically exposed to the surface of a complementary aperture.