Abstract: The invention relates to a positive locking fastener comprising: a screw (1) having a radial hole (120) at a threaded portion (12); a nut (2) having a tightening portion (21); a cap (3); and a pin (4). The cap has a locking portion (31) intended to cover the threaded portion and a blocking portion (30) intended to engage with a tightening portion of the nut. The blocking portion comprises at least one pair of diametrically opposed openings (32) suitable for allowing a pair of openings to be aligned with the radial hole, in order to allow the pin to be inserted and thus lock the fastening regardless of the relative position of the nut with respect to the screw. The invention also relates to a method for implementing the fastener according to the invention.

Abstract: A resilient cotter pin that has longitudinal central portions that fit in the through hole of a related part. Shoulders connected to longitudinal portions abut the through hole and support curvilinear arms that terminate in an inwardly directed projections that engage a related castellated nut.

Abstract: An apparatus comprises a fastening member, a complimentary fastening member, and a retainer member. The fastening member has a first end, a second end, a channel located at the first end, outer threads located on an outer surface of the fastening member, and inner threads located on an inner surface of the channel. The outer threads of the fastening member are closer to the first end than the second end. The complimentary fastening member has a channel and inner threads located within the channel. The inner threads of the complimentary fastening member are capable of engaging the outer threads of the fastening member. The retainer member has a threaded end. The retainer member is capable of entering the channel of the complimentary fastening member and the threaded end of the retainer member is capable of engaging the inner threads of the fastening member.

Abstract: The present invention provides an improved system (30) for maintaining the position of a castellated nut (34) on a spindle (31) having an axial bore (33) therethrough. The improved system (30) utilizes chordal bore (36) passing through the spindle (31). After the castellated nut (34) is positioned on the spindle (31) a cotter pin (37) is placed within chordal bore (36). The cotter pin (37) is of sufficient length such that both ends (38, 39) thereof extend from the drilled spindle and engage the slots (35) of the castellated nut (34). Thus, the cotter pin (37) prevents rotation of castellated nut (34) maintaining the proper position thereof.

Abstract: Visual inspection of an assembly of a type including nuts and associated locking pins is improved by providing a visually distinctive color difference on the surface of the pin. The invention is particularly useful in assemblies such as air craft where there are a large number of castellated nuts which are located in place on the corresponding bolt by a cotter pin. The presence of the cotter pin can thus be visually determined more easily by its distinctive color from the corresponding castellated nut.

Abstract: The pin type disc brake in which a guide pin is inserted from a boss hole of a second extension arm of a caliper to a boss hole of a first extension arm thereof, the guide pin has a threaded end to which a nut is screwed, a member for preventing the guide pin from moving along the axis of the disc is fitted in a recessed portion formed on the first extension arm of the caliper, and a member for preventing the guide pin from rotating is abutted against a flat surface of an abutment portion formed on the first extension arm of the caliper.