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.

A device for locking a turnbuckle including a clip having an inner surface. A pair of arms extending from the inner surface, the arms are configured to capture a portion of the turnbuckle. A pin extending from the inner surface, wherein the pin is configured for insertion into the stud of the turnbuckle to resist rotation. Systems and methods are disclosed.

A coupling includes a male adapter and a female adapter, and may include a nut and a sleeve. In embodiments, the male adapter includes a male adapter inner diameter, and may include threads. A method of operating a fluid coupling may include providing a first member, a second member, a nut, and a sleeve, connecting the sleeve with the nut such that rotation of the sleeve causes rotation of the nut, rotating the sleeve to connect the first member with the second member, engaging an inner ratchet profile of the sleeve with a ratchet profile of a shoulder of the first member, and covering the shoulder of the first member, including the ratchet profile, with the sleeve.

A coupling includes a male adapter and a female adapter, and may include a nut and a sleeve. In embodiments, the male adapter includes a male adapter inner diameter, and may include threads. A method of operating a fluid coupling may include providing a first member, a second member, a nut, and a sleeve, connecting the sleeve with the nut such that rotation of the sleeve causes rotation of the nut, rotating the sleeve to connect the first member with the second member, engaging an inner ratchet profile of the sleeve with a ratchet profile of a shoulder of the first member, and covering the shoulder of the first member, including the ratchet profile, with the sleeve.

A combination positive locking and prevailing torque fastener system including a fastener nut, a helical wire insert, a nut cap, and a shaft. The nut cap is longitudinally movable from an engaged position to a disengaged position such that in the engaged position the fastener nut and the nut cap are rotationally locked, and in the disengaged position the nut cap rotates independent of the fastener nut.

A combination positive locking and prevailing torque fastener system including a fastener nut, a helical wire insert, a nut cap, and a shaft. The nut cap is longitudinally movable from an engaged position to a disengaged position such that in the engaged position the fastener nut and the nut cap are rotationally locked, and in the disengaged position the nut cap rotates independent of the fastener nut.

The invention relates to a positive locking fastener comprising: a screw (1) having a cavity (110) at a threaded portion (11); a nut (2) having a tightening portion (21); a first cap (3); a second cap (4); and a pin (5). The first cap is suitable for being inserted into the cavity of the threaded portion. The second cap has a locking portion (402) intended to engage with the first cap and a blocking portion (401) intended to engage with a tightening portion (21) of the nut. The locking portion of said second cap comprises openings (4020) suitable for allowing the pin to be inserted through said openings in order to hold the first cap and the second cap together. The invention also relates to a method for implementing the fastener according to the invention.

The invention relates to a positive locking fastener comprising: a screw (1) having a cavity (110) at a threaded portion (11); a nut (2) having a tightening portion (21); a first cap (3); a second cap (4); and a pin (5). The first cap is suitable for being inserted into the cavity of the threaded portion. The second cap has a locking portion (402) intended to engage with the first cap and a blocking portion (401) intended to engage with a tightening portion (21) of the nut. The locking portion of said second cap comprises openings (4020) suitable for allowing the pin to be inserted through said openings in order to hold the first cap and the second cap together. The invention also relates to a method for implementing the fastener according to the invention.

A bolt and nut assembly with loosening prevention including: a bolt; a nut screw-coupled with a screw thread of the bolt; an anti-loosening cap for receiving the nut therein to prevent the nut from moving in a loosening direction that the nut is released from the bolt; and a nut locking member coupled with the screw thread of the bolt penetrating through the nut, and accommodated in the anti-loosening cap together with the nut. The anti-loosening cap includes: a nut receiving cap for receiving the nut therein; and a bolt receiving cap disposed at an upper portion of the nut receiving cap and having a bolt exposure hole for exposing an end portion of the bolt penetrating through the nut to the outside. The nut locking member includes a coil spring coupled with the screw thread of the bolt, which penetrates through the nut in a predetermined length.

A bolt and nut assembly with loosening prevention including: a bolt; a nut screw-coupled with a screw thread of the bolt; an anti-loosening cap for receiving the nut therein to prevent the nut from moving in a loosening direction that the nut is released from the bolt; and a nut locking member coupled with the screw thread of the bolt penetrating through the nut, and accommodated in the anti-loosening cap together with the nut. The anti-loosening cap includes: a nut receiving cap for receiving the nut therein; and a bolt receiving cap disposed at an upper portion of the nut receiving cap and having a bolt exposure hole for exposing an end portion of the bolt penetrating through the nut to the outside. The nut locking member includes a coil spring coupled with the screw thread of the bolt, which penetrates through the nut in a predetermined length.