A fixing device having at least two threaded rings (10, 12), which between them hold a membrane (14), which is an integral part of this pair of rings (10, 12) and which is kept at a distance from the rings (10, 12) by introduced slots (16, 18, 24, 26), rectilinear in a unmounted state, which all open to the outside into the environment, and by resting against only partially annularly extending webs (20, 22), and having at least one clamping bolt (30), which can be used to adjust the axial distance between the rings, characterized in that at least one clamping bolt (30) passes through the membrane (14) between two adjacent webs (20, 22), that in the unmounted state the membrane is oriented in an undeformed manner in parallel to the rings (10, 12) and in a mounted state it is moved between the webs (20, 22) in a deformed state in the direction of at least one of the rings to at least partially form a slanted or arc course, as soon as the distance (a) between a pair (10, 12) of rings (10, 12) is reduced by means of the relevant assignable clamping bolt, and in that the at least one clamping bolt (30) passing through the membrane (14) passes through adjacent slots (16, 18, 24, 26), which are separated from the membrane (14).

A fixing device having at least two threaded rings (10, 12), which between them hold a membrane (14), which is an integral part of this pair of rings (10, 12) and which is kept at a distance from the rings (10, 12) by introduced slots (16, 18, 24, 26), rectilinear in a unmounted state, which all open to the outside into the environment, and by resting against only partially annularly extending webs (20, 22), and having at least one clamping bolt (30), which can be used to adjust the axial distance between the rings, characterized in that at least one clamping bolt (30) passes through the membrane (14) between two adjacent webs (20, 22), that in the unmounted state the membrane is oriented in an undeformed manner in parallel to the rings (10, 12) and in a mounted state it is moved between the webs (20, 22) in a deformed state in the direction of at least one of the rings to at least partially form a slanted or arc course, as soon as the distance (a) between a pair (10, 12) of rings (10, 12) is reduced by means of the relevant assignable clamping bolt, and in that the at least one clamping bolt (30) passing through the membrane (14) passes through adjacent slots (16, 18, 24, 26), which are separated from the membrane (14).

A self-locking plug assembly includes ratchet ring circumscribing body having centerline and shank having a threaded top portion. Flexible fingers spiral away from periphery of ratchet ring to engage polygonal sides of polygonal sided ring attached to body. Hooks may extend radially outwardly and downwardly from periphery of ratchet ring. Spring around polygonal portion of body rests on ratchet ring. Annular retaining ring snapped into annular groove in body compresses spring. Hooks may engage notches in the upper wall. Alternatively, hooks may include paws extending inwardly from downwardly extending legs of hooks and into the pockets and engaging upper pocket walls to axially secure the ratchet ring. Body may be borescope plug with a lower end of shank conforming to lower port opening in upper wall. Alternatively, flexible fingers extend outwardly from radially outer rim of ratchet ring and engage polygonal sides of inner side of polygonal sided ring circumscribing ratchet ring.

A self-locking plug assembly includes ratchet ring circumscribing body having centerline and shank having a threaded top portion. Flexible fingers spiral away from periphery of ratchet ring to engage polygonal sides of polygonal sided ring attached to body. Hooks may extend radially outwardly and downwardly from periphery of ratchet ring. Spring around polygonal portion of body rests on ratchet ring. Annular retaining ring snapped into annular groove in body compresses spring. Hooks may engage notches in the upper wall. Alternatively, hooks may include paws extending inwardly from downwardly extending legs of hooks and into the pockets and engaging upper pocket walls to axially secure the ratchet ring. Body may be borescope plug with a lower end of shank conforming to lower port opening in upper wall. Alternatively, flexible fingers extend outwardly from radially outer rim of ratchet ring and engage polygonal sides of inner side of polygonal sided ring circumscribing ratchet ring.

A nut, in particular a union nut for a line connection, extends along a longitudinal direction, wherein the nut has at least one expansion region. The expansion region has circumferentially one or more recesses which extend transversely and/or obliquely to the longitudinal direction.

Provided is a nut that resists being loosened and is easy to be tightened. A nut 600 includes a nut main body 10 having a tapped hole 30 formed therein; an annular member 41 formed on the side of a top surface of the nut main body 10; and an outer frame member 45 formed on the side of an outer edge of the annular member 41. The annular member 41 includes a second end portion 42b in contact with a top surface 11 of the nut main body 10 and a first end portion 42a located opposite to the second end portion 42b. A top surface of the first end portion 42a is located above a top surface of the second end portion 42b. A first gap 40 is formed between the first end portion 42a and the top surface 11 of the nut main body 10. A second gap 49 is formed between a side surface of the annular member 41 and an inner wall 47 of the outer frame member 45. The top surface of the first end portion 42a of the annular member 41 is located above a top surface 46 of the outer frame member 45. The inner wall 47 of the outer frame member 45 is inclining while tapering in an upward direction.

A self-locking insert includes an insert body having an outer surface. Also included is a bore extending through the insert body, the bore defining an inner surface and configured to receive a lead screw. Further included is a self-locking feature configured to engage a holder to retain the self-locking insert in a predetermined position, the self-locking feature comprising at least one lug configured to be compressed by the holder during installation of the self-locking insert in the holder, the self-locking insert configured to be pressed into position in the holder. Yet further included is a de-lashing feature configured to interference fittingly engage the holder.

A self-locking insert includes an insert body having an outer surface. Also included is a bore extending through the insert body, the bore defining an inner surface and configured to receive a lead screw. Further included is a self-locking feature configured to engage a holder to retain the self-locking insert in a predetermined position, the self-locking feature comprising at least one lug configured to be compressed by the holder during installation of the self-locking insert in the holder, the self-locking insert configured to be pressed into position in the holder. Yet further included is a de-lashing feature configured to interference fittingly engage the holder.

A self-locking nut includes a main-nut body and a deformable-nut body. The main-nut body has a recess leading into an interior threaded bore forming x turns of an internal thread therein. The deformable-nut body has an outer flange and an interior threaded bore forming y turns of an internal thread therein. The outer flange of the deformable-nut body is fixed to the main-nut body such that a relief space is formed between the deformable-nut body and the recess. A ratio of x:y is about 2:1.

A self-locking nut includes a main-nut body and a deformable-nut body. The main-nut body has a recess leading into an interior threaded bore forming x turns of an internal thread therein. The deformable-nut body has an outer flange and an interior threaded bore forming y turns of an internal thread therein. The outer flange of the deformable-nut body is fixed to the main-nut body such that a relief space is formed between the deformable-nut body and the recess. A ratio of x:y is about 2:1.