A device for removing wall plugs from the walls. The device has 2 main elements, a double-headed screw and a hub, which together are manually operated to remove the wall plugs from the walls easily and without damage to the surfaces. The set of the screw for removing wall plugs and the hub is called the device for removing wall plugs. The device for removing wall plugs is made up of 2 elements: a screw for removing wall plugs and an extractor hub. These 2 elements are coupled so that the device for removing wall plugs works properly. The screw for removing wall plugs is a longitudinal element with double head. It features a screw rope, a manual turning head and an electric turning head.

A screw nail includes a nail shaft portion extending along one direction, and a head portion whose diameter is enlarged along other direction orthogonal to an extension direction. A sharp tip end portion is formed on one end side of the nail shaft portion, and the head portion is formed at an end portion on the other end side. The nail shaft portion is formed with a screw thread, and the head portion is formed with an engaging portion capable of engaging with a rotary tool. A convex portion protruding along an axis direction of the nail shaft portion is formed on an end surface of the head portion. A concave portion that is concave with respect to the convex portion is formed between the convex portion and the engaging portion. A virtual plane specified by vertexes of the convex portion is a plane orthogonal to the axis direction.

A T-Nut comprising a tubular body attached to a flanged head is provided. The tubular body includes a bottom portion of constant diameter and an upper neck portion with a neck diameter that gradually increases as it approaches the flange head. Additionally, the bottom surface of flange head of the T-Nut may be recessed inwardly towards the top surface of the flange head to create circumferential concave cavity underneath the flange head, which will allow the flange head to envelope any portions of a washer or casing that may be above the surface of the material being joined.

Various embodiments provide a post-to-beam fastener including a head, a tip, and a threaded shank connected to the head at a first end and the tip and a second end. In various embodiments, threaded shank includes a longitudinal axis extending from the head to the tip, and the tip includes a recess operable to removably receive a drill bit to the fastener.

A fastener includes a screw structure having threads and a dowel structure. The dowel structure includes a shank extending from the screw structure in an axial direction and connected to the screw structure, and a head engaged to the shank portion and disposed distally from the screw structure. A length of the dowel structure is greater than or equal to a length of the screw structure.

An assembly for a turbomachine turbine includes at least one ring sector made of CMC material and a support casing including an upstream flange and a downstream flange between which each ring sector is disposed, each ring sector including a base that has a radially external face from which radially extend two lugs, the lugs of each ring sector being retained between the two flanges of the support casing by axial pins each engaged in one of the flanges of the ring support casing and in the lug of the ring sector facing said flange, the assembly further including, for each ring sector, at least one radial retaining pin screwed into the support casing and coming to radially bear against a lug of the at least one ring sector to retain it in position, and anti-rotation system for rotationally locking the radial retaining pin.

A fastening screw and a height-adjustable table using the same are provided. A threadless transition portion is provided between a threaded section and a head portion of the fastening screw to increase the contact area between the screw and a workpiece, and to cooperate with a shaft portion to fasten the workpiece. The transition portion is provided with a tapered wall surface, and the transition portion expands from the threaded section to the head portion of the screw. The screw offers a tension expanding outward in a circumferential direction of a mounting portion. An area of a joint between the transition portion and the head portion does not exceed a circumferential area of threads. In a direction of a central axis of the screw, the projection of the transition portion overlaps that of the shaft portion, which prevents the transition portion from falling off the workpiece or damaging the workpiece.

A hose adapter may include an outer tube, an inner tube, a hose connector, and a hose. An inner peripheral ring protrudes from the inner periphery of the outer tube while an expanding ring portion protrudes from the outer periphery of an end of the inner tube. The outer periphery of the inner tube further has a first peripheral recess, a second peripheral recess, and a first outer thread, and a first O-ring and a second O-ring are respectively disposed on the first peripheral recess and the second peripheral recess. The inner tube is inserted into the outer tube, and the expanding ring portion is abutted against the inner peripheral ring, and the first O-ring is coupled between the outer tube and the inner tube while the second O-ring and the first outer thread are adapted to pass through and be exposed out of the outer tube.

A self-penetrating thread forming and flow drilling fastener for thick materials with a generally cylindrical partially threaded shank, a drive system at the first end of the shank and a flow drilling tip at the second end of the shank. The flow drilling tip is sized larger than the minor diameter of the threaded shank but less than the major diameter to control installation torque enabling installation into thick materials with greatly reduced risk of torsional failure resultant from a decrease in torque. The flow drilling tip and threads may be a variety of shapes or thread types based on the substrate material the fastener is installed into.

A screw having stacked screw heads includes a screw shank portion with a thread and a screw head portion rigidly connected to each other. The screw head portion is driven to bring the screw shank portion to rotate. The screw head portion includes a first screw head and a second screw head. The first screw head has a first shaped groove on its top plane to receive an operating torque. A neck portion is connected to a bottom plane of the first screw head and a top plane of the second screw head. The second screw head has a second shaped groove on its top plane. The neck portion or the connection between the neck portion and the first screw head or the second screw head has lower torsional endurance than each of the first screw head and the second screw head.