A fastener is provided, including: a driven end including an engaging hole which includes three slots recessed radially and angularly arranged in intervals, each of the three slots being formed as a part of a rectangle and including two right angles, every adjacent two of the three slots defining a rib therebetween.

A fastening device for fastening a bolt to a fastening target object, wherein the bolt has a bolt head female screw section in an inner circumferential surface of a recess provided in an upper surface of a bolt head section. The fastening device includes a tension rod having a rod male screw section engaging the bolt head female screw section; a drive socket circumferentially surrounding the tension rod and having a lower end section with a grasper for laterally grasping the bolt head section; a supporter circumferentially surrounding the drive socket and having a lower end section protruding downward beyond a lower end section of the drive socket; a sensor for sensing compression force acting on the supporter in the upward/downward direction; a first motor for rotating the tension rod around an axis extending in the upward/downward direction; and a second motor for rotating the drive socket around the axis.

A bone anchoring screw comprises a head, a shaft and a threaded portion arranged successively along a common axis, the head having a recess comprising at least two stages arranged in succession along the common axis, the first stage having a diameter larger than the diameter of the second stage, in which one of the two stages comprises at least one socket of a first type and the other of the two stages comprises at least one socket of the first type and one other type.

A segmented nut is formed by three segments held together with a surmounting sleeve. Rotation of the sleeve in the order of 60° frees the segments, allowing for quick release of the nut.

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.

Methods and apparatus for a fastener head having a dual zone socket area and a mating driver bit according to aspects of the present technology include a fastener configured with driving surfaces adapted to provide enhanced engagement between each other during use. The fastener includes a recessed socket area with a sidewall that has an upper inwardly tapering section and a lower vertical section that extends to the bottom of the recessed socket area. The upper inwardly tapering section of the sidewall may also include an offset relative to the lower vertical section to create asymmetrical driving and removal surfaces. The technology also includes a corresponding mating driver bit configured with mating surfaces to the fastener to provide enhanced engagement between the fastener and mating driver bit. The technology also allows either the fastener or the driving bit to be used with preexisting fasteners and driver bits.

A self-drilling screw (10) having a head (20), a shaft (30) at least partially wearing a thread (35) and a drill point (40). The base material of the screw (10) including the drill point (40) is integrally manufactured from an austenitic 300 series steel with a surface hardness (uncoated) of 400-600 HV 0.3. The surface of the screw has a top coating of Zn—Ni with a Ni-content between 12-15% deposited on the austenitic base material. This self-drilling screw (10) is manufactured from a blank of raw austenite 300 series steel which is initially squeezed by cold forming to reduce its diameter in a first operation and, in following cold forming operations the head, the drill point and a thread are formed.

A low mass fastener head that reduces the amount of material required in manufacturing. The fastener comprises a threaded shank having a longitudinal axis; a head attached to one end of the threaded shank, the head comprising: full-height lugs and short-height lugs positioned at approximately 0, 60, 120, 180, 240, or 300 degrees around the longitudinal axis of the threaded shank, wherein the short-height lugs are shorter than the full-height lugs. Those portions of a hex head that are not necessary for application and transmission of torque, nor necessary to resist axial loading, nor necessary to axially stabilize the fastener head within conventional driving tooling may be removed. Compatibility with existing hex head tools is maintained while improving handling of the fastener by an assembler and reducing material used in the fastener head.

A fastening system is configured to be securely fastened from one side of at least one component. The fastening system includes a fastener including a shaft having a distal end extending from a head. A first channel is formed through the fastener between the head and the distal end. A nut is configured to be connected to the fastener. The nut includes a second channel that is coaxially aligned with the first channel.

The invention relates to a screw and corresponding screw driver for driving the screw into a dental implant at an angle from the longitudinal axis of the implant. The screw has a polygonal interface and the screw driver has a matching interface for driving the screw to rotate.