A centering screw for aligning two elements, particularly a workpiece and a carrier, relative to each other, the centering screw having a first end section with a first outside diameter and a first length, and a second end section with a second outside diameter and a second length, the first end section having a first thread, at least in sections, and a cone being provided for the centering. In this case, the centering screw has the cone in an intermediate section between the first end section and the second end section, the cone having a diameter changing along the intermediate section, the diameter at an end of the cone facing away from the first end section being larger than the first outside diameter, and the end of the cone facing away from the first end section being assigned an axial stop facing away from the first end section.

A threaded fastening assembly composed of a bolt, a nut, a fixing pin, and a positioning piece is revealed. The bolt includes at least one first groove arranged axially on a cylindrical surface of a shank and at least one first threaded segment. The nut has at least one second groove disposed axially on an inner cylindrical surface thereof and at least one second threaded segment. The first and second grooves are aligned to form a locking space for mounting the fixing pin. The positioning piece has a first side with two ends connected to a second side and a third side correspondingly. Inner edges of the second side and the third side are facing and extending toward each other to form convex portions which are matched with the first grooves. The fixing pin is mounted in the locking space for fastening the bolt and the nut.

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.

The invention relates to a securing means for a screw having an annular sleeve for insertion in a through-hole in a workpiece, characterized in that the annular sleeve is provided with at least one plate-like resilient tongue which extends from the annular sleeve and which projects in the direction toward a longitudinal center axis of the sleeve.

Embodiments of systems and methods are disclosed to detect tampering and/or provide cryptographic evidence of tampering. Tampering is detected and tamper evidence is provided by incorporating at least one tamper-evident assembly and at least one processing device within an enclosure housing a host device. The tamper-evident assembly includes one or more tamper-evident fasteners, each having an identification chip, which stores a unique identifier corresponding to the tamper-evident fastener and transmits the unique identifier through the tamper-evident fastener to the at least one processing device when the tamper-evident fastener is coupled to a surface of the enclosure to secure a point of entry on the enclosure. The processing device may detect tampering and/or provide cryptographic evidence of tampering when a hash of the unique identifier(s) detected when the host device is in use does not match a hash of the unique identifier(s) detected before the host device is used.

An ignition-suppressing device (100) for shielding fasteners (106) comprises a ribbon (102) and receptacles (104) that are spaced apart from one another along the ribbon (102).

A captive screw, comprising: a screw; a press fit nut, to connect to an opening on a device and to accept a screw, including: a bottom portion, to extend through the opening; a top portion; and a middle portion, wherein the middle portion is smaller in circumference than the top portion and the bottom portion; and a sleeve including a protrusion, wherein the sleeve fits over the screw and attaches to the press fit nut via the protrusion.

A vehicle-body structure of a vehicle of the present invention comprises a bumper support portion provided at a vehicle body of the vehicle to support to bumper, a connection portion connecting the bumper and the bumper support portion and supporting the bumper, and a slide allowance portion configured to allow the bumper to slide in a vehicle longitudinal direction relative to the bumper support portion when a longitudinal load having a specified magnitude or larger is applied to the bumper from a vehicle outside, wherein the connection portion is provided on an upper face of the bumper support portion, and the slide allowance portion is configured to allow the longitudinal sliding of the bumper independently from the supporting of the bumper by the connection portion.

Captive fastener systems and structural assemblies having captive fastener systems are described. The captive fastener systems include a captive fastener assembly having a sleeve and a captive fastener arranged within the sleeve, a mounting assembly having a bushing and a mounting fastener arranged to pass through the bushing, and a joining body having a mounting aperture, wherein the sleeve is attached to the joining body and the bushing and the mounting fastener are configured to pass through the mounting aperture. The mounting assembly is configured to provide a first degree of movement of the captive fastener system and the captive fastener assembly is configured to provide a second degree of movement of the captive fastener system.

A fastener cap system can include a rigid cap and a sealing member which forms a liquid barrier so moisture is impaired from entering a space under the rigid cap and/or around a fastener installed through it. The sealing member can include a central seal disposed on an upper surface of the cap, the seal extending beyond a head of a fastener, which extends through the cap and sealing member, so that moisture is impaired from entering the cap under the head. The sealing member can be above and below respective lowermost and uppermost cap surfaces so the cap system can be fed cleanly and efficiently through a cap feeder during installation via a tool. The sealing member, which can have a higher coefficient of friction than the rigid cap, thereby does not drag along a cap feeder and cause feeding issues. Related methods of manufacture and use are provided.