A self-piercing rivet element is provided with a body part having a thread cylinder and with a hollow rivet section to be pressed into an as yet unpierced component. In this arrangement, the rivet section is designed to be at least regionally dilatable by means of a die button and tapers in the direction of the central longitudinal axis and away from the body part. The hollow rivet section has, in the region of the transition to the body part, a diameter, which is larger than the outer diameter of the thread cylinder. Furthermore, the rivet section has a closed peripheral wall and an opening at its free end which corresponds at least substantially in diameter to the core diameter of the thread cylinder. Furthermore a component assembly, a method for the manufacture of the component assembly and the die button are claimed.

A fastening assembly includes: a panel defining an aperture; a fastener having a cap and a shaft extending from the cap, the shaft being disposed through the aperture, the fastener having a first corrosion rate, and the fastener including: a recess formed in the cap and extending at least partially around the shaft; face surfaces that are planar and that are to directly contact the panel; and recessed channels that are disposed between the face surfaces, respectively, that are recessed relative to the face surfaces, and that extend from a radially outer edge of the cap to the recess; and an anode insert disposed in the recess and having a second corrosion rate that is faster than the first corrosion rate.

A different-material fastener fastens together a first member and a second member formed from a material different from a material of the first member. The different-material fastener includes a rivet and a stud. The rivet includes a shank configured to be pressed into the first member, and a first head disposed at one end of the shank. The first head has a diameter larger than a diameter of the shank. The stud includes a shaft protruding from a center of an upper surface of the first head, and a second head that is disposed at an end of the shaft. The second head has a diameter larger than a diameter of the shaft and smaller than the diameter of the first head.

The present invention relates to a self-punching functional element that is adapted for punching into a workpiece, in particular into a sheet metal part. It comprises a head part forming a flange and having a contact surface for contact with the workpiece; and a punching section that extends away from the head part, in particular from the contact surface, and that is in particular arranged coaxially to a central longitudinal axis of the functional element. The punching section has a peripheral punching edge at its free end for punching through the workpiece and surrounds a cavity in a peripheral direction, said cavity having an opening defined by the punching edge. An inner wall of the punching section facing the cavity has at least one elevated slug securing portion projecting radially inwardly into the cavity, in particular wherein the elevated portion has the form of a rib extending in an axial direction.

A system includes a computing system, a snap rivet, and a printed circuit board assembly (PCBA). The computing system includes a chassis. The snap rivet includes a rivet and a cap, and the cap is secured to the chassis. The PCBA includes a pin base. The pin base has a washer portion with a hole. The pin base is configured to receive the cap through the hole. The cap protrudes through the hole and mechanically engages the rivet to secure the PCBA to the chassis. The snap rivet provides for tool-less installation and removal of the PCBA from the chassis of the computing system.

A system includes a computing system, a snap rivet, and a printed circuit board assembly (PCBA). The computing system includes a chassis. The snap rivet includes a rivet and a cap, and the cap is secured to the chassis. The PCBA includes a pin base. The pin base has a washer portion with a hole. The pin base is configured to receive the cap through the hole. The cap protrudes through the hole and mechanically engages the rivet to secure the PCBA to the chassis. The snap rivet provides for tool-less installation and removal of the PCBA from the chassis of the computing system.

A semi-hollow punch rivet by which a joint is establishable. The rivet includes: a rivet head having a rivet shaft, which comprises a lateral surface, a rivet foot having a foot front surface is provided at an end of the rivet shaft facing away from the rivet head, the foot front surface is perpendicular to a longitudinal axis L.sub.A of the rivet shaft, and a bell-like shaft cavity extends into the rivet shaft beginning at the end facing away from the head. The shaft cavity is formed by: an inlet portion beginning at a radial inner side of the foot front surface and extending arc-shaped with an inlet radius R.sub.S in the direction of the rivet head, a linearly extending continuation portion into which the inlet portion transitions tangentially and which is arranged in an acute angle with respect to the lateral surface, and a final dome portion.

A hollow punch rivet is described having a flange and a rivet section. Furthermore, a method for the attachment of individual components to one another using a punch rivet is described, with at least one of the components being formed by a material of the composite material. The method includes the following steps: a) arrangement of the die button against one of the two components to be secured to one another, which are placed on one another, wherein the die button has a bore which is dimensioned to receive the rivet section, b) carrying out a relative movement of the punch rivet with the free end of the rivet section to the fore towards the components arranged on one another and in the direction of the die button, c) piercing of the components with the free end of the rivet section and introduction of the rivet section into the bore of the die button until the component contact surface comes into contact and the component adjacent to the flange, d) using a plunger in order to dilate the punch rivet at least locally and e) forming a rivet bead by reshaping the free end region of the rivet section.

A piston and piston rod assembly includes a piston rod having a first portion and a smaller second portion extending from the first portion. The second portion has a circumferential groove that receives at least one sealing ring or O-ring located between the first portion and the free end of the second portion. A piston has an aperture extending between two ends, with the top open end having a larger diameter than the bottom open end. The second portion of the piston rod is inserted through the aperture of the piston so that the free end of the second portion emerges through the top open end of the piston and compresses the at least one sealing ring or O-ring with the inner surface of the piston. The free end of the second portion of the piston rod is cold-worked to overlie at least a portion of the top open end of the piston.

A piston and piston rod assembly includes a piston rod having a first portion and a smaller second portion extending from the first portion. The second portion has a circumferential groove that receives at least one sealing ring or O-ring located between the first portion and the free end of the second portion. A piston has an aperture extending between two ends, with the top open end having a larger diameter than the bottom open end. The second portion of the piston rod is inserted through the aperture of the piston so that the free end of the second portion emerges through the top open end of the piston and compresses the at least one sealing ring or O-ring with the inner surface of the piston. The free end of the second portion of the piston rod is cold-worked to overlie at least a portion of the top open end of the piston.