A compound screw is a two-piece assembly where the head of the screw can rotate in the tightening direction to a designed tightening torque to drive the screw while being able to positively counter-rotate in the loosening direction. The screw assembly comprises a screw and a cap surrounding the head of the screw. The screw has a head at the top and a threaded shank downwardly extending from a base of the screw head. The screw is turned by turning the cap about a central axis of the screw. The cap is rotatably affixed to the screw head by a loose riveting of the cap to the top most end of the screw head by flaring a thin-walled upwardly extending portion thereof. The cap includes a plurality of axially extending peripheral resilient arms which engage peripheral cam surfaces around the outside of the screw head.

A threading indicating bolt comprises a shank and a head, said head defining a trailing end and said shank defining a leading end of said bolt, said shank comprising a threaded trailing portion having a thread pitch, and a threaded leading portion, said threaded leading portion having a thread start, wherein said threaded leading portion extends in the axial length of said leading portion from said thread start to the threaded trailing portion for a length (L) being three times the thread pitch of said threads of said trailing portion; and wherein a torque is needed to thread a matching nut onto said bolt; said leading portion of said bolt comprising a mechanical threading indicating element adapted to increase said torque needed to thread a matching nut onto said bolt, while said matching nut is in threaded engagement with the mechanical threading indicating element arranged on said leading portion of said bolt; said increase of said torque being in comparison to a required run-down torque when said matching nut has been threaded onto said bolt past said leading portion and onto said threaded trailing portion. A threading indicating system and a method for assembling a bolted joint are also disclosed.

An ultrasonic knife has a cutting portion formed with at least one cutting edge and a fastening portion. The fastening portion has an external thread for connection to a sonotrode. The cutting portion and the fastening portion are formed in one piece from cemented carbide material. The cemented carbide material includes hard particles that are, at least predominantly, formed by tungsten carbide and a metallic binder. The external thread of the fastening portion has a thread pitch p and is shaped such that the root of the thread turns has a rounded shape with a root radius R of 0.2*p≤R≤0.3*p.

A fastener includes: a shaft having longitudinal axis and a first and second threaded portions, the first and second threaded portions separated by a central portion having a reduced diameter between the first and second threaded portions, and at least one of the first or second threaded portions is chamfered to reduce friction on leading threads.

A fastener includes: a shaft having longitudinal axis and a first and second threaded portions, the first and second threaded portions separated by a central portion having a reduced diameter between the first and second threaded portions, and at least one of the first or second threaded portions is chamfered to reduce friction on leading threads.

A method of fastening gearbox housing components together, comprising: selecting a gearbox housing fastener comprising a straight shaft having a longitudinal axis, a first threaded portion, a single cylindrical central portion, and a second threaded portion, wherein the first and second threaded portions are separated by the cylindrical portion, wherein the cylindrical portion comprises a single reduced diameter that is less than first and second minor diameters of the first and second threaded portions, the first and second threaded portions are chamfered, and the fastener comprises a material having a tensile strength along the longitudinal axis that is greater than a sheer strength at the cylindrical portion; and fastening the gearbox housing components together with the fastener, wherein the first and third gearbox housing components are fastened with the first and second threaded portions, and the second gearbox housing component is positioned around the single cylindrical central portion.

The invention concerns a timepiece member including a first axis and a first threading intended to cooperate with 5 a second threading provided on a second timepiece member. The first threading is configured so that a zone of contact between the first threading and the second threading extends over less than 50% of the height of the threads of the second threading or is configured so that the zone of contact between the first 10 threading and the second threading extends over less than 0.3 times the pitch of the threading.

To threadedly engage a bolt and a female screw with each other, thereby making it possible to shave off a deposit on the inner surface of the female screw and to make it easy for a worker to sense the seating, there is provided a bolt including a shaft 2 and a head, wherein a first thread 11 is provided on a head side of the shaft, and at least one of a thread provided larger in diameter than the first thread and a thread provided wider than the first thread is provided on a tip end side of the shaft.

The present disclosure relates to a clamp having a band for substantially surrounding an object between a first end with a first opening and a second end with a second opening, a bracket, and a fastener. The bracket includes a base with a bottom surface for placement on a surface of the object and a wall. The base also includes a first base aperture for receiving the first end and a second base aperture spaced from the first base aperture for receiving the second end. The wall has a wall opening and extends substantially perpendicular to a top surface of the base. The fastener extends through the wall opening, the first opening and the second opening to secure the first end to the second end and moves the first end towards the second end to tighten the band and the base of the bracket to the surface of the object.

A high-strength screw (1) includes a head (2) and a threaded portion (5) including a thread (6) and a thread end (9) facing away from the head (2) in an axial direction. The threaded portion (5) includes an unhardened portion (12) starting at the thread end (9) and extending in an axial direction. The unhardened portion (12) has a hardness being reduced compared to an axial middle portion (11) of the threaded portion (5).