metric wedge anchors

The term headed shear stud refers to a type of anchor bolt with a head, usually made from high-strength steel, that is embedded into the concrete during its placement. The stud's head, which is larger than its shank, serves as a mechanical anchor, distributing the load over a wider area and preventing pull-out failure. The term headed shear stud in URL format signifies the importance of this subject in online discussions and resources related to construction and engineering.

...

Butterfly screws, also known as wing nuts or butterfly nuts, are a distinctive type of fastener that have gained popularity in various engineering and design applications due to their unique shape and functionality. These screws derive their name from their appearance, which resembles a butterfly in flight when the wings are fully opened. The wings serve as handles, allowing for quick and easy tightening or loosening by hand without the need for additional tools.

...

Another important aspect of bolt structure is the threading. The threading of a bolt refers to the grooves that wrap around the shank of the bolt. The threads on a bolt are what allow it to be screwed into a nut or a threaded hole in a material. The pitch, or distance between each thread, can vary depending on the application of the bolt. Coarse threads are better suited for applications where quick assembly is required, while fine threads are used for applications that require higher strength and precision
bolt
bolt structure.

...