DIN 916 Set Screw, Cup Point, HR45, Zinc-Plated

Cup point.
Hardness 45H.
Metric thread.
Steel, bright zinc plated (ZN).
NOTE! Set screws are designed for compressive loads and are not suitable for tensile or shear loads.

Set screws, grub screws.
These products are mainly used in shafts to lock, for example, a bearing onto a shaft or into a bearing housing, and as adjustment screws, for example, to limit movement.
A set screw is a so-called "headless" screw, with the drive recessed into one end of the product.
Several different types are available (flat, cup, cone, dog point) depending on the application.