is a now-withdrawn German industrial standard titled "Cranes; Brakes; Mechanical Design, Calculation, and Testing." It was part of the renowned DIN 15000 series of crane standards, which formed the backbone of crane design and safety in Germany and many other countries for decades.
The standard defined minimum safety margins: Din 15058 Pdf
Standard axle holders are typically rectangular metal strips with two mounting holes. They engage with a circumferential or tangential groove milled into the axle or bolt. Standard Specifications Din 15058 Pdf