While Roloff/Matek Maschinenelemente is famously known as the "Bible of Mechanical Engineering" in Germany, finding a full official English PDF is often difficult because the primary textbook is published almost exclusively in German and Dutch. Overview of the Roloff/Matek Reference Work
Engineers hunt for this specific book because it goes where most English textbooks stop. For example: Diversity of Solutions: roloff matek maschinenelemente pdf english
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The Search for the "English Roloff/Matek": Does a Translation Exist? : A highly practical alternative that even includes
: A highly practical alternative that even includes software modules aligned with European DIN standards, similar to those used in Roloff/Matek. Design of Machinery roloff matek maschinenelemente pdf english