The cylindrical screw, code 06.02093-0820-1.B, is a precision fastening element used in the assembly of the MAN L21/31 engine, designed to provide secure and reliable connections between structural and functional components. Featuring accurately machined threads and a robust cylindrical head, it ensures consistent clamping force and precise alignment under mechanical loads, vibration, and thermal cycling. Manufactured from high-strength materials and often treated for corrosion resistance, this screw offers durability and long service life even in harsh operating environments. By maintaining stable fastening conditions and supporting structural integrity, the cylindrical screw plays an important role in the overall reliability and safety of the engine.