The fitted bolt K 42113 is a precision fastening and locating component designed for the camshaft assembly of the Adriadiesel/Jugoturbina/Zgoda/Sulzer ZV40/48 engine. Unlike a conventional fastening bolt, a fitted bolt is intended not only to provide secure clamping but also to ensure accurate relative positioning of the connected components through its precisely dimensioned fitted section. This is particularly important in a camshaft assembly, where alignment and angular accuracy directly influence the correct timing and operation of the associated engine mechanisms. During service, the K 42113 fitted bolt must withstand cyclic mechanical loads, vibration, shear forces, and prolonged heavy-duty operation without developing excessive clearance or deformation. Accurate dimensions, correct surface condition, suitable mechanical strength, and proper installation are therefore essential for reliable performance. During overhaul, the bolt, fitted bore, threads, and mating surfaces should be inspected carefully for wear, fretting, deformation, corrosion, or other damage. By combining secure fastening with precise component location, the K 42113 fitted bolt contributes to accurate camshaft alignment, stable timing, reduced unwanted movement, and dependable long-term operation of the ZV40/48 engine.