The expansion bolt with code number K 34127 is a specialized fastener used in securing the upper part of the piston in the Adriadiesel/Jugoturbina/Zgoda/Sulzer ZV40/48 diesel engine. Designed to endure high thermal loads, this bolt compensates for expansion and contraction during engine operation, maintaining consistent tension and alignment. Its ability to flex slightly under heat ensures structural integrity and prevents stress fractures in the piston assembly. This precision-engineered bolt plays a critical role in extending piston life and ensuring reliable engine performance under extreme conditions.