日本語 から 英語 技術/工学 エネルギー/発電 Stem turbines

This is a piece of lead wire of a known thickness that is placed between two parts, the parts are assembled and tightened down to their original positions, taken apart again, and the degree to which the wire is crushed is measured to determine the gap between the parts. I have translated it just as "lead wire", but if anyone can think of a better translation, or if there is a specific technical term for this, please let me know.