https://www.stockspringscatalog.com/pc083-640-4250-mw-1000-c-n-in.html
PC083-640-4250-MW-1000-C-N-IN | Compression Spring Music Wir - Stock Springs Catalog Store
High-quality compression spring with 0.083" wire diameter, 0.64" outside diameter, 1.0" free length, and 175.35 lb/in spring rate for industrial use.