A 5/8” (0.625) outer diameter compression spring has an outer diameter of 0.625 inches and may have a free length between 9/32 (0.281) of an inch to 15 inches. You will find them in stock compression spring catalogs where you may buy ready-made springs.
Stock Compression Springs Compression Spring Over 70 Trillion spring designs
CREEYA Compression Springs Assortment Kit, 15 Different Sizes 225pcs Mini Stainless Steel Springs for Repairs, 0.39 to 1.18 Length, 0.16 to 0.23 OD, 10mm - 30mm Length, 4-6mm OD: : Industrial
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Stock Helical Springs Compression Spring Over 70 Trillion spring designs
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5/8 (0.625 inches) OD Compression Springs Compression Spring Over 70 Trillion spring designs
5/8 (0.625 inches) OD Compression Springs The Spring Store - Over 70 Trillion Custom & Stock springs