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.
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Radflo Off Road 2.0 Coilover 10 Travel 5/8 Shaft Emulsion With Dual Rate Spring Hardware - Radflo Suspension Technology
Associated Spring Raymond - Compression Spring: 0.089″ OD, 0.315″ Free Length - 69091072 - MSC Industrial Supply
Compression Spring, Steel, 11 Wire Gauge, 5/8 ID, 7/8 OD, 2 Length, 8-1/4 Coils, 90lbs Maximum Work Load - 89618
A spring is an elastic object that stores energy and is typically made of spring steel. Compression springs shorten with load and extension springs
Everbilt 0.625 in. x 0.250 in. - 0.5 in. x 0.054 in. Cone Spring 856198 - The Home Depot
Associated Spring Raymond - Compression Spring: 5/8″ OD, 2″ Free Length - 69085991 - MSC Industrial Supply
Value Collection - Compression Spring: 0.24″ OD, 5/8″ Free Length - 06810626 - MSC Industrial Supply
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RAYMOND, Heavy Duty, Chrome Silicone Alloy Steel, Die Spring - 44U689
Compression Springs - MSC Industrial Supply
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Raymond Die Spring, Medium Duty, 0.625x2-1/2 In 103310