This SAE Recommended Practice covers the mechanical and chemical requirements of the best quality hard drawn carbon steel spring wire used for the manufacture of engine valve springs and other springs requiring high fatigue properties. It also covers the basic material and processing requirements of springs fabricated from this wire.
SAE J172-1994 history
1994SAE J172-1994 Hard Drawn Carbon Steel Valve Spring Quality Wire and Springs
1988SAE J172-1988 HARD DRAWN CARBON STEEL VALVE SPRING QUALITY WIRE AND SPRINGS