What happened to the ASTM A307 Grade C specification?

In August of 2007, ASTM A307 grade C was replaced by F1554 grade 36. ASTM A307 covers low carbon steel bolts and currently consists of grades A and B. Grade A covers bolts for general applications, while grade B covers heavy hex bolts and studs for cast iron flange connections. Until it was eliminated, A307 grade C covered unheaded, bent anchor bolts or straight rods. F1554 grade 36 has replaced A307 grade C and covers mild steel anchor bolts of any configuration including headed bolts.

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