While imported A307 Grade A hex bolts are readily available and very similar mechanically to F1554 Grade 36, most will not meet the strength requirements of F1554 Grade 36. Very few imported A307 Grade A hex bolts are available with mill test reports or traceability. When paperwork is available for A307 Grade A bolts, the yield strength is often not reported since A307 Grade A does not require a minimum yield strength. Without a reported minimum yield strength, an A307 Grade A bolt cannot be cross certified to F1554 Grade 36.