A307B heavy hex bolts are popular in DT fastener's product range. DT could offer customers with high competitive A307B bolts. In recent years, metric heavy hex bolts have been widely used, and the common ones are A307B heavy hex bolts, etc. You can find the use of A307B heavy hex bolts widely in steel structure construction, machinery industry, and oil pipelines.
ASTM A307B Equivalent Norms: ASME B 18.2.1 - 2012 Heavy Hex Bolts
When the bolt length L is less than the thread length b value in the table, it should be processed as full thread.