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ASTM a193/a320 - b7/b7m/l7/l7m fully threaded rods/stud-dia. 1/2 ~ 3-1/2. ASTM a193 - b16 full threaded rods ASTM a193/a320 - b7/b7m/l7/l7m heavy hexagon bolt AISI 4140 alloy steel pitch diameter bar-finished -for b7/l7 thread rod.