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ASTM A193 B7 B7M B16 threaded steel rods 1/2'' to 4'' 8-13unc threaded rod ASTM A193: B7, B7M, B16, B8 class 1, B8 class 2, B8M class 1, B8M class 2, B8T etc. ASTM A320: L7, L7M, L43, B8 class 1, B8 ...