<![CDATA[EC21 Product Catalogs - a563 dh]]> <![CDATA[Astm A563 Gc/Dh Heavy Hex Structural Nut]]> <![CDATA[ASTM A563 & ASTM A563M GradeA,B,C,DH Heavy Hex Structural Nuts]]> <![CDATA[ASME B 18.2.6 Heavy Hex Nuts (ASTM A563/ A194/ A194M): 2H, 2HM, 7, 7L, 7M, 8/8A, DH, 8S, 10S,10,12]]>