<![CDATA[EC21 Product Catalogs - heavy hex structural bolts]]> <![CDATA[Yushung Bronze Nuts Phosphor Bronze Heavy Hex Nuts B139 C521000 3/8" 1/2" 5/8" 3/4" 7/8" 1"]]> <![CDATA[ASTM A563 & ASTM A563M GradeA,B,C,DH Heavy Hex Structural Nuts]]> <![CDATA[Hex Nuts]]> <![CDATA[ASTM A563 Heavy Hex Structural Nut]]>