ASTM A563 Grade DH - Made in the USA

Click to Enlarge
Often paired with ASTM A325 Bolts as well as ASTM F1554 Grade 105 All Thread Rod and Anchors.  

Hot Dip Galvanized ASTM A563 Grade DH Heavy Hex Nuts are tapped oversized to accommodate for the plating thickness. The Nuts are also provided with a lubricating dye that is dry to the touch, and which makes them visually obvious as per Supplementary Requirement S1.