ASTM A563
ASTM A563 Grade DH heavy hex nuts are high-strength fasteners engineered for use with structural bolts such as ASTM F3125 Grade A490. Made from quenched and tempered medium-carbon steel, these nuts deliver exceptional hardness, load-bearing strength, and resistance to deformation under stress.
Available in plain and hot-dip galvanized finishes per ASTM F2329 standards, Grade DH nuts provide reliable corrosion protection and performance in demanding environments. Ideal for bridges, high-rises, and heavy structural connections, they ensure secure, long-term fastening where strength and precision are essential.
