Unifit Metalloys offers in-depth technical insights on ASTM A563 Grade DH hex nuts, their properties, applications, and compatibility with ASTM A325 Type-1 bolts. Grade DH nuts are quenched and tempered heavy hex nuts used in structural and engineered fastening systems, providing high strength and reliable performance in construction and industrial projects. https://www.unifitmetalloys.com/blog/astm-a325-type-1-bolts-a563-hex-nuts/