STUD ASTM A-193 GRADE B7, ASTM A193 Alloy Steel and stainless steel bolting materials for high-temperature service. ASTM A307 Carbon steel externally threaded standard fasteners ASTM A320 Alloy steel and stainless steel fasteners for low-temperature service ASTM A325 High strength structural steel bolts for connecting structural steel joints ASTM A354 Quenched and tempered alloy steel bolts, studs, and other externally threaded fasteners ASTM A449 Quenched and tempered