Bolt Array: Steel Grades, Finishes, and Application Range NIULUNBAO creates an organized fastener array covering alloy steel qualities 8.8, 10.9, and 12.9, as well as 304 stainless-steel, across hex head, switch head, hex socket, and flat head setups in both metric and unified thread standards. Quality classification straight establishes tensile toughness and yield factor– 8.8 […]