ASTM A320 Grade L7M Stud Bolt is high-strength alloy steel fastener designed for low-temperature service, featuring compliance with NACE MR0175/ISO 15156 for sour gas environment. They offer lower strength but better ductility and notch toughness than L7. Commonly coated (Xylan/PTFE) to enhance corrosion resistance, they are used in oil & gas, pressure vessels, and valves. Typically paired with ASTM A194 Grade 7M nuts.