Products Categories Padlocks Extreme Environment Extreme Environment These Marine Grade padlocks are tough enough for industrial or commercial use. Heavy duty, solid steel bodies, smooth design and attack-resistant protective shrouds give these padlocks superb performance under extreme weather conditions or attack. Y90SS/45/129 Yale Marine Grade Stainless Steel Padlock 47mm Y300/63/127 Yale Black Series Hardened Steel Padlock 63mm Y300C/63/127 Yale Black Series Closed Shackle Padlock