ADB Safety Engineered Hoist Rings are designed with a design factor of five times the rated capacity cased in any lifting direction. However, the user is reminded that it should not be used to lift loads that exceed the rated capacity. The material type C4-4140 used in ADB Safety Engineered Hoist Ring components conform to the chemical requirements of Mil-S-5626, AMS-2301, ASTM A-331, ASTM A-322. They are designed to exceed the following military specifications and ASTM standards: MIL-STD-1365, General design criteria for handling equipment associated with weapons systems; Mil-STD-209C, Slinging and tie down provisions for lifting and tying down military equipment; ASME B30.26, Safety Standards for cableways. cranes, derricts, hosts, hooks, lacks and slings. The surface finish is Black Oxide per MIL-DTL-13924B. They are not exposed to any equipment or material known or suspected of having Mercury or Polychlorinated Biphenyls. Hoist rings are magnetic particle inspected in accordance with ASTM E 1444. Rings are neat treated to 36-48 Rc per mIL-H-6875. Meets Military Specification No. MIL-STD 209, Meets ANSI/ASME B30.26. Heavy Duty Hoist Rings are specified and used in nuclear energy equipment.