Heavy Duty Hoist Ring Threaded Stud Specifications: 5/8 inch diameter, 11 threads per inch, Working Load Limit: 4000 pounds Forged and machined high strength alloy steel, Black Oxide Finish for corrosion resistance Minimum Design Factor = 5:1, Magnetic Particle Inspected Per ASTM E1444, Hoist Rings retain the same rated load from 0 to 90 degrees from the bolt axis Meets Military Specification No. MIL-STD 209, Meets ANSI/ASME B30.26 Proudly Made in the USA, ABD Part Number: 33615