For use in corrosive or food-handling environments, these hoist rings function just like the more common HR-125UNC Hoist Ring series, except they're made from 316 stainless steel. Available in capacities from 400 - 50,000 lbs and thread diameters from 5/16" - 3-1/2". Rated at 100% at 90º. Each hoist ring is proof-tested to 2 times the Working Load limit with certification. They are fatigue rated to 20,000 cycles at 1-1/2 times the Working Load Limit. Each hoist ring also has a Product Identification Code (PIC) for complete material traceability. Top of washer is color-coded to quickly identify UNC threads.