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All Yoke Heavy Duty Hoist Rings meet or exceed all the requirement of ASME B30.26. Each forged parts and cap screw with Batch code links to Test Certificate sheet. Hoist Ring Ball are designed by forged alloy steel,quenched and tempered. Hoist Rings are 360Deg. swivel with 180 Deg. pivot function. Dacormet finished for increased anti-corrosion. Bolt are Metric thread(ASME/ANSI B18.3.1M),specification is a graded 12.9 alloy socket head screw per Din 912. Proof load inidvidually to 2.5 times Working Load Limit and certified. 20,000 cycle fatigue rated to 1.5 times Working Load Limit. Rated at 100% at 90 angle. 100% magnaflux crack detection.