R 408.15225 Chain, chain slings, and chain fittings.

Rule 5225. (1) A chain and its component parts, other than alloy steel chain having a minimum tensile strength of 125,000 pounds per square inch, shall have a safety factor of not less than 5. Alloy chain shall not be used in excess of the working load in straight tension for its size as prescribed in table 1. (2) A chain used in load-carrying service shall be inspected before initial use and weekly thereafter. Chain with bent, twisted, or elongated links or hook that has been open more than 15% at the throat from the original set or twisted more than 10% from the plane of the unbent hook shall not be used until the defective part is replaced. (3) A bolt or nail shall not be used to shorten or join links together. (4) Installation, inspection, maintenance, repair, and testing of chains shall be done only by an employee qualified to do such work. (5) Proper storage shall be provided for slings while not in use. (6) If, at any time, any 3-foot length of chain is found to have stretched 1/3 the length of a link shall be discarded. (7) Table 1 reads as follows: Table 1 Working load – Single chain Nominal Size, Chain Bar, In. Work Load, Lb. Max. 1/4 3,250 3/8 6,600 1/2 11,250 5/8 16,500 3/4 23,000 7/8 28,500 1 38,750 1 1/8 44,500 1 1/4 57,500 1 3/8 67,000 1 1/2 80,000 1 3/4 100,000