Reinforcing bar hook details show standard dimensions for 180-degree and 90-degree bends. The 180-degree hook features a bend diameter D, a detailing dimension, a hook extension dimension A or G, a tail length of four bar diameters or two and one-half inches minimum, and an inside bend diameter J. The 90-degree hook includes a bend diameter D, a hook extension dimension A or G, and a tail length of twelve bar diameters.
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