Reinforcing bar bending details specify standard hook dimensions and bend diameters for various bar sizes. A one-hundred-thirty-five degree hook requires a bend diameter equal to six times the bar diameter for number three through number eight bars, eight times the diameter for number nine through number eleven bars, and ten times the diameter for number fourteen through number eighteen bars. The hook extension requires six times the bar diameter or a minimum of four inches. Offset bar configurations utilize specified bending slopes and two-and-one-half-inch diameter pins.
2 1/2" DIA. D = 6d FOR #3 - #8 D = 8d FOR #9 - #11 D = 10d FOR #14 - #18 6d OR 4" MIN. 12 2 1/2" DIA. OFFSET 2 &+22. D
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