Standard rebar bending details illustrate dimensional requirements for 90-degree, 180-degree, 135-degree, and 45-degree hooks, along with bar offsets. Minimum bend diameters are specified as 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. Hook extensions and pull dimensions are explicitly detailed relative to bar diameters and minimum lengths.
D = 6d FOR #3 - #8 D = 8d FOR #9 - #11 D = 10d FOR #14 - #18 6d OR 4" D 2 1/2" DIA. 90° HOOK: 4d OR 2 1/2" MIN. 45° HOOK D 12d 180° HOOK D 12 d 2 1/2" DIA. OFFSET 2 d d d 135°C HOOK D
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