Standard rebar bending details show dimensional requirements for 90-degree, 135-degree, and 180-degree hooks, as well as typical column bar offsets. Minimum extension dimensions and bend diameters are defined for bar sizes ranging from number 3 through number 18. A table provides specific diameter values D and D prime for various bar sizes, with ties and stirrups utilizing standard hooks unless otherwise noted.
d b GREATER OF 6d b AND 3" MIN 135° HOOK 90° HOOK d b TYPICAL COLUMN BAR OFFSET 2 12 2 12 180° HOOK 90° HOOK TIES & STIRRUPS HOOKS ONLY STANDARD HOOKS BAR SIZE D' #3 1 1/2" #4 2" #5 2 1/2" BAR SIZE D #3 THRU #8 6d b #9 THRU #11 8d b #14 THRU #18 10d b D d b d b 12d b UNO GREATER OF 4d b AND 2 1/2" 6db 6d b D' 8 1/4 " 10 3/8" 1 1/16" 1 1/16" 10 3/8" D 1 1/16" D' 1 1/16" 90° HOOK
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