Standard reinforcing bar hook geometry details illustrate the dimensional requirements for 90-degree and 180-degree hooks in concrete structures. Each hook configuration indicates bar diameter, bend diameter, extension length, and total development length measured from the point at which the bar is developed.
90 DEGREE HOOK 180° 2" 1 /2" 1 /2" 6 1/4" 90° d b d b l ext l ext 180 DEGREE HOOK 15" l dh POINT AT WHICH BAR IS DEVELOPED 2 " ø 2 " ø D 15" l dh POINT AT WHICH BAR IS DEVELOPED D 90 DEGREE HOOK 180° 2" 1/2" 1/2" 6 1/4" 90° d b d b l ext l ext 180 DEGREE HOOK 15" l dh POINT AT WHICH BAR IS DEVELOPED 2" ø 2" ø D 15" l dh POINT AT WHICH BAR IS DEVELOPED D
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