Standard 90-degree and 180-degree concrete reinforcing bar hook geometry and development length dimensions. Standard hooked bar configurations incorporate development length, bar diameter, bend diameter, and extension length variables. The point at which the bar is developed is measured from the critical section to the end of the hook.
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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