This drawing outlines the standard hook geometry and finished bend diameters for reinforcing bars ranging from size #3 to #18. It provides dimensional requirements for both 90-degree and 180-degree hooks, detailing bar sizes, finished bend diameters, extension lengths, and development points. The associated table gives specific values for each bar designation to ensure proper anchorage in reinforced concrete structures.
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 2 TYPICAL STANDARD HOOK GEOMETRY #18 22.5 27 9 #14 17 20.25 6.75 #11 11.25 17 5.75 #10 10.25 15.25 5 #9 9 13.5 4.5 #8 6 12 4 #7 5.25 10.5 3.5 #6 4.5 9 3 #5 3.75 7.5 2.5 #4 3 6 2.5 #3 2.25 4.5 2.5 lext lext BAR SIZE D 90° HOOKS 180° HOOKS ALL GRADES (D) FINISHED BEND DIAMETER STANDARD HOOK
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