Standard hooks for ties and stirrups number 5 and smaller require a 135-degree bend with a minimum extension of 6db or two and a half inches, whichever is greater. The minimum diameter of bend D follows standard reinforcing specifications for bar sizes number 8 and smaller.
6db OR 2 1/2" MIN 135° D D 2 1/2" MIN 6db STANDARD HOOKS FOR TIES AND STIRRUPS #5 AND SMALLER MINIMUM DIAMETERS OF BEND D 6 db - #8 OR SMALLER
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