Standard bending geometries and dimensional requirements for reinforcing steel bar hooks and offsets include ninety-degree, one hundred eighty-degree, one hundred thirty-five-degree, and forty-five-degree bends as well as offset configurations. Pin diameters, extension lengths, and minimum tolerances are defined in terms of bar diameter d and bend diameter D. Specific criteria include a ninety-degree hook with four times bar diameter or two and one-half inches minimum extension, a one hundred thirty-five-degree hook with six times bar diameter or four inches minimum extension, and offset geometries utilizing a slope of twelve to two.
2 1/2" DIA. 6d OR 4" MIN. D 2 1/2" DIA. 90° HOOK: 4d OR 2 1/2" MIN. 45° HOOK D 180° HOOK D 12 d 2 1/2" DIA. OFFSET 2 d d 135°C HOOK D
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