Reinforcing bar hook development details defining bend diameters and tail extensions for 90-degree, 135-degree, and 180-degree standard hooks. The 180-degree hook requires a bend diameter D with a tail extension of 4 bar diameters or two and a half inches minimum. The 135-degree hook requires a bend diameter D with a tail extension of 6 bar diameters or two and a half inches minimum. The 90-degree hook requires a bend diameter D with a tail extension of 6 bar diameters or two and a half inches minimum for bar sizes number 5 and smaller, and 12 bar diameters for bar sizes number 6 and larger.
1" 90 DEGREE 12" 6" db D 4db, OR 2 1/2" MIN db 180 DEGREE 6" db D 4db, OR 2 1/2" MIN 8" db 135 DEGREE 6" db D 6db, OR 2 1/2" MIN ≤#5 BAR: 6db OR 2 1/2" MIN ≥#6 BAR: 12db
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