Reinforcing bar hook details display standard bend geometries and embedment lengths for concrete masonry unit construction. The 180-degree hook configuration specifies a bend diameter D equal to four bar diameters or a two-and-a-half inch minimum, with a tail extension of four bar diameters or two-and-a-half inches minimum. The 135-degree hook requires a bend diameter of six bar diameters or two-and-a-half inches minimum. The 90-degree hook specifies tail extensions based on bar size, requiring six bar diameters or two-and-a-half inches minimum for number five bars and smaller, and twelve bar diameters for number six bars and larger. Development length dimensions Le and lap splice lengths Lcmu are indicated alongside bar diameter references db.
1" 90 DEGREE HOOK 12" 6" db D 4db, OR 2 1/2" MIN db 180 DEGREE HOOK 6" db D 4db, OR 2 1/2" MIN 49" 7" Lcmu Le 48 1/2" 7" Lcmu Le 8" db 135 DEGREE HOOK 6" db D 6db, OR 2 1/2" MIN 49" 7" Lcmu Le ≤#5 BAR: 6db OR 2 1/2" MIN ≥#6 BAR: 12db
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