Reinforcing bar hook and bend standards detail the required minimum bend diameters and extension lengths for various bar sizes. Principal reinforcement details specify standard 90-degree and 180-degree hooks with minimum bend diameters ranging from 6 db to 10 db depending on the bar size from number 3 through number 18. Number 3 through number 5 crossties and stirrups incorporate 90-degree and 135-degree bends with a minimum bend diameter of 4 db and a minimum extension of six bar diameters or three inches. Maximum offset bend geometries are detailed with a standard slope ratio.
Dmin Dmin Dmin 45° Dmin db 12 db (2 1/2" MIN) 4 db PRINCIPAL REINF #3 THRU #5 CROSSTIES & STIRRUPS 6 1 MAX OFFSET BEND (3" MIN) 6 db Dmin db (3" MIN) 6 db Dmin Dmin = 6 db FOR #3 THRU #8 Dmin = 8 db FOR #9 THRU #11 Dmin = 10 db FOR #14 THRU #18 Dmin = 4 db FOR #3 THRU #5 90° 180° 90° 135°
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