Standard bend dimensions for a 135-degree seismic stirrup and tie hook in reinforcing steel require an extension tail length of a minimum of six bar diameters or three inches, whichever is greater. Bend diameters vary by bar size, specified as six times the bar diameter for number three through number eight bars, eight times the diameter for number nine through number eleven bars, and ten times the diameter for number fourteen through number eighteen bars.
D = 6d FOR #3 THRU #8 D = 8d FOR #9 THRU #11 D = 10d FOR #14 THRU #18 6d OR 3" MIN 135° HOOK SEISMIC STIRRUP / TIE . D
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