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Standard Hook Bend diameters

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I am looking at standard bend diameters at hooks.  In the ACI Notes section 7.1 the minimum bend diameters for #3 through #8 bars calls for 6 bar diameters at the inside face of the bar (for primary reinforcing. Section 12.5 shows 4 bar diameters to the outside face of the bar.  Why and what is the difference here?  They both refer to “Standard Hooks”