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Ledger to stud connection

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I noticed in the 2001 NDS (Table 11J) that the value of a 3/8" lag screw through a 2x ledger (Hem-Fir side member) into a stud (also Hem-Fir) is zperp = 120#. In Table 11N, the value for a 16d nail in a similar setup is 122#. Why such a small difference in values with such a large difference in dowell diameters? I am planning on checking these values using the yield limit equations tomorrow.

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