Nail and Screw Pull-Out

Typical pull-out resistance by fastener and species.

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Formula and source

Withdrawal capacity W = G^2 × D × p × L_threaded for nails (NDS Eq. 11.2-3 form); lag-screw withdrawal per NDS Table 12.2A. G is wood specific gravity.

AWC NDS-2018 (National Design Specification for Wood Construction). Tables 11.2A / 12.2A.

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