Wood Screws

Allowable withdrawal load

Allowable withdrawal load of a common wood screw into side grain perpendicular to the fibers of seasoned dry wood can be expressed as

P = 2.85 SG2 D  (1)

where

P = allowable withdrawal load per inch (mm) of penetration (lb, N)

SG = specific gravity of oven dry wood

D = diameter of nail or spike (in, mm)

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