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Re: wood screw callout

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Mark,
 
Screw packaging can be misleading.  There are a number of screw products on the market that are proprietary.  They have unconventional configurations not in compliance with the NDS standards.  They may have # designations, but if you measure them with a caliper, you'll find that it's not clear what it is about the particular screw that makes it eligible for its size designation -- their shanks typically are smaller than the corresponding NDS screw.  This lack of correspondence may account for the use of # designations rather than gage designations.  Buyer [and specifier], beware.  Some of them have ICBO-ES reports and approved capacities -- in that case, they should be used in accordance with the Report, and not used as if they are equivalent to NDS screws.
 
Nels Roselund
Structural Engineer
South San Gabriel, CA
njineer(--nospam--at)att.net