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2001 NDS & Wood screw tapered tip length

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Title: 2001 NDS & Wood screw tapered tip length

L_m=p-E      IF t_m=>p
L_m=t_m      IF t_m<p-E

Interpolate for cases where p-E < t_m <= p


L_m = MIN(p-2D, t_m)

For nails, E=2D is OK
For screws, E=2D is a little conservative, but I doubt if it would make much difference in the final number.



John "Buddy" Showalter, P.E.
Director, Technical Media
AF&PA/American Wood Council
1111 19th Street, NW, Suite 800
Washington, DC 20036
P: 202-463-2769
F: 202-463-2791

The American Wood Council (AWC) is the wood products division of the American Forest & Paper Association (AF&PA). AWC develops internationally recognized standards for wood design and construction. Its efforts with building codes and standards, engineering and research, and technology transfer ensure proper application for engineered and traditional wood products.

>The guidance provided herein is not a formal interpretation of any AF&PA standard.  Interpretations of AF&PA standards are only available through a formal process outlined in AF&PA's standards development procedures.


From: utej(--nospam--at)
To: <seaint(--nospam--at)>
Subject: 2001 NDS & Wood screw tapered tip length
2001 NDS Section states for lag screws that "Minimum penetration (not including the length of the tapered tip) of the lag screw...." and section states for wood screws that "Minimum penetration of the wood screw into the main member for single shear....shall be six times the diameter." The wood screw section does not specifically, unlike the lag screw section, state that the tapered tip should not be included in minimum penetration determination.

However, section 11.3.4 states "The length of dowel bearing shall not include the tapered tip of a fastener for fastener penetration lengths less than 10D." It seems that applies to wood screws as well. However, I can find no information on the length of the tapered tip for wood screws.

Does 2001 NDS section 11.3.4 apply to wood screws and, if so, what documents would give the length of the tapered tip for wood screws?