See the 1997 National Design Standard (NDS) published by the American Forest
and Paper Association. Section 9 contains rules for design of lag screw
connections in wood. The rules are based on lag screws that conform to
ANSI/ASME Standard B18.2.1-1981. Appendix L of the NDS gives lag screw
dimensions, and a footnote to Table 9.3A gives yield strengths of lag
screws -- they vary with diameter.
My experience has been that commonly available lag screws do not necessarily
have unthreaded-shank lengths that comply with the Appendix L dimensions.
Question: has anyone written project specifications that required compliance
with the ANSI Standard for lag screws and then seen documentation indicating
that the lag screws used on the project comply with the Standard?
From: Ken Peoples <lvtakp(--nospam--at)yahoo.com>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: Wednesday, January 03, 2001 5:57 AM
Subject: lag screw standard?