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TABLE 6—CONNECTION GEOMETRY REQUIREMENTS
1,2,3
CONDITION
REQUIRED DIMENSION
ASG < 0.50 ASG ≥ 0.50
End distance
Tension loading parallel to grain
(fastener bearing toward end)
15D 20D
Compression loading parallel to grain
(fastener bearing away from end)
10D 15D
Loading perpendicular to grain 10D 15D
Axial loading
(fastener withdrawal or pull-through)
10D 10D
Edge distance
Loading parallel to grain 5D 7D
Loading
perpendicular
to grain
Load toward edge 10D 12D
Load away from edge 5D 7D
Axial Loading 4D 4D
Spacing between
fasteners in a row
(parallel to grain of main
member)
Loading parallel to grain 15D 15D
Loading perpendicular to grain 10D 10D
Axial loading 7D 7D
Spacing between rows
(perpendicular to grain
of main member)
Lateral
loading
In-line rows –
loading parallel to grain
5D 7D
In-line rows –
loading perpendicular to grain
5D 5D
Axial loading 5D 5D
1
End distances, edge distances and fastener spacing must be sufficient to prevent splitting of the wood, or as
required by this table, whichever is the more restrictive.
2
Wood member stresses must be checked in accordance with Section 11.1.2 and Appendix E of the NDS, and
end distances, edge distances and fastener spacing may need to be increased accordingly.
3
D refers to the outside thread diameter.
Large H
ex Washer Head Wafer Head
FIGURE 1—HILLMAN
TM
STRUCTURAL SCREWS