FAQ

ESR-4948
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Most Widely Accepted and Trusted Page 4 of 8
TABLE 4—REFERENCE PULL THROUGH DESIGN VALUES (W
H
)
1,2
SCREW SIZE
MINIMUM SIDE MEMBER
THICKNESS, t
s,w
(inches)
REFERENCE PULL-THROUGH DESIGN VALUE, W
H
(lbf)
0.42 ≤ ASG < 0.50 ASG ≥ 0.50
Large Hex Washer Head Screws
3
/
8
1.50 560 n/a
3
/
8
2.00 n/a 750
Wafer Head Screws
3
/
8
1.50 280 n/a
3
/
8
2.00 n/a 400
For SI: 1 inch = 25.4 mm, 1 lbf = 4.45 N.
1
Tabulated values must be multiplied by all adjustment factors included in the NDS for dowel-type fasteners to determine
allowable loads for use with ASD and/or design loads for use with LRFD.
2
Tabulated values are applicable to screws installed perpendicular to the faces of the wood members.
T
ABLE 5—REFERENCE LATERAL DESIGN VALUES (Z) FOR TWO MEMBER WOOD-TO-WOOD CONNECTIONS
1,2,3,4
SCREW
SIZE
MINIMUM
O
VERALL
LENGTH
(inches)
SIDE
MEMBER
THICKNESS
t
s,w
(inches)
MINIMUM
PENETRATION
IN MAIN
MEMBER
(inches)
Z (lbf) FOR FOR ASSIGNED SPECIFIC
GRAVITIES (
A
S
G
) OF:
0.42 ≤ ASG < 0.50
Parallel to Grain,
Z
‖
Perp. to Grain, Z
⊥
Large Hex Washer Head Screws
3
/
8
4 1
1
/
2
2½ 340 340
Wafer Head Screws
3
/
8
4 1
1
/
2
2½ 335 315
For SI: 1 inch = 25.4 mm, 1 lbf = 4.45 N.
1
Tabulated values must be multiplied by all adjustment factors included in the NDS for dowel-type fasteners
to determine allowable loads for use with ASD and/or design loads for use with LRFD.
2
Tabulated values are applicable to screws installed perpendicular to the faces of the wood members.
3
The wood main member thickness must be equal to or greater than the screw length less the thickness of
the wood side member.
4
The tabulated lateral design values are based on both wood members having the same specific gravity.