Timber Connection Design: lag_screw
NDS 2018 (AWC) timber connection design values — dowel bearing strengths, withdrawal design values, and lateral design values (Z) for common nails, box nails, sinker nails, wood screws, lag screws, bolts, split ring connectors, shear plate connectors, and timber rivets by wood species group
| fastener type | record id | CD load duration typical | CM wet service | Cg group action | Ct temperature | Fe parallel psi (psi) | Fe perp psi (psi) | Fe small D psi (psi) | Z double shear lb (lb) | Z single shear lb (lb) | edge distance in (in) | end distance parallel in (in) | end grain factor Ceg (dimensionless) | fastener bending yield Fyb psi (psi) | fastener diameter in (in) | fastener length or size | min member thickness in (in) | notes | penetration depth min in (in) | row spacing in (in) | species group | specific gravity G (dimensionless) | toe nail factor Ctn (dimensionless) | withdrawal W lb per in (lb/in) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| lag_screw | ls_dfl_0375 | 1 | 0.75 | 1 | 1 | 5,600 | 3,153 | 0 | 0 | 280 | 2.25 | 4.5 | 0.67 | 45,000 | 0.375 | 3/8 in lag screw | 2.5 | 3/8 in lag screw D=0.375 in; Fe_par=11200*0.50=5600 psi; Fe_perp=6100*(0.50)^1.45/(0.375)^0.5=6100*0.345/0.612=3438 psi (main member); W=1800*(0.50)^1.5*(0.375)^0.75=1800*0.3536*0.5274=334 lb/in thread penetration; min penetration=8D=3.0 in; Z=280 lb single shear 1.5 in side member Mode IV controlling Fyb=45000 psi (D>3/8 per NDS Appendix I) | 3 | 3 | Douglas Fir-Larch | 0.5 | 0 | 334 |
| lag_screw | ls_dfl_0500 | 1 | 0.75 | 1 | 1 | 5,600 | 2,732 | 0 | 0 | 390 | 3 | 6 | 0.67 | 45,000 | 0.5 | 1/2 in lag screw | 3.5 | 1/2 in lag screw D=0.500 in; Fe_par=11200*0.50=5600 psi; Fe_perp=6100*(0.50)^1.45/(0.500)^0.5=6100*0.345/0.7071=2977 psi; W=1800*(0.50)^1.5*(0.500)^0.75=1800*0.3536*0.5946=380 lb/in; Z=390 lb single shear 1.5 in side member | 4 | 4 | Douglas Fir-Larch | 0.5 | 0 | 380 |
| lag_screw | ls_dfl_0625 | 1 | 0.75 | 1 | 1 | 5,600 | 2,444 | 0 | 0 | 492 | 3.75 | 7.5 | 0.67 | 45,000 | 0.625 | 5/8 in lag screw | 4.5 | 5/8 in lag screw D=0.625 in; Fe_par=11200*0.50=5600 psi; Fe_perp=6100*(0.50)^1.45/(0.625)^0.5=6100*0.345/0.7906=2661 psi; W=1800*(0.50)^1.5*(0.625)^0.75=1800*0.3536*0.6588=420 lb/in; Z=492 lb single shear 1.5 in side member | 5 | 5 | Douglas Fir-Larch | 0.5 | 0 | 420 |
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