Timber Connection Design: bolt
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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| bolt | bt_dfl_0500 | 1 | 0.75 | 1 | 1 | 5,600 | 2,732 | 0 | 930 | 580 | 1.75 | 3 | 0.67 | 45,000 | 0.5 | 1/2 in A307 bolt | 3.5 | 1/2 in bolt; Fe_par=11200*0.50=5600 psi; Fe_perp=6100*(0.50)^1.45/(0.500)^0.5=2977 psi; Fyb=45000 psi per NDS Appendix I; min member thickness both sides 3.5 in; Z single shear 1.5 in side member=580 lb Mode IV; Z double shear=930 lb; bolt hole=D+1/32 in | 4 | 3 | Douglas Fir-Larch | 0.5 | 0 | 0 |
| bolt | bt_dfl_0750 | 1 | 0.75 | 1 | 1 | 5,600 | 2,232 | 0 | 1,390 | 870 | 2.63 | 3.75 | 0.67 | 36,000 | 0.75 | 3/4 in A307 bolt | 5.5 | 3/4 in bolt D=0.750 in; Fe_par=11200*0.50=5600 psi; Fe_perp=6100*(0.50)^1.45/(0.750)^0.5=6100*0.345/0.8660=2431 psi; Fyb=36000 psi A307 per NDS Appendix I; Z single=870 lb Mode III/IV; Z double=1390 lb | 6 | 3 | Douglas Fir-Larch | 0.5 | 0 | 0 |
| bolt | bt_dfl_0750_steel | 1 | 0.75 | 1 | 1 | 5,600 | 2,232 | 0 | 0 | 1,390 | 2.63 | 3.75 | 0.67 | 36,000 | 0.75 | 3/4 in A307 bolt wood-to-steel single shear | 3.5 | 3/4 in bolt wood-to-steel single shear; steel side plate is rigid so Fe_steel>>Fe_wood; Z governed by wood bearing; Z=1390 lb per NDS Table 12E (wood-to-steel); higher than wood-to-wood single shear (870 lb) because steel side does not yield | 6 | 3 | Douglas Fir-Larch | 0.5 | 0 | 0 |
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