deck screw pull out capacities

Provides users with a web-based approach to calculating capacities for single bolts nails lag screws and wood screws per the 2015 NDS. Both lateral (single and double shear) and withdrawal capacities can be determined. Wood-to-wood wood-to-concrete and wood-to-steel connections are possible. 【Get Price】

I highlighted the two rows corresponding to commonly used types of nails and screws. In general screws have much greater pullout power than similar sized nails but slightly less shear capacity. 【Get Price】

The SDS Strong-Drive 1/4" wood screw line has expanded to include stainless-steel SDS screws in 1 1/2" to 3 1/2" lengths suitable for fastening Simpson Strong-Tie stainless-steel products. Offering the same easy-driving split-reducing installation of the standard SDS screw these screws are made from Type 316 stainless steel. 【Get Price】

D = diameter of screw (in) Example - Screw Withdrawal Load. The specific gravity of Canadian Spruce is 0.45. The diameter of no. 10 screw is 0.190 inches. The withdrawal force per inch of penetration can be estimated as. F = 2850 (0.45) 2 (0.190 in) = 109 lb per inch of penetration . Screw Withdrawal Force Calculator Imperial Units 【Get Price】

Both have essentially the same diameter while comparing 0.162 inches (nail) with 0.164 inches (screw). I might just build something out of three 2x4s using four 3-1/2" screws and slide this into a concrete test cylinder tester and see what the ultimate capacity of four screws would be. Thanks 【Get Price】