Holding strength of screws in plywood and oriented strandboard

Tests were carried out to determine the holding strength of screws in the face and edges of plywood and oriented strandboard (OSB). Ten distinct proprietary boards were included in the study: three southern pine plywood, one Douglas-fir plywood, one hardwood plywood, and five OSB boards. Sheet metal type screws of sizes including 6AB, 8AB, 10AB, 12AB, and 14AB were used in the study. Initial tests were conducted to determine optimum pilot hole diameters. Predictive expressions were fitted to the results, which enable the withdrawal strengths of screws embedded in these materials to be predicted as a function of screw diameter and depth of penetration, and density of the board material.

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