Screwholding Performance in Hardwoods and Particleboard

Screw withdrawal tests were carried out on various species of hardwood and particleboard samples in order to evaluate formulas which had previously been developed to predict the holding strength of screws in wood and particleboard type materials. Results of these tests indicate that shear strength parallel to grain is a better predictor of holding strength in solid wood than specific gravity. On the other hand, specific gravity is a good indicator of holding strength in particleboard. Expressions are given in this paper which enable furniture manufacturers to predict the average holding strength of screws in both solid wood and particleboard materials.

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