Holding Strength of Metal Inserts in Wood

The increasing popularity of knock-down furniture and manufacturers’ continued interest in finding efficient joints has led to expanded use of threaded metal inserts. Withdrawal strengths for a range of both threaded and knock-in type fasteners from the face grain of several different wood species are presented. A regression equation, fitted to the face grain data, will adequately predict withdrawal strength based on insert diameter and length and shear strength of the wood for most threaded insert types. Coarse, interrupted quick pitch threaded and tapered inserts gave lower values while deep, fine threaded inserts gave higher values than predicted by the regression equation.

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