??? T-nuts are factory installed in the holes of the ready-to-assemble furniture components. There is a risk that the t-nut spontaneously falls out during transport or storage and get lost; the t-nut can also be pushed into inaccessible spaces during assembly. These complications can make furniture assembly impossible. For this reason, sufficient force to hold the t-nut in the hole is essential. The article presents the test results of the forces holding the t-nuts in five furniture materials (softwood, Oriented Strand Board, plywood, and particleboard in two variants). The M6 t-nuts with four prongs were installed in predrilled 8 mm holes. The resistance to withdrawal of the t-nuts was measured with a universal testing machine. The tested materials could be divided into three groups in terms of the risk of the t-nut falling out: softwood and plywood ??? low risk, F = 1113.2-1158.0 N; OSB and particleboard ??? moderate risk, F = 592.3-645.5 N, particleboard with a pad ??? high risk, F = 645.5 N. The results show that the withdrawal re-sistance is not correlated with the density of the wood material, and that it decreased with the degree of wood material processing ??? the less processed the material, the greater the resistance to withdrawal of the t-nuts.
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