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This study was carried out in order to determine the effect of shoulder thickness (including 1.5, 5, 10, 15 and 18.5 mm), loose tenon length (15, 20, 25, 30, and 35mm), width of loose tenon (20, 25, 30, 35, and 40mm), and loose tenon wood species (Beech, walnut, oak, sycamore, poplar, and fir) on bending moment capacity of mortise and loose tenon joint. Polyvinyl acetate (PVAc) adhesive was utilized in constructing joint specimens. Totally 100 T-type joints were made and tested in the same way. The results showed that the difference between the groups was highly significant in terms of shoulder thickness, loose tenon length, and width of loose tenon. Shoulder thickness directly affected bending moment capacity of joint. The highest bending moment capacity was obtained in joints with 1.5mm shoulder thickness. As loose tenon length and width were increased, the strength of the joint was correspondingly improved. Test joints with loose tenon made of beech wood gave higher bending moment capacity than joints with loose tenon constructed with other wood species.