Tips for Stronger Tenons
Make them bigger, reduce gaps, and don’t spare the glue
Wood researcher Dan Bollock broke more than 150 mortise-and-tenon joints of different widths, lengths, and thicknesses to see exactly how size, fit, and glue-up procedures affect the strength of the joint. He found that width plays the biggest role, but that length and thickness also make a huge difference. Not surprisingly, a joint that fits well is stronger. Also, the strongest glue bond was created by applying glue to both the mortise and the tenon.