With the Spax chipboard screw 5 x 40 mm, you achieve robust and durable timber connections. Made from A2 stainless steel, it provides dependable corrosion resistance for outdoor projects and damp environments. The t-star plus T20 recess delivers optimal power transfer, keeping your bit firmly seated without slipping during drive-in. Its countersunk head with multikop design pulls flush into the timber surface cleanly without requiring separate pre-countersinking. In addition, the full thread along the entire 40 mm length provides high tensile and compressive strength across your wooden assemblies.