With the Spax chipboard screw 3.5 x 40 mm, you achieve strong and dependable timber joints in all your interior projects. The t-star plus T20 drive ensures an exact bit fit without slipping or cam-out, giving you full control during driving. Its full thread delivers high pull-out resistance and a secure hold in materials like chipboard and MDF. The countersunk multihead cleanly countersinks flush into wood for a smooth, professional finish. In addition, the advanced wirox coating provides significantly higher corrosion resistance than standard zinc plating, making it an excellent choice for furniture assembly, stud framing, and dry interior construction.