40 Series aluminium profile usually applies to assembling a variety of lightweight structural frameworks, such as instrument racks, display boards, engine covers, etc. in the machinery industry. 4040 aluminum extrusions have a simple and elegant appearance and are often matched with hexagon socket M6 bolts and T-nuts. If needs to bear high strength, please use M6 bolt to connect with the sliding nut so that the framework is much stronger and more reliable. All t-slot 40x40 aluminium profiles can freely connect with each other.