Buy 40mm x 40mm box section from the UK’s leading online metal supplier. At metals4U, we are proud to offer the best quality and service to tradespeople and contractors across the country. You can find all the specifications of this 40mm x 40mm box section below, detailing the grade, finish, formability, weldability and more. Our 40mm x 40mm x 2mm mild steel box section is available in 3m or 6m, or you can take advantage of free custom cutting for more specific requirements. You can expect same-day dispatch and fast delivery with our 40mm x 40mm box section, so if you need a job done quickly, you can count on metals4U.