The name used for a stitch that is formed with a needle and bobbin thread. The needle thread is interlocked with the bobbin thread to form a stitch. Also referred to as ISO4915, stitch number 301. On apparel sewing applications other than embroidery, a well-balanced lockstitch will use the same amount of needle thread as bobbin thread. On embroidery applications, this is not true because you never want to see the bobbin thread on the topside of the sewn product. Therefore the needle thread is held on the underneath side by the bobbin thread.