Description. Morse Taper - to - Threaded Arbors allow the use of threaded - back drill chucks in machines with Morse Taper spindles threaded arbors typically are used in Milling Machine. Straight shank to threaded arbors can be held in other chucks, etc. These products are available in various sizes, shapes and specifications and are generally used in various industrial, commercial as well as residential areas. Our collection is quality tested on various parameters by our quality controllers to ensure that all the products are completely faultless in each and every aspect.