Click on link below for Amada Brochure with specifications: https://www.amada.com/america/brochures/general-fabrication/ID40IV-HP-
NT/html5/index.html?&locale=ENG.
Used for mounting a BT series chuck onto a drawtube, this connector is supplied blank to be machined out to the required thread. **Some machine setups may require the use of extended connectors as well as a drawnut**