APPARATUS FOR MAKING EXTERNALLY THREADED FASTENER OR ARTICLE,E.G., SCREW, BOLT ETC.:
(under the class definition) Subject matter for apparatus for manufacturing a securing device or element having an external helical ridge.
SEE OR SEARCH CLASS
29, Metal Working, for machines capable of manufacturing machine screws but additionally capable of forming other similar parts or articles such as binding posts, spoke nipples, etc., particularly