Quick Change
The tooling is referred to as Quick Change; National Machine Tool Builders' Association, 1927; NMTB; American Standard Machine Taper, ANSI B5.18; DIN 2080 / IS 2340; ISO R 290-2583. There are slight variations in threads and flanges (JIS B 6339: MAS 403); and the European standards (e.g., ISO taper) use metric draw threads.