Home › Blog › Buying Guide › Before You Buy: Essential Criteria for Evaluating a Used, Second-Hand, Pre-Owned, Surplus HAAS ST 20 SSY CNC Turning Center C-Axis Live Tooling Y-Axis made in USA If you are considering buying a HAAS ST-20 SSY (or ST-20 SSY / ST-20 Y / Live Tooling / C-Axis) CNC turning center (made in USA) as a used / surplus machine, here is a carefully tailored checklist of what to inspect, test, and document to protect your interests and avoid surprises....