The Flat Key (OEM Part No. Q5280310) is a mechanical spare part designed to transmit torque and maintain accurate positioning between compatible shafts and hubs. Manufactured from durable carbon steel, the flat key provides a secure mechanical connection by fitting into matching keyways and helping prevent relative rotation between assembled components. The Q5280310 flat key is designed to withstand mechanical loads, vibration, and repeated operating conditions commonly found in mining and heavy-duty equipment. It is suitable for maintenance, repair, and replacement applications involving worn or damaged shaft and hub components. This aftermarket replacement flat key provides a practical solution for restoring reliable torque transmission and maintaining proper mechanical assembly.