What component ensures that all contacts in a connector align properly?

The component that ensures all contacts in a connector align properly is the keyways. Keyways are specifically designed features in connectors that provide a physical guide for the correct orientation and alignment of the parts being connected. They prevent misalignment or incorrect insertion by allowing only one specific position in which the connector can be joined together. This is crucial for maintaining the integrity of the connection and ensuring proper electrical performance.

Other components, such as fasteners, insulators, and casings, play important roles in the functionality and safety of connectors but do not primarily serve the purpose of aligning contacts. Fasteners hold the connector in place, insulators prevent electrical shorts and ensure safety, and casings protect the internal components from environmental factors, but none provide the precise alignment functionality that keyways do.