| Generalschlüssel | master key passe-partout passkey |
| Zentralschlüssel | master key |
| Gabelschlüssel | open end spanner |
| Tenorschlüssel | tenor clef |
| Generalklausel | comprehensive clause |
| Meeranschluss | access to the sea |
| Gegenschluss | converse |
| Maulschlüssel | open end spanner |
| Altschlüssel | alto clef |
| Fremdschlüssel | foreign key |
| Funkschlüssel | fob |
| Primärschlüssel | primary key |
| verschlüsselt | encrypted |
| Inbusschlüssel | Allen wrench |
| Kreuzschlüssel | wheel brace |
| Notenschlüssel | clef |
| Türschlüssel | door key |
| Zimmerschlüssel | room key |
| Zweitschlüssel | spare key |
| Zündschlüssel | ignition key |