| Drehmomentschlüssel | torque wrench |
| Bratschenschlüssel | alto clef |
| Fremdschlüssel | foreign key |
| Notenschlüssel | clef |
| Zimmerschlüssel | room key |
| Drehmomentwandler | torque converter |
| Zusammenschluss | fusion merger pool union |
| entschlüsseln | decipher decode decrypt |
| Hauptschlüssel | master key |
| Surrogatschlüssel | surrogate key |
| Zweitschlüssel | spare key |
| Drogenschmuggel | drug trafficking |
| Primärschlüssel | primary key |
| Tenorschlüssel | tenor clef |
| Violinschlüssel | G clef |
| privater Schlüssel | private key |
| Datenbankschlüssel | database key |
| Kreuzschlüssel | wheel brace |
| Schraubenschlüssel | wrench screw-wrench |
| Drehmoment | torque |