| Abbreviation | Definition |
|---|---|
| QCB | Qualtek Circuit Breaker |
| QCD | Quality Color Design |
| QCH | Qmark Ceiling Heater |
| QCH | Quick Change Head |
| QCH | Quick Connect Heavy-duty blades |
| QCO | Quick Change Over |
| QCP | Qualcomm Cellular Phone |
| QCP | Quick Crete Products |
| QD | Quartz Date |
| QD | Quick Detach |
| QD | Quick Detachable |
| QD | Quickly Discontinued |
| QDC | Quick Disconnect Coupler |
| QDH | Quick Disconnect Hose |
| QDO | Quiick Dip Oven |
| QDP | Quality Data Products |
| QF | Questioned Fiber |
| QFB | Q-Freedom Bridge |
| QFB | QuinStar Filter, Bandpass |
| QFC | Quality Factory Crimped connection |