| EIA ELECTRON TUBE ENVELOPE ACCOMMODATED | ST 12 |
| ACCOMMODATED ITEM SECURING DEVICE TYPE | FRICTION FASTENER |
| DISTANCE BETWEEN MOUNTING FACILITY CENTERS | 2.625 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP |
| OVERALL HEIGHT | 3.375 INCHES NOMINAL |
| OVERALL LENGTH | 3.250 INCHES NOMINAL |
| OVERALL WIDTH | 1.250 INCHES NOMINAL |
| MATERIAL | STEEL |
| MOUNTING FACILITY TYPE AND QUANTITY | 2 THREADED HOLE(S) SINGLE MOUNTING FACILITY |
| NOMINAL THREAD SIZE | 0.164 INCHES SINGLE MOUNTING FACILITY |
| STYLE DESIGNATOR | SPRING LOCK DUAL PILLAR HOLD DOWN |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) SINGLE MOUNTING FACILITY |