The Crystal, cataloged under National Stock Number 5815-01-240-7777, is classified within Federal Supply Class 5815 (Teletype and Facsimile Equipment) of the Communication, Detection, and Coherent Radiation Equipment group. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Crystal |
| FSC / FSG | 5815 — Teletype and Facsimile Equipment (FSG 58) |
| Parameter | Value |
|---|---|
| NSN | 5815-01-240-7777 |
| Item Name | Crystal |
| FSC / FSG | 5815 / 58 — Teletype and Facsimile Equipment |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Reference | Meaning |
|---|---|
| 2354-2 | 5/9 Secondary reference Transtel Communications Ltd |
| 2354-2 | 3/9 Design control — primary reference Extel Corp |
NSN 5815-01-240-7777 is a Crystal, classified under FSC 5815, Teletype and Facsimile Equipment. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5940-01-665-5288, 2520-01-667-7546. Verify interchangeability with system specifications before substitution.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.