The Crystal Unit,quartz, cataloged under National Stock Number 5955-00-577-7789, is classified within Federal Supply Class 5955 (Oscillators and Piezoelectric Crystals) of the Electrical and Electronic Equipment Components group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5955-00-577-7789 |
| Item Name | Crystal Unit,quartz |
| FSC / FSG | 5955 / 59 — Oscillators and Piezoelectric Crystals |
| Status | ACTIVE |
| Frequency Tolerance for Operating Temp in Percent | -0.005 TO 0.005 |
| Terminal Diameter | 0.050 INCHES NOMINAL IN |
| Terminal Length | 0.248 INCHES MAXIMUM IN |
| Mode of Oscillation | THIRD OVERTONE |
| Overall Thickness | 0.352 INCHES MAXIMUM IN |
| Style Designator | OVAL BODY, PIN TERMINALS |
| Body Length | 0.775 INCHES MAXIMUM IN |
| Center to Center Distance Between Terminals | 0.486 INCHES NOMINAL IN |
| Operating Temp Range | -55.0 TO 90.0 CELSIUS DEGC |
| Specified Frequency | 34.4494 KILOHERTZ |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| CR51U | 3/1 Design control — primary reference U.S. Government activity |
| MILC3098TYPECR51U | 4/1 Identification reference U.S. Government activity |
NSN 5955-00-577-7789 is a Crystal Unit,quartz, classified under FSC 5955, Oscillators and Piezoelectric Crystals. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 5955-00-577-7791, 5955-00-577-7792, 5955-00-577-7794. Verify interchangeability with system specifications before substitution.
Key specifications for 5955-00-577-7789: Frequency Tolerance for Operating Temp in Percent: -0.005 TO 0.005; Terminal Diameter: 0.050 INCHES NOMINAL IN; Terminal Length: 0.248 INCHES MAXIMUM IN; Mode of Oscillation: THIRD OVERTONE. 10 specifications are documented in the U.S. Government catalog.
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.