The Crystal Unit,quartz, cataloged under National Stock Number 5955-00-251-2991, is classified within Federal Supply Class 5955 (Oscillators and Piezoelectric Crystals) of the Electrical and Electronic Equipment Components group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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 | 5955-00-251-2991 |
| Item Name | Crystal Unit,quartz |
| FSC / FSG | 5955 / 59 — Oscillators and Piezoelectric Crystals |
| Status | ACTIVE |
| Frequency Tolerance for Operating Temp in Percent | -0.007 TO 0.007 |
| Terminal Diameter | 0.030 INCHES NOMINAL IN |
| Terminal Length | 0.207 INCHES NOMINAL IN |
| Mode of Oscillation | FUNDAMENTAL |
| Body Width | 0.720 INCHES NOMINAL IN |
| Overall Thickness | 0.343 INCHES MAXIMUM IN |
| Style Designator | OVAL BODY, PIN TERMINALS |
| Body Length | 0.570 INCHES NOMINAL IN |
| Center to Center Distance Between Terminals | 0.486 INCHES NOMINAL IN |
| Circuit Resonance | ANTIRESONANCE |
| Operating Temp Range | +50.0 TO 85.0 CELSIUS DEGC |
| Specified Frequency | 5.72222 KILOHERTZ |
| Body Thickness | 0.315 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| MIL-C-16836 | 4/1 Identification reference U.S. Government activity |
| 40161-5722-22KC | 2/2 Government specification standardization U.S. Government activity |
| 40161 | 5/1 Secondary reference U.S. Government activity |
NSN 5955-00-251-2991 is a Crystal Unit,quartz, classified under FSC 5955, Oscillators and Piezoelectric Crystals. Status: active.
6 possible matches (shared part number, not a government interchangeability claim): 5955-00-251-6878, 5955-00-255-2136, 5330-00-842-8225. Verify interchangeability with system specifications before substitution.
Key specifications for 5955-00-251-2991: Frequency Tolerance for Operating Temp in Percent: -0.007 TO 0.007; Terminal Diameter: 0.030 INCHES NOMINAL IN; Terminal Length: 0.207 INCHES NOMINAL IN; Mode of Oscillation: FUNDAMENTAL. 13 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.
NSN 5955-00-251-2991 has DEMIL Code D. Demilitarization may be required before disposal or transfer to non-military entities.
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.