The Crystal Unit,quartz, cataloged under National Stock Number 5955-01-021-1138, is classified within Federal Supply Class 5955 (Oscillators and Piezoelectric Crystals) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Lockheed Martin Corporation Div Rms. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5955-01-021-1138 |
| Primary Part Number | 77C706786-51 |
| Item Name | Crystal Unit,quartz |
| FSC / FSG | 5955 / 59 — Oscillators and Piezoelectric Crystals |
| Manufacturer | Lockheed Martin Corporation Div Rms |
| Status | ACTIVE |
| Frequency Tolerance for Operating Temp in Percent | -0.005 TO 0.005 |
| Terminal Diameter | 0.048 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN |
| Terminal Length | 0.248 INCHES MAXIMUM IN |
| Mode of Oscillation | FUNDAMENTAL |
| Body Width | 0.725 INCHES MAXIMUM IN |
| Equivalent Resistance Value in Ohms | 100000.0 MAXIMUM |
| Overall Thickness | 0.352 INCHES MAXIMUM IN |
| Style Designator | OVAL BODY, PIN TERMINALS |
| Drive Level Rating | 0.1 MILLIWATTS MAXIMUM |
| Body Length | 2.531 INCHES MAXIMUM IN |
| Center to Center Distance Between Terminals | 0.478 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN |
| Circuit Resonance | SERIES RESONANCE |
| Shunt Capacitance in Picofarads | 30.0 MAXIMUM |
| Operating Temp Range | +0.0 TO 65.0 CELSIUS DEGC |
| Specified Frequency | 12.850 KILOHERTZ |
| Body Thickness | 0.317 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 77C706786-51 PRIMARY | Lockheed Martin Corporation Div Rms (USA) |
| 96-109-51 | Microsemi Corp. - High Performance Timing Dba Vectron International- Cancelled (USA) |
| Reference | Meaning |
|---|---|
| 4081600-51 | 5/9 Secondary reference Piezo Crystal Co |
NSN 5955-01-021-1138 is a Crystal Unit,quartz, manufactured by Lockheed Martin Corporation Div Rms, classified under FSC 5955, Oscillators and Piezoelectric Crystals. Status: active.
NSN 5955-01-021-1138 has 2 manufacturer part numbers on file: 77C706786-51 (Lockheed Martin Corporation Div Rms), 96-109-51 (Microsemi Corp. - High Performance Timing Dba Vectron International- Cancelled).
Key specifications for 77C706786-51: Frequency Tolerance for Operating Temp in Percent: -0.005 TO 0.005; Terminal Diameter: 0.048 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN; Terminal Length: 0.248 INCHES MAXIMUM IN; Mode of Oscillation: FUNDAMENTAL. 16 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.