The Crystal Unit,quartz, cataloged under National Stock Number 5955-01-021-7779, is classified within Federal Supply Class 5955 (Oscillators and Piezoelectric Crystals) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Bliley Technologies Inc. Government technical data includes 14 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5955-01-021-7779 |
| Primary Part Number | K378-5C |
| Item Name | Crystal Unit,quartz |
| FSC / FSG | 5955 / 59 — Oscillators and Piezoelectric Crystals |
| Manufacturer | Bliley Technologies Inc |
| Status | ACTIVE |
| Frequency Tolerance for Operating Temp in Percent | -0.002 TO 0.002 |
| Terminal Diameter | 0.016 INCHES MINIMUM AND 0.019 INCHES MAXIMUM IN |
| Overall Diameter | 0.350 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN |
| Terminal Length | 1.500 INCHES MINIMUM IN |
| Mode of Oscillation | FIFTH OVERTONE |
| Equivalent Resistance Value in Ohms | 55.0 MAXIMUM |
| Style Designator | HAT TYPE, 3 WIRE LEADS |
| Diameter | 0.310 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN |
| Drive Level Rating | 0.3 MILLIWATTS MINIMUM AND 0.5 MILLIWATTS MAXIMUM |
| Center to Center Distance Between Terminals | 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN |
| Circuit Resonance | SERIES RESONANCE |
| Shunt Capacitance in Picofarads | 4.8 MAXIMUM |
| Operating Temp Range | +0.0 TO 40.0 CELSIUS DEGC |
| Specified Frequency | 105.73452 MEGAHERTZ |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| K378-5C | Bliley Technologies Inc (USA) |
| 99-261-5C | Microsemi Corp. - High Performance Timing Dba Vectron International- Cancelled (USA) |
| Reference | Meaning |
|---|---|
| 945042-5C | 3/2 Design control — primary reference U.S. Government activity |
| C15873-5C | 5/2 Secondary reference U.S. Government activity |
NSN 5955-01-021-7779 is a Crystal Unit,quartz, manufactured by Bliley Technologies Inc, classified under FSC 5955, Oscillators and Piezoelectric Crystals. Status: active.
NSN 5955-01-021-7779 has 2 manufacturer part numbers on file: K378-5C (Bliley Technologies Inc), 99-261-5C (Microsemi Corp. - High Performance Timing Dba Vectron International- Cancelled).
Key specifications for K378-5C: Frequency Tolerance for Operating Temp in Percent: -0.002 TO 0.002; Terminal Diameter: 0.016 INCHES MINIMUM AND 0.019 INCHES MAXIMUM IN; Overall Diameter: 0.350 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN; Terminal Length: 1.500 INCHES MINIMUM IN. 14 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 5955-01-021-7779 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.