The Crystal Unit,quartz, cataloged under National Stock Number 5955-01-021-4659, is classified within Federal Supply Class 5955 (Oscillators and Piezoelectric Crystals) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Northrop Grumman Support Services Corp. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5955-01-021-4659 |
| Primary Part Number | 128C850H01 |
| Item Name | Crystal Unit,quartz |
| FSC / FSG | 5955 / 59 — Oscillators and Piezoelectric Crystals |
| Manufacturer | Northrop Grumman Support Services Corp |
| Status | ACTIVE |
| Distance Between Center Terminal and Outside Terminal Centers | 0.100 INCHES NOMINAL IN |
| Frequency Tolerance for Operating Temp in Percent | -0.001 TO 0.001 |
| Terminal Diameter | 0.028 INCHES MINIMUM AND 0.032 INCHES MAXIMUM IN |
| Second Center to Center Distance Between Terminals | 0.200 INCHES NOMINAL IN |
| Overall Diameter | 0.560 INCHES MAXIMUM IN |
| Terminal Length | 0.250 INCHES MINIMUM IN |
| Mode of Oscillation | FUNDAMENTAL |
| Equivalent Resistance Value in Ohms | 15.0 MAXIMUM |
| Style Designator | HAT TYPE, 5 WIRE LEADS |
| Diameter | 0.500 INCHES NOMINAL IN |
| Drive Level Rating | 500.0 MICROAMPERES MAXIMUM |
| Center to Center Distance Between Terminals | 0.200 INCHES NOMINAL IN |
| Circuit Resonance | SERIES RESONANCE |
| Shunt Capacitance in Picofarads | 3.5 MAXIMUM |
| Operating Temp Range | -10.0 TO 60.0 CELSIUS DEGC |
| Specified Frequency | 29.998 MEGAHERTZ |
| 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 |
|---|---|
| 128C850H01 | Microsemi Corp. - High Performance Timing Dba Vectron International- Cancelled (USA) |
| 128C850H01 PRIMARY | Northrop Grumman Support Services Corp (USA) |
| 2183009 | Microsemi Corp. - High Performance Timing Dba Vectron International- Cancelled (USA) |
| Reference | Meaning |
|---|---|
| 2183009 | C/1 Advisory reference — outside the item-of-supply concept General Indicator Corp Standard Winding Div |
| 128C850H01 | 3/9 Design control — primary reference U.S. Government activity |
| 2183009 | 5/9 Secondary reference Piezo Crystal Co |
NSN 5955-01-021-4659 is a Crystal Unit,quartz, manufactured by Northrop Grumman Support Services Corp, classified under FSC 5955, Oscillators and Piezoelectric Crystals. Status: active.
NSN 5955-01-021-4659 has 3 manufacturer part numbers on file: 128C850H01 (Microsemi Corp. - High Performance Timing Dba Vectron International- Cancelled), 128C850H01 (Northrop Grumman Support Services Corp), 2183009 (Microsemi Corp. - High Performance Timing Dba Vectron International- Cancelled).
Key specifications for 128C850H01: Distance Between Center Terminal and Outside Terminal Centers: 0.100 INCHES NOMINAL IN; Frequency Tolerance for Operating Temp in Percent: -0.001 TO 0.001; Terminal Diameter: 0.028 INCHES MINIMUM AND 0.032 INCHES MAXIMUM IN; Second Center to Center Distance Between Terminals: 0.200 INCHES NOMINAL IN. 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.