The Crystal Unit,quartz, cataloged under National Stock Number 5955-01-315-9899, is classified within Federal Supply Class 5955 (Oscillators and Piezoelectric Crystals) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5955-01-315-9899 |
| Primary Part Number | 1691AS264 |
| Item Name | Crystal Unit,quartz |
| FSC / FSG | 5955 / 59 — Oscillators and Piezoelectric Crystals |
| Manufacturer | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| Status | ACTIVE |
| Frequency Tolerance for Operating Temp in Percent | -0.002 TO 0.002 |
| Terminal Diameter | 0.017 INCHES NOMINAL IN |
| Terminal Length | 1.500 INCHES MINIMUM IN |
| Mode of Oscillation | FUNDAMENTAL |
| Body Width | 0.402 INCHES MAXIMUM IN |
| Equivalent Resistance Value in Ohms | 30.0 NOMINAL |
| Overall Thickness | 0.183 INCHES MAXIMUM IN |
| Style Designator | OVAL BODY, WIRE LEADS |
| Drive Level Rating | 2.0 MILLIWATTS NOMINAL |
| Center to Center Distance Between Terminals | 0.192 INCHES NOMINAL IN |
| Load Capacitance in Picofarads | 20.0 NOMINAL |
| Circuit Resonance | ANTIRESONANCE |
| Shunt Capacitance in Picofarads | 7.0 NOMINAL |
| Operating Temp Range | -55.0 TO 105.0 CELSIUS DEGC |
| Specified Frequency | 6.000 MEGAHERTZ |
| Body Thickness | 0.150 INCHES MAXIMUM IN |
| 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 |
|---|---|
| 1691AS264 PRIMARY | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| U18-20-60 | C/1 Advisory reference — outside the item-of-supply concept Foremost Machinery Corp |
| U18-20-60 | 5/9 Secondary reference United States Crystal Corp |
NSN 5955-01-315-9899 is a Crystal Unit,quartz, manufactured by Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier, classified under FSC 5955, Oscillators and Piezoelectric Crystals. Status: active.
NSN 5955-01-315-9899 has 1 manufacturer part number on file: 1691AS264 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier).
Key specifications for 1691AS264: Frequency Tolerance for Operating Temp in Percent: -0.002 TO 0.002; Terminal Diameter: 0.017 INCHES NOMINAL IN; Terminal Length: 1.500 INCHES MINIMUM 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.
NSN 5955-01-315-9899 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.