The Crystal Unit,quartz, cataloged under National Stock Number 5955-01-077-3220, is classified within Federal Supply Class 5955 (Oscillators and Piezoelectric Crystals) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Compaq Federal Llc. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5955-01-077-3220 |
| Primary Part Number | 18-11689-00 |
| Item Name | Crystal Unit,quartz |
| FSC / FSG | 5955 / 59 — Oscillators and Piezoelectric Crystals |
| Manufacturer | Compaq Federal Llc |
| Status | ACTIVE |
| Terminal Length | 0.500 INCHES NOMINAL IN |
| Overall Thickness | 0.345 INCHES NOMINAL IN |
| Style Designator | OVAL BODY, WIRE LEADS W/HOLD DOWN WIRE |
| Specified Frequency | 1.6896 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 |
|---|---|
| 18-11689-00 PRIMARY | Compaq Federal Llc (USA) |
| Reference | Meaning |
|---|---|
| 1811689 | 5/9 Secondary reference Compaq Federal Llc |
NSN 5955-01-077-3220 is a Crystal Unit,quartz, manufactured by Compaq Federal Llc, classified under FSC 5955, Oscillators and Piezoelectric Crystals. Status: active.
NSN 5955-01-077-3220 has 1 manufacturer part number on file: 18-11689-00 (Compaq Federal Llc).
1 possible match (shared part number, not a government interchangeability claim): 5935-01-302-6458. Verify interchangeability with system specifications before substitution.
Key specifications for 18-11689-00: Terminal Length: 0.500 INCHES NOMINAL IN; Overall Thickness: 0.345 INCHES NOMINAL IN; Style Designator: OVAL BODY, WIRE LEADS W/HOLD DOWN WIRE; Overall Length: 0.767 INCHES NOMINAL IN. 4 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.