The Crystal Unit,quartz, cataloged under National Stock Number 5955-01-232-1566, is classified within Federal Supply Class 5955 (Oscillators and Piezoelectric Crystals) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Ultra Electronics Maritime Systems Inc Div Subsidiary of Ultra Electronics Holdings Limited. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
| Item Name | Crystal Unit,quartz |
| FSC / FSG | 5955 — Oscillators and Piezoelectric Crystals (FSG 59) |
| Manufacturers | Ultra Electronics Maritime Systems Inc Div Subsidiary of Ultra Electronics Holdings Limited (CAGE 36180); Wenzel International Inc Div Croven Crystals (CAGE 00809) |
| Parameter | Value |
|---|---|
| NSN | 5955-01-232-1566 |
| Primary Part Number | 025-597-020-004 |
| Item Name | Crystal Unit,quartz |
| FSC / FSG | 5955 / 59 — Oscillators and Piezoelectric Crystals |
| Manufacturer | Ultra Electronics Maritime Systems Inc Div Subsidiary of Ultra Electronics Holdings Limited |
| Status | ACTIVE |
| 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 |
|---|---|
| 025-597-020-004 | Ultra Electronics Maritime Systems Inc Div Subsidiary of Ultra Electronics Holdings Limited (CAN) |
| SM-B-597020-4 | Wenzel International Inc Div Croven Crystals (CAN) |
| Reference | Meaning |
|---|---|
| SM-B-597020-4 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5955-01-232-1566 is a Crystal Unit,quartz, manufactured by Ultra Electronics Maritime Systems Inc Div Subsidiary of Ultra Electronics Holdings Limited, classified under FSC 5955, Oscillators and Piezoelectric Crystals. Status: active.
NSN 5955-01-232-1566 has 2 manufacturer part numbers on file: 025-597-020-004 (Ultra Electronics Maritime Systems Inc Div Subsidiary of Ultra Electronics Holdings Limited), SM-B-597020-4 (Wenzel International Inc Div Croven Crystals).
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.