The Holder,crystal Unit, cataloged under National Stock Number 5955-00-166-0831, is classified within Federal Supply Class 5955 (Oscillators and Piezoelectric Crystals) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Lockheed Martin Corp Electronics and Missiles Div. 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 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 | 5955-00-166-0831 |
| Primary Part Number | 121544-1 |
| Item Name | Holder,crystal Unit |
| FSC / FSG | 5955 / 59 — Oscillators and Piezoelectric Crystals |
| Manufacturer | Lockheed Martin Corp Electronics and Missiles Div |
| Status | ACTIVE |
| Overall Diameter | 0.752 INCHES NOMINAL IN |
| Style Designator | CUP |
| Surface Treatment | CADMIUM |
| Material | ALUMINUM ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 121544-1 PRIMARY | Lockheed Martin Corp Electronics and Missiles Div (USA) |
NSN 5955-00-166-0831 is a Holder,crystal Unit, manufactured by Lockheed Martin Corp Electronics and Missiles Div, classified under FSC 5955, Oscillators and Piezoelectric Crystals. Status: active.
NSN 5955-00-166-0831 has 1 manufacturer part number on file: 121544-1 (Lockheed Martin Corp Electronics and Missiles Div).
1 possible match (shared part number, not a government interchangeability claim): 9905-01-478-4954. Verify interchangeability with system specifications before substitution.
Key specifications for 121544-1: Overall Height: 0.170 INCHES NOMINAL IN; Overall Diameter: 0.752 INCHES NOMINAL IN; Style Designator: CUP; Surface Treatment: CADMIUM. 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.
NSN 5955-00-166-0831 has DEMIL Code B. 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.