The Ring,retaining,optical Element, cataloged under National Stock Number 5855-01-259-8376, is classified within Federal Supply Class 5855 (Night Vision Equipment, Emitted and Reflected Radiation) of the Communication, Detection, and Coherent Radiation Equipment group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5855-01-259-8376 |
| Item Name | Ring,retaining,optical Element |
| FSC / FSG | 5855 / 58 — Night Vision Equipment, Emitted and Reflected Radiation |
| Status | ACTIVE |
| Internal Flange Thickness | 0.025 INCHES NOMINAL IN |
| Outside Diameter | 2.252 INCHES MINIMUM AND 2.262 INCHES MAXIMUM IN |
| Aperture Diameter | 1.550 INCHES NOMINAL IN |
| Mounting Configuration | FOUR 0.125 IN. DIA. UNTHREADED HOLES IN |
| Material | STEEL COMP 303 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 2001687-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5855-01-259-8376 is a Ring,retaining,optical Element, classified under FSC 5855, Night Vision Equipment, Emitted and Reflected Radiation. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 1265-01-406-9806. Verify interchangeability with system specifications before substitution.
Key specifications for 5855-01-259-8376: Internal Flange Thickness: 0.025 INCHES NOMINAL IN; Outside Diameter: 2.252 INCHES MINIMUM AND 2.262 INCHES MAXIMUM IN; Aperture Diameter: 1.550 INCHES NOMINAL IN; Mounting Configuration: FOUR 0.125 IN. DIA. UNTHREADED HOLES IN. 5 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 5855-01-259-8376 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.