The Ring,retaining,optical Element, cataloged under National Stock Number 5855-01-261-4677, is classified within Federal Supply Class 5855 (Night Vision Equipment, Emitted and Reflected Radiation) of the Communication, Detection, and Coherent Radiation Equipment group. The manufacturer of record is Dept of the Army U S Army Electronics Command Night Vision Laboratory. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5855-01-261-4677 |
| Primary Part Number | 5005839 |
| Item Name | Ring,retaining,optical Element |
| FSC / FSG | 5855 / 58 — Night Vision Equipment, Emitted and Reflected Radiation |
| Manufacturer | Dept of the Army U S Army Electronics Command Night Vision Laboratory |
| Status | ACTIVE |
| Outside Diameter | 1.536 INCHES NOMINAL IN |
| Thread Location | INTERNAL |
| 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 |
|---|---|
| 5005839 | Alek Industries Inc (USA) |
| 5005839 PRIMARY | Dept of the Army U S Army Electronics Command Night Vision Laboratory (USA) |
| 5005839 | Koehlke Components Inc (USA) |
| Reference | Meaning |
|---|---|
| 5005839.01 | 5/9 Secondary reference Whitcomb Corrine a |
| 5005839 | 5/9 Secondary reference Bell and Howell Phillipsburg Co Corporate Offices |
NSN 5855-01-261-4677 is a Ring,retaining,optical Element, manufactured by Dept of the Army U S Army Electronics Command Night Vision Laboratory, classified under FSC 5855, Night Vision Equipment, Emitted and Reflected Radiation. Status: active.
NSN 5855-01-261-4677 has 3 manufacturer part numbers on file: 5005839 (Alek Industries Inc), 5005839 (Dept of the Army U S Army Electronics Command Night Vision Laboratory), 5005839 (Koehlke Components Inc).
Key specifications for 5005839: Outside Diameter: 1.536 INCHES NOMINAL IN; Thread Location: INTERNAL. 2 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 5855-01-261-4677 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.