The Ring,retaining,optical Element, cataloged under National Stock Number 5855-01-165-2177, 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 Md3 Industries, Limited Div Md3 Industries, Ltd.. Government technical data includes 6 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5855-01-165-2177 |
| Primary Part Number | SM-D-850408 |
| Item Name | Ring,retaining,optical Element |
| FSC / FSG | 5855 / 58 — Night Vision Equipment, Emitted and Reflected Radiation |
| Manufacturer | Md3 Industries, Limited Div Md3 Industries, Ltd. |
| Status | ACTIVE |
| FSC Application Data | NIGHT VISION EQUIPMENT,EMITTED AND REFLECTED RADIATION |
| Internal Flange Thickness | 0.125 INCHES NOMINAL IN |
| Outside Diameter | 2.060 INCHES NOMINAL IN |
| Thread Location | INTERNAL |
| Aperture Diameter | 1.840 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY 6061 |
| 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 |
|---|---|
| SM-D-850408 | Md3 Industries, Limited Div Md3 Industries, Ltd. (USA) |
| Reference | Meaning |
|---|---|
| SM-D-850408 | 5/9 Secondary reference L3 Technologies, Inc. Dba Insight Technology Division Div Insight Technology Division |
| SM-D-850408 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5855-01-165-2177 is a Ring,retaining,optical Element, manufactured by Md3 Industries, Limited Div Md3 Industries, Ltd., classified under FSC 5855, Night Vision Equipment, Emitted and Reflected Radiation. Status: active.
NSN 5855-01-165-2177 has 1 manufacturer part number on file: SM-D-850408 (Md3 Industries, Limited Div Md3 Industries, Ltd.).
Key specifications for SM-D-850408: FSC Application Data: NIGHT VISION EQUIPMENT,EMITTED AND REFLECTED RADIATION; Internal Flange Thickness: 0.125 INCHES NOMINAL IN; Outside Diameter: 2.060 INCHES NOMINAL IN; Thread Location: INTERNAL. 6 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 5855-01-165-2177 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.