The Ring,retaining,optical Element, cataloged under National Stock Number 5855-01-045-5497, 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 Bright Lights Usa, Inc Dba Blusa Defense Manufacturing. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5855-01-045-5497 |
| Primary Part Number | SM-D-850133 |
| Item Name | Ring,retaining,optical Element |
| FSC / FSG | 5855 / 58 — Night Vision Equipment, Emitted and Reflected Radiation |
| Manufacturer | Bright Lights Usa, Inc Dba Blusa Defense Manufacturing |
| Status | ACTIVE |
| FSC Application Data | NIGHT VISION EQUIPMENT,EMITTED AND REFLECTED RADIATION |
| Thread Pitch Diameters | +5.4735 TO 5.4783 INCHES IN |
| Outside Diameter | 5.640 INCHES NOMINAL IN |
| Thread Length | 0.305 INCHES IN |
| Thread Location | EXTERNAL |
| Thread Size | 5 1/2-32 |
| Screw Thread Series Designator | UNS |
| Mounting Configuration | 0.125 IN. DIA HOLES 3 IN |
| Thread Class | 2A A |
| 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-850133 | Bright Lights Usa, Inc Dba Blusa Defense Manufacturing (USA) |
| A11083 | Autodyne Manufacturing Co Inc (USA) |
| Reference | Meaning |
|---|---|
| SM-D-850133 | 5/9 Secondary reference L3 Technologies, Inc. Dba Insight Technology Division Div Insight Technology Division |
| SM-D-850133 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5855-01-045-5497 is a Ring,retaining,optical Element, manufactured by Bright Lights Usa, Inc Dba Blusa Defense Manufacturing, classified under FSC 5855, Night Vision Equipment, Emitted and Reflected Radiation. Status: active.
NSN 5855-01-045-5497 has 2 manufacturer part numbers on file: SM-D-850133 (Bright Lights Usa, Inc Dba Blusa Defense Manufacturing), A11083 (Autodyne Manufacturing Co Inc).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-500-2796. Verify interchangeability with system specifications before substitution.
Key specifications for SM-D-850133: FSC Application Data: NIGHT VISION EQUIPMENT,EMITTED AND REFLECTED RADIATION; Thread Pitch Diameters: +5.4735 TO 5.4783 INCHES IN; Overall Length: 0.750 INCHES NOMINAL IN; Outside Diameter: 5.640 INCHES NOMINAL IN. 10 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 5855-01-045-5497 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.