The Ring,retaining,optical Element, cataloged under National Stock Number 5855-01-039-2856, 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 13 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5855-01-039-2856 |
| Item Name | Ring,retaining,optical Element |
| FSC / FSG | 5855 / 58 — Night Vision Equipment, Emitted and Reflected Radiation |
| Status | ACTIVE |
| FSC Application Data | NIGHT VISION EQUIPMENT |
| Internal Flange Thickness | 0.049 INCHES NOMINAL IN |
| Thread Pitch Diameters | +3.1389 TO 3.1459 INCHES IN |
| Outside Diameter | 3.270 INCHES NOMINAL IN |
| Thread Length | 0.480 INCHES IN |
| Thread Location | INTERNAL |
| Aperture Diameter | 2.670 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Thread Size | 7/40-18 |
| Screw Thread Series Designator | UNS |
| Mounting Configuration | 0.086 IN. DIA HOLE 1 IN |
| Thread Class | 2B |
| Material | ALUMINUM ALLOY 6061 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| SM-D-850425 | 3/2 Design control — primary reference U.S. Government activity |
| SM-D-850425 | 5/9 Secondary reference Colonial Mfg Co Inc |
| SM-D-850425 | 5/9 Secondary reference Starlight Components Inc |
NSN 5855-01-039-2856 is a Ring,retaining,optical Element, classified under FSC 5855, Night Vision Equipment, Emitted and Reflected Radiation. Status: active.
Key specifications for 5855-01-039-2856: FSC Application Data: NIGHT VISION EQUIPMENT; Internal Flange Thickness: 0.049 INCHES NOMINAL IN; Thread Pitch Diameters: +3.1389 TO 3.1459 INCHES IN; Overall Length: 0.959 INCHES NOMINAL IN. 13 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 5855-01-039-2856 has DEMIL Code Q. 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.