The Ring,retaining,optical Element, cataloged under National Stock Number 5855-01-503-5333, 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 Optex Systems, Inc Div Applied Optics Center. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5855-01-503-5333 |
| Primary Part Number | SC00120 |
| Item Name | Ring,retaining,optical Element |
| FSC / FSG | 5855 / 58 — Night Vision Equipment, Emitted and Reflected Radiation |
| Manufacturer | Optex Systems, Inc Div Applied Optics Center |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| SC00120 PRIMARY | Optex Systems, Inc Div Applied Optics Center (USA) |
| Reference | Meaning |
|---|---|
| SC00120 | 5/9 Secondary reference L3 Technologies, Inc. Dba Insight Technology Division Div Insight Technology Division |
NSN 5855-01-503-5333 is a Ring,retaining,optical Element, manufactured by Optex Systems, Inc Div Applied Optics Center, classified under FSC 5855, Night Vision Equipment, Emitted and Reflected Radiation. Status: active.
NSN 5855-01-503-5333 has 1 manufacturer part number on file: SC00120 (Optex Systems, Inc Div Applied Optics Center).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-592-6219. Verify interchangeability with system specifications before substitution.
Key specifications for SC00120: Special Features: INCLUDES PIN, SPRING, P/N MS171436, NSN 5315-00-844-5644 AND RING, OBJECTIVE FOCUS STOP, P/N 188D0022; RING PROTRUDES 0.250 INCHES FROM ONE FACE OF RING; SPRING-PRESS IN PLACE IN; Part Name Assigned by Controlling Agency: RING, OBJECTIVE FOCUS STOP ASSY; End Item Identification: AN/PVS-20, NIGHT VISION SIGHT, CREW SERVED. 0 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.
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.