The Window,observation, cataloged under National Stock Number 9330-01-254-2978, is classified within Federal Supply Class 9330 (Plastics Fabricated Materials) of the Nonmetallic Fabricated Materials group. The manufacturer of record is Optical Coating Laboratory, Llc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 9330-01-254-2978 |
| Primary Part Number | 4500170 |
| Item Name | Window,observation |
| FSC / FSG | 9330 / 93 — Plastics Fabricated Materials |
| Manufacturer | Optical Coating Laboratory, Llc |
| Status | ACTIVE |
| Criticality Code Justification | FEAT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 4500170 PRIMARY | Optical Coating Laboratory, Llc (USA) |
| Reference | Meaning |
|---|---|
| 40A30031-1 | 5/9 Secondary reference Hughes Missile Systems Co San Diego |
| 15-39500-1 | 5/9 Secondary reference Hughes Missile Systems Co San Diego |
NSN 9330-01-254-2978 is a Window,observation, manufactured by Optical Coating Laboratory, Llc, classified under FSC 9330, Plastics Fabricated Materials. Status: active.
NSN 9330-01-254-2978 has 1 manufacturer part number on file: 4500170 (Optical Coating Laboratory, Llc).
1 possible match (shared part number, not a government interchangeability claim): 5120-01-576-9752. Verify interchangeability with system specifications before substitution.
Key specifications for 4500170: Criticality Code Justification: FEAT; Special Features: HARDNESS CRITICAL ITEM; End Item Identification: PACER SPECIAL. 1 specification is documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 9330-01-254-2978 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.