The Window,optical Instrument, cataloged under National Stock Number 1240-00-210-4384, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 11 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. 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 | 1240-00-210-4384 |
| Primary Part Number | 1049116 |
| Item Name | Window,optical Instrument |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| FSC Application Data | OPTICAL SIGHTING AND RANGING EQUIPMENT |
| Surface Finish | POLISHED |
| Material Document and Classification | JAN-G-174, GRADE B MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Diameter | 46.6 MILLIMETERS MINIMUM AND 47.0 MILLIMETERS MAXIMUM MM |
| Reflection Reducing Surface | BOTH |
| Polished Periphery | NOT PROVIDED |
| Material | GLASS OPTICAL LOCATION NOT OTHERWISE SPECIFIED |
| Refraction Index | 1.5170 NOMINAL |
| Polished Surface | BOTH |
| Dispersion | 64.5 ANGSTROMS NOMINAL |
| Thickness | 7.6 MILLIMETERS MINIMUM AND 8.0 MILLIMETERS MAXIMUM MM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 1240-00-210-4384 is a Window,optical Instrument, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-00-210-4384 has 2 manufacturer part numbers on file: 1049116 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), MIL1797 (Bausch & Lomb Inc).
1 possible match (shared part number, not a government interchangeability claim): 5999-00-858-1224. Verify interchangeability with system specifications before substitution.
Key specifications for 1049116: FSC Application Data: OPTICAL SIGHTING AND RANGING EQUIPMENT; Surface Finish: POLISHED; Material Document and Classification: JAN-G-174, GRADE B MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED; Diameter: 46.6 MILLIMETERS MINIMUM AND 47.0 MILLIMETERS MAXIMUM MM. 11 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 1240-00-210-4384 has DEMIL Code D. 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.