The Window,optical Instrument, cataloged under National Stock Number 6650-00-005-2104, is classified within Federal Supply Class 6650 (Optical Instruments, Test Equipment, Components and Accessories) of the Instruments and Laboratory Equipment group. The manufacturer of record is Northrop Grumman Corp Electronic Systems Defensive System Div. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6650-00-005-2104 |
| Primary Part Number | 301391 |
| Item Name | Window,optical Instrument |
| FSC / FSG | 6650 / 66 — Optical Instruments, Test Equipment, Components and Accessories |
| Manufacturer | Northrop Grumman Corp Electronic Systems Defensive System Div |
| Status | ACTIVE |
| Surface Finish | POLISHED |
| Diameter | 9.688 INCHES NOMINAL IN |
| Material | QUARTZ LOCATION NOT OTHERWISE SPECIFIED |
| Polished Surface | BOTH |
| Dispersion | 10.0 MILLIMICRONS NOMINAL |
| Thickness | 0.850 INCHES NOMINAL IN |
| 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 |
NSN 6650-00-005-2104 is a Window,optical Instrument, manufactured by Northrop Grumman Corp Electronic Systems Defensive System Div, classified under FSC 6650, Optical Instruments, Test Equipment, Components and Accessories. Status: active.
NSN 6650-00-005-2104 has 3 manufacturer part numbers on file: 301391 (Cvi Laser Llc Dba Cvi Optical Components), 301391 (Coherent Aerospace & Defense, Inc.), 301391 (Northrop Grumman Corp Electronic Systems Defensive System Div).
2 possible matches (shared part number, not a government interchangeability claim): 5999-00-390-5598, 1630-01-620-9479. Verify interchangeability with system specifications before substitution.
Key specifications for 301391: Surface Finish: POLISHED; Diameter: 9.688 INCHES NOMINAL IN; Material: QUARTZ LOCATION NOT OTHERWISE SPECIFIED; Polished Surface: BOTH. 6 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 6650-00-005-2104 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.