The Window,observation, cataloged under National Stock Number 9340-00-837-4367, is classified within Federal Supply Class 9340 (Glass Fabricated Materials) of the Nonmetallic Fabricated Materials group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 4 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 | 9340-00-837-4367 |
| Primary Part Number | 1815501 |
| Item Name | Window,observation |
| FSC / FSG | 9340 / 93 — Glass Fabricated Materials |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Overall Diameter | 2.750 INCHES NOMINAL IN |
| Overall Thickness | 0.188 INCHES NOMINAL IN |
| Material Transparency | CLEAR |
| Style Designator | CIRCULAR |
| Edge Type | FLAT FINISH |
| Ply Quantity | 1 |
| Material | GLASS PLATE |
| 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 |
|---|---|
| 1876433REVHPC34 | Northrop Grumman Systems Corporation (USA) |
| 1815501 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| 1876433REVHPC34 | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| 1815501 | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
NSN 9340-00-837-4367 is a Window,observation, manufactured by Northrop Grumman Systems Corporation, classified under FSC 9340, Glass Fabricated Materials. Status: active.
NSN 9340-00-837-4367 has 4 manufacturer part numbers on file: 1876433REVHPC34 (Northrop Grumman Systems Corporation), 1815501 (Northrop Grumman Systems Corporation), 1876433REVHPC34 (Lockheed Martin Corporation Div Rms - Mitchel Field), 1815501 (Lockheed Martin Corporation Div Rms - Mitchel Field).
1 possible match (shared part number, not a government interchangeability claim): 1660-00-918-0836. Verify interchangeability with system specifications before substitution.
Key specifications for 1815501: Overall Diameter: 2.750 INCHES NOMINAL IN; Overall Thickness: 0.188 INCHES NOMINAL IN; Material Transparency: CLEAR; Style Designator: CIRCULAR. 7 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.