The Window,observation, cataloged under National Stock Number 9340-00-684-0873, is classified within Federal Supply Class 9340 (Glass Fabricated Materials) of the Nonmetallic Fabricated Materials group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 10 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 9340-00-684-0873 |
| Primary Part Number | 1870403 |
| Item Name | Window,observation |
| FSC / FSG | 9340 / 93 — Glass Fabricated Materials |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Overall Diameter | 2.617 INCHES MINIMUM AND 2.620 INCHES MAXIMUM IN |
| Surface Finish | POLISHED |
| Overall Thickness | 0.250 INCHES NOMINAL IN |
| Material Transparency | CLEAR |
| Style Designator | CIRCULAR |
| Material Document and Classification | DD-G-451 FED SPEC SINGLE MATERIAL RESPONSE |
| Edge Type | FLAT FINISH |
| Ply Quantity | 1 |
| Environmental Protection | SHATTER PROOF |
| Material | GLASS SAFETY |
| 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 |
|---|---|
| 1870403 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 1870403 | 3/9 Design control — primary reference Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
NSN 9340-00-684-0873 is a Window,observation, manufactured by Naval Sea Systems Command, classified under FSC 9340, Glass Fabricated Materials. Status: active.
NSN 9340-00-684-0873 has 1 manufacturer part number on file: 1870403 (Naval Sea Systems Command).
Key specifications for 1870403: Overall Diameter: 2.617 INCHES MINIMUM AND 2.620 INCHES MAXIMUM IN; Surface Finish: POLISHED; Overall Thickness: 0.250 INCHES NOMINAL IN; Material Transparency: CLEAR. 10 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.