The Window,observation, cataloged under National Stock Number 9330-01-042-2004, is classified within Federal Supply Class 9330 (Plastics Fabricated Materials) of the Nonmetallic Fabricated Materials group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 11 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 9330-01-042-2004 |
| Primary Part Number | A51B16179-11 |
| Item Name | Window,observation |
| FSC / FSG | 9330 / 93 — Plastics Fabricated Materials |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Insulating Air Space Material Arrangement | PLASTIC TO PLASTIC |
| Overall Diameter | 1.200 INCHES NOMINAL IN |
| Surface Finish | FINE FINISHED |
| Overall Thickness | 0.187 INCHES NOMINAL IN |
| Material Transparency | CLEAR |
| Style Designator | CIRCULAR |
| Material Document and Classification | G-4104AHA FSCM 26512 MFR REF SINGLE MATERIAL RESPONSE |
| Ply Quantity | 1 |
| Color | WHITE, OPAL |
| Material | PLASTIC |
| Heat Absorbing Characteristic | HIGH LIGHT TRANSMISSION |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| A51B16179-11 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| A51B16179-11 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
| A51B16179-11 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 9330-01-042-2004 is a Window,observation, manufactured by Northrop Grumman Systems Corporation, classified under FSC 9330, Plastics Fabricated Materials. Status: active.
NSN 9330-01-042-2004 has 1 manufacturer part number on file: A51B16179-11 (Northrop Grumman Systems Corporation).
Key specifications for A51B16179-11: Insulating Air Space Material Arrangement: PLASTIC TO PLASTIC; Overall Diameter: 1.200 INCHES NOMINAL IN; Surface Finish: FINE FINISHED; Overall Thickness: 0.187 INCHES NOMINAL IN. 11 specifications are 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.
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.