The Window,observation, cataloged under National Stock Number 9330-01-021-4684, is classified within Federal Supply Class 9330 (Plastics Fabricated Materials) of the Nonmetallic Fabricated Materials group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 9330-01-021-4684 |
| Item Name | Window,observation |
| FSC / FSG | 9330 / 93 — Plastics Fabricated Materials |
| Status | ACTIVE |
| Insulating Air Space Material Arrangement | PLASTIC TO GLASS |
| Overall Diameter | 5.900 INCHES NOMINAL IN |
| Overall Thickness | 0.270 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN |
| Style Designator | CIRCULAR |
| Material Document and Classification | MIL-G-25871,TYPE 2,CLASS A MIL SPEC SINGLE MATERIAL RESPONSE |
| Features Provided | FRAME |
| Edge Type | BEVELED |
| Ply Quantity | 3 |
| Material | GLASS |
| Wire Mesh Pattern | SQUARE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 204-30972-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 9330-01-021-4684 is a Window,observation, classified under FSC 9330, Plastics Fabricated Materials. Status: active.
Key specifications for 9330-01-021-4684: Insulating Air Space Material Arrangement: PLASTIC TO GLASS; Overall Diameter: 5.900 INCHES NOMINAL IN; Overall Thickness: 0.270 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN; Style Designator: CIRCULAR. 10 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.