The Window,optical Instrument, cataloged under National Stock Number 1240-00-926-2913, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment 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10 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1240-00-926-2913 |
| Item Name | Window,optical Instrument |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Status | ACTIVE |
| FSC Application Data | TEST SET,ELECTRONIC SYSTEMS,SPECIALLY DESIGNED,ACFT |
| Surface Finish | GROUND |
| Bevel Depth | 0.005 INCHES NOMINAL IN |
| Material Document and Classification | DD-G-451, TYPE 2, AA QUALITY FED SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Diameter | 1.841 INCHES MINIMUM AND 1.846 INCHES MAXIMUM IN |
| Polished Periphery | NOT PROVIDED |
| Bevel Angle in Deg | 45.000 NOMINAL |
| Material | GLASS SHEET LOCATION NOT OTHERWISE SPECIFIED |
| Polished Surface | BOTH |
| Thickness | 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| MAG393-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1240-00-926-2913 is a Window,optical Instrument, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
Key specifications for 1240-00-926-2913: FSC Application Data: TEST SET,ELECTRONIC SYSTEMS,SPECIALLY DESIGNED,ACFT; Surface Finish: GROUND; Bevel Depth: 0.005 INCHES NOMINAL IN; Material Document and Classification: DD-G-451, TYPE 2, AA QUALITY FED SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED. 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.
NSN 1240-00-926-2913 has DEMIL Code D. 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.