The Window,optical Instrument, cataloged under National Stock Number 1240-00-620-4979, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 1240-00-620-4979 |
| Primary Part Number | 8200495 |
| Item Name | Window,optical Instrument |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate |
| Status | ACTIVE |
| Bevel Depth | 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-G-174, GRADE B, TYPE 517-645 MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Diameter | 2.022 INCHES MINIMUM AND 2.025 INCHES MAXIMUM IN |
| Reflection Reducing Surface | BOTH |
| Polished Periphery | NOT PROVIDED |
| Bevel Angle in Deg | 42.000 MINIMUM AND 48.000 MAXIMUM |
| Material | GLASS OPTICAL LOCATION NOT OTHERWISE SPECIFIED |
| Refraction Index | 1.5170 NOMINAL |
| Polished Surface | BOTH |
| Dispersion | 64.500 ANGSTROMS NOMINAL |
| Thickness | 0.418 INCHES MINIMUM AND 0.458 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 |
| Part Number | Manufacturer |
|---|---|
| 8200495 PRIMARY | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate (USA) |
| 8200495 | General Scientific Corp Dba Surgitel (USA) |
| Reference | Meaning |
|---|---|
| 8200495 | 5/9 Secondary reference Drs Network & Imaging Systems Llc |
| 1240006204979 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
NSN 1240-00-620-4979 is a Window,optical Instrument, manufactured by Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-00-620-4979 has 2 manufacturer part numbers on file: 8200495 (Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate), 8200495 (General Scientific Corp Dba Surgitel).
Key specifications for 8200495: Bevel Depth: 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM IN; Material Document and Classification: MIL-G-174, GRADE B, TYPE 517-645 MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED; Diameter: 2.022 INCHES MINIMUM AND 2.025 INCHES MAXIMUM IN; Reflection Reducing Surface: BOTH. 11 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 1240-00-620-4979 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.