The Window,optical Instrument, cataloged under National Stock Number 1240-01-116-6993, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Lockheed Martin Librascope Corporation. Government technical data includes 8 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-116-6993 |
| Primary Part Number | L317000135 |
| Item Name | Window,optical Instrument |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Lockheed Martin Librascope Corporation |
| Status | ACTIVE |
| Length | 24.969 INCHES MINIMUM AND 25.031 INCHES MAXIMUM IN |
| Material Document and Classification | DD-G-451, TYPE 1 FED SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Reflection Reducing Surface | BOTH |
| Polished Periphery | NOT PROVIDED |
| Width | 21.969 INCHES MINIMUM AND 22.031 INCHES MAXIMUM IN |
| Material | GLASS PLATE LOCATION NOT OTHERWISE SPECIFIED |
| Polished Surface | BOTH |
| Thickness | 0.344 INCHES MINIMUM AND 0.422 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| L317000135 PRIMARY | Lockheed Martin Librascope Corporation (USA) |
| L317000135 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
NSN 1240-01-116-6993 is a Window,optical Instrument, manufactured by Lockheed Martin Librascope Corporation, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-116-6993 has 2 manufacturer part numbers on file: L317000135 (Lockheed Martin Librascope Corporation), L317000135 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for L317000135: Length: 24.969 INCHES MINIMUM AND 25.031 INCHES MAXIMUM IN; Material Document and Classification: DD-G-451, TYPE 1 FED SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED; Reflection Reducing Surface: BOTH; Polished Periphery: NOT PROVIDED. 8 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 1240-01-116-6993 has DEMIL Code B. 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.