The Cell,optical Element, cataloged under National Stock Number 1240-01-337-0243, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Northrop Grumman Corp Electronic Systems Defensive System Div. Government technical data includes 6 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. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-337-0243 |
| Primary Part Number | 340523 |
| Item Name | Cell,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Northrop Grumman Corp Electronic Systems Defensive System Div |
| Status | ACTIVE |
| Element Securing Method | SCREW |
| Overall Diameter | 2.2657 INCHES MINIMUM AND 2.2660 INCHES MAXIMUM IN |
| Eccentric Construction | NOT PROVIDED |
| Chamfer Location | LARGER DIAMETER END |
| Chamfer Size | 2.130 IN. BY 30 DEG IN |
| Material | ALUMINUM ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 1240-01-337-0243 is a Cell,optical Element, manufactured by Northrop Grumman Corp Electronic Systems Defensive System Div, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-337-0243 has 2 manufacturer part numbers on file: 340523 (Northrop Grumman Corp Electronic Systems Defensive System Div), 340523 (Tempco Engineering Inc Dba Lmi Aerospace).
1 possible match (shared part number, not a government interchangeability claim): 6550-01-588-5089. Verify interchangeability with system specifications before substitution.
Key specifications for 340523: Element Securing Method: SCREW; Overall Diameter: 2.2657 INCHES MINIMUM AND 2.2660 INCHES MAXIMUM IN; Eccentric Construction: NOT PROVIDED; Overall Length: 1.415 INCHES MINIMUM AND 1.425 INCHES MAXIMUM IN. 6 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 1240-01-337-0243 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.