The Cell,optical Element, cataloged under National Stock Number 1240-01-257-9643, 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 11 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-257-9643 |
| Primary Part Number | 350311 |
| 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 | INTERNAL THREAD |
| Overall Diameter | 1.248 INCHES NOMINAL IN |
| Eccentric Construction | NOT PROVIDED |
| Thread Location | INTERNAL |
| Chamfer Location | BOTH ENDS |
| Thread Direction | RIGHT-HAND |
| Chamfer Size | 0.010 IN. BY 15 DEG IN |
| Thread Size | 000-120 |
| Screw Thread Series Designator | UNF |
| Thread Class | 1B |
| Material | STEEL |
| 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 |
|---|---|
| 350311 PRIMARY | Northrop Grumman Corp Electronic Systems Defensive System Div (USA) |
NSN 1240-01-257-9643 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 1240-01-257-9643 has 1 manufacturer part number on file: 350311 (Northrop Grumman Corp Electronic Systems Defensive System Div).
Key specifications for 350311: Element Securing Method: INTERNAL THREAD; Overall Diameter: 1.248 INCHES NOMINAL IN; Eccentric Construction: NOT PROVIDED; Overall Length: 0.140 INCHES NOMINAL IN. 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 1240-01-257-9643 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.