The Periscope Subassembly, cataloged under National Stock Number 1240-01-347-7983, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-347-7983 |
| Primary Part Number | 400 6640226 ITEM 02 |
| Item Name | Periscope Subassembly |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Major Components | ADAPTER,UPPER BEARING 1 |
| 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 |
|---|---|
| 400 6640226 ITEM 02 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| F8820402 | 3/9 Design control — primary reference Naval Ship Engineering Center Philadelphia Division Submarine Antenna Quality Assurance |
| 6744239-2 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
NSN 1240-01-347-7983 is a Periscope Subassembly, manufactured by Naval Sea Systems Command, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-347-7983 has 1 manufacturer part number on file: 400 6640226 ITEM 02 (Naval Sea Systems Command).
Key specifications for 400 6640226 ITEM 02: Major Components: ADAPTER,UPPER BEARING 1; End Item Identification: INDEP FAIRING ASSY,PERISCOPE NO. 2. 1 specification is 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 1240-01-347-7983 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.