The Periscope Subassembly, cataloged under National Stock Number 1240-01-325-5541, 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. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-325-5541 |
| Primary Part Number | 6537779 ITEM 3 |
| Item Name | Periscope Subassembly |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| 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 |
|---|---|
| 6537779 ITEM 3 PRIMARY | Naval Sea Systems Command (USA) |
| 6537779-3 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| W8810403 | 5/9 Secondary reference Naval Ship Engineering Center Philadelphia Division Submarine Antenna Quality Assurance |
NSN 1240-01-325-5541 is a Periscope Subassembly, manufactured by Naval Sea Systems Command, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-325-5541 has 2 manufacturer part numbers on file: 6537779 ITEM 3 (Naval Sea Systems Command), 6537779-3 (Naval Sea Systems Command).
Key specifications for 6537779 ITEM 3: Special Features: MAIN RAIL,LOWER;MATL NI-CU PER QQ-N-281,CL A,HF; End Item Identification: WELL BUMPER ASSY PERISCOPE NO 1. 0 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 1240-01-325-5541 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.