The Periscope Subassembly, cataloged under National Stock Number 1240-01-559-6261, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-559-6261 |
| Item Name | Periscope Subassembly |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 7490981 | 3/1 Design control — primary reference Naval Sea Systems Command |
| 7490981 | 3/1 Design control — primary reference Naval Undersea Warfare Ctr |
NSN 1240-01-559-6261 is a Periscope Subassembly, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
Key specifications for 1240-01-559-6261: Part Name Assigned by Controlling Agency: (INAVY)EYEPIECE BOX; End Item Identification: 7490981(53711) SUBIS EYEPIECE BOX UNIT 2;8226758(53711) TY18B EPB UNIT 2, ECPN18-592;7647(53711) SUBIS 2.1 18B EYEPIECE BOX UNIT 2. 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 1240-01-559-6261 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.