The Periscope Subassembly, cataloged under National Stock Number 1240-01-419-3932, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1240-01-419-3932 |
| Primary Part Number | 400-6537777 IT 16SQ |
| Item Name | Periscope Subassembly |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | QUALITY ASSURANCE TESTED FOR SUBMARINE ANTENNA APPLICATION |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 400-6537777 IT 16SQ | Naval Inventory Control Point Mechanicsburg (USA) |
| 6537777 IT 16AQ | Naval Inventory Control Point Mechanicsburg (USA) |
| 6537777 IT 16 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 400-6537777 IT 16 | 3/1 Design control — primary reference Naval Sea Systems Command |
NSN 1240-01-419-3932 is a Periscope Subassembly, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-419-3932 has 3 manufacturer part numbers on file: 400-6537777 IT 16SQ (Naval Inventory Control Point Mechanicsburg), 6537777 IT 16AQ (Naval Inventory Control Point Mechanicsburg), 6537777 IT 16 (Naval Sea Systems Command).
Key specifications for 400-6537777 IT 16SQ: Criticality Code Justification: ZZZY; Special Features: BUMPER; Reference Number Differentiating Characteristics: QUALITY ASSURANCE TESTED FOR SUBMARINE ANTENNA APPLICATION. 2 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.
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.