The Ring,retaining,optical Element, cataloged under National Stock Number 1240-01-258-2395, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier. Government technical data includes 4 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-258-2395 |
| Primary Part Number | 704AS1033-1 AND 704AS1638-2 |
| Item Name | Ring,retaining,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| Status | ACTIVE |
| Internal Flange Thickness | 0.060 INCHES NOMINAL IN |
| Outside Diameter | 6.970 INCHES NOMINAL IN |
| Aperture Diameter | 5.570 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 704AS1033-1 AND 704AS1638-2 PRIMARY | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| 704AS1033-1 AND 704AS1638-2 | 5/2 Secondary reference U.S. Government activity |
| 704AS1638-2 | 5/9 Secondary reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| 891638 | 5/9 Secondary reference U.S. Government activity |
NSN 1240-01-258-2395 is a Ring,retaining,optical Element, manufactured by Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-258-2395 has 1 manufacturer part number on file: 704AS1033-1 AND 704AS1638-2 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier).
Key specifications for 704AS1033-1 AND 704AS1638-2: Internal Flange Thickness: 0.060 INCHES NOMINAL IN; Overall Length: 1.540 INCHES NOMINAL IN; Outside Diameter: 6.970 INCHES NOMINAL IN; Aperture Diameter: 5.570 INCHES NOMINAL IN. 4 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.