The Ring,retaining,optical Element, cataloged under National Stock Number 1240-00-079-5185, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-00-079-5185 |
| Item Name | Ring,retaining,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Status | ACTIVE |
| Internal Flange Thickness | 0.047 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN |
| Material Document and Classification | WW-T-700/6, T6, TYPE I FED SPEC SINGLE MATERIAL RESPONSE |
| Outside Diameter | 4.885 INCHES MINIMUM AND 4.895 INCHES MAXIMUM IN |
| Aperture Diameter | 4.090 INCHES MINIMUM AND 4.110 INCHES MAXIMUM IN |
| Mounting Configuration | FOUR MOUNTING HOLES |
| Material | ALUMINUM ALLOY 6061 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 929C956P1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1240-00-079-5185 is a Ring,retaining,optical Element, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
Key specifications for 1240-00-079-5185: Internal Flange Thickness: 0.047 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN; Material Document and Classification: WW-T-700/6, T6, TYPE I FED SPEC SINGLE MATERIAL RESPONSE; Outside Diameter: 4.885 INCHES MINIMUM AND 4.895 INCHES MAXIMUM IN; Aperture Diameter: 4.090 INCHES MINIMUM AND 4.110 INCHES MAXIMUM IN. 6 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 1240-00-079-5185 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.