The Ring,retaining,optical Element, cataloged under National Stock Number 1240-00-211-7182, 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6 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1240-00-211-7182 |
| Item Name | Ring,retaining,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Status | ACTIVE |
| FSC Application Data | AIRCRAFT GUNNERY FIRE CONTROL EQUIPMENT |
| Internal Flange Thickness | 0.081 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN |
| Outside Diameter | 2.740 INCHES MINIMUM AND 2.760 INCHES MAXIMUM IN |
| Aperture Diameter | 1.960 INCHES MINIMUM AND 1.980 INCHES MAXIMUM IN |
| Mounting Configuration | SIX 0.169 IN. DIA MOUNTING HOLES EQUALLY SPACED ON 2.375 IN. DIA 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 |
| Reference | Meaning |
|---|---|
| 435-11-3019 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1240-00-211-7182 is a Ring,retaining,optical Element, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
Key specifications for 1240-00-211-7182: FSC Application Data: AIRCRAFT GUNNERY FIRE CONTROL EQUIPMENT; Internal Flange Thickness: 0.081 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN; Overall Length: 0.081 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN; Outside Diameter: 2.740 INCHES MINIMUM AND 2.760 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.
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.