The Retainer,optical Element, cataloged under National Stock Number 1240-01-186-1801, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1240-01-186-1801 |
| Item Name | Retainer,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Status | ACTIVE |
| Radius From Geometric Axis to Hole Center | 1.844 INCHES NOMINAL IN |
| Flange Diameter | 3.980 INCHES MINIMUM AND 4.000 INCHES MAXIMUM IN |
| FSC Application Data | DETECTING-RANGING SET AN/AAS-38 |
| Hole or Slot Quantity | 3 |
| Drive Type | DRILLED HOLE |
| Style Designator | SHOULDERED |
| Setscrew Notch | NOT PROVIDED |
| Material Document and Classification | QQ-A-250/11, T6 FED SPEC SINGLE MATERIAL RESPONSE |
| Diameter | 0.076 INCHES NOMINAL IN |
| Guide Design | THREAD RELIEF |
| Surface Treatment | ANODIZE |
| Width | 0.063 INCHES NOMINAL IN |
| Internal Annular Serration | NOT PROVIDED |
| Material | ALUMINUM ALLOY 6061 |
| Hole Diameter | 3.400 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 3081146-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1240-01-186-1801 is a Retainer,optical Element, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
Key specifications for 1240-01-186-1801: Radius From Geometric Axis to Hole Center: 1.844 INCHES NOMINAL IN; Flange Diameter: 3.980 INCHES MINIMUM AND 4.000 INCHES MAXIMUM IN; FSC Application Data: DETECTING-RANGING SET AN/AAS-38; Hole or Slot Quantity: 3. 15 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 1240-01-186-1801 has DEMIL Code B. 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.