The Retainer,optical Element, cataloged under National Stock Number 1240-00-550-0609, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1240-00-550-0609 |
| Item Name | Retainer,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Status | ACTIVE |
| Hole or Slot Quantity | 2 |
| Drive Type | SLOTTED |
| Drive Facility Angular Spacing in Deg | 180.0 |
| Setscrew Notch | NOT PROVIDED |
| Material Document and Classification | QQ-A-225/6, T4 FED SPEC SINGLE MATERIAL RESPONSE |
| Thread Size | 0.500 IN. -32NS-2A A |
| Surface Treatment | ANODIZE |
| Depth | 0.040 INCHES NOMINAL IN |
| Width | 0.060 INCHES NOMINAL IN |
| Internal Annular Serration | NOT PROVIDED |
| Material | ALUMINUM ALLOY 2024 |
| Hole Diameter | 0.370 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 |
|---|---|
| 710-1342 | 3/9 Design control — primary reference Corning Oca Corp |
NSN 1240-00-550-0609 is a Retainer,optical Element, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
Key specifications for 1240-00-550-0609: Hole or Slot Quantity: 2; Drive Type: SLOTTED; Drive Facility Angular Spacing in Deg: 180.0; Setscrew Notch: NOT PROVIDED. 12 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 1240-00-550-0609 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.