The Retainer,optical Element, cataloged under National Stock Number 1240-01-239-2396, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1240-01-239-2396 |
| Item Name | Retainer,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Status | ACTIVE |
| Shoulder Length | 0.200 INCHES NOMINAL IN |
| Hole or Slot Quantity | 4 |
| Drive Type | SLOTTED |
| Drive Facility Angular Spacing in Deg | 90.0 |
| Shoulder Thread Size | 3.380IN.-28 IN |
| Style Designator | SHOULDERED |
| Setscrew Notch | NOT PROVIDED |
| Material Document and Classification | QQ-A-200/8, 6061, T6 FED SPEC SINGLE MATERIAL RESPONSE |
| Guide Location | EDGE OPPOSITE DRIVE EDGE |
| Guide Design | THREAD CHAMFER |
| Depth | 0.150 INCHES NOMINAL IN |
| Width | 0.060 INCHES NOMINAL IN |
| Internal Annular Serration | NOT PROVIDED |
| Material | ALUMINUM ALLOY 6061 |
| Flange Thread Size | 3.500IN.-28 IN |
| Hole Diameter | 3.170 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 |
|---|---|
| SM-C-805055 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1240-01-239-2396 is a Retainer,optical Element, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
Key specifications for 1240-01-239-2396: Shoulder Length: 0.200 INCHES NOMINAL IN; Hole or Slot Quantity: 4; Drive Type: SLOTTED; Drive Facility Angular Spacing in Deg: 90.0. 16 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 1240-01-239-2396 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.