The Retainer,optical Element, cataloged under National Stock Number 1240-01-050-4810, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-050-4810 |
| Primary Part Number | 12266637 |
| Item Name | Retainer,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Flange Diameter | 4.930 INCHES NOMINAL IN |
| Shoulder Length | 1.034 INCHES NOMINAL IN |
| Hole or Slot Quantity | 8 |
| Drive Type | DRILLED HOLE |
| Drive Facility Angular Spacing in Deg | 45.0 |
| Shoulder Thread Size | 4.000IN.-6 IN |
| Style Designator | SHOULDERED |
| Setscrew Notch | NOT PROVIDED |
| Diameter | 0.147 INCHES NOMINAL IN |
| Guide Location | DRIVE EDGE |
| Guide Design | THREAD CHAMFER |
| Depth | 0.150 INCHES NOMINAL IN |
| Internal Annular Serration | NOT PROVIDED |
| Material | ALUMINUM ALLOY 6061 |
| Hole Diameter | 3.490 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 12266637 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 6558-262 | 5/9 Secondary reference Recon/optical, Inc. |
| 12266637 | 5/9 Secondary reference Drs Sustainment Systems, Inc. |
NSN 1240-01-050-4810 is a Retainer,optical Element, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-050-4810 has 1 manufacturer part number on file: 12266637 (U S Army Tank Automotive Command Amsta-Im-Mm).
1 possible match (shared part number, not a government interchangeability claim): 5905-01-181-4584. Verify interchangeability with system specifications before substitution.
Key specifications for 12266637: Flange Diameter: 4.930 INCHES NOMINAL IN; Shoulder Length: 1.034 INCHES NOMINAL IN; Hole or Slot Quantity: 8; Drive Type: DRILLED HOLE. 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.
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.