The Retainer,optical Element, cataloged under National Stock Number 1240-01-078-8280, 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 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-078-8280 |
| Primary Part Number | 12266634 |
| 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 |
| Hole Chamfer Diameter | 3.245 INCHES MINIMUM AND 3.255 INCHES MAXIMUM IN |
| Style Designator | RECESSED |
| Setscrew Notch | NOT PROVIDED |
| Recess Depth | 0.053 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN |
| Recess Diameter | 3.060 INCHES MINIMUM AND 3.070 INCHES MAXIMUM IN |
| Guide Location | BOTH EDGES |
| Hole Chamfer Angle in Deg | 45.0 |
| Thread Size | B3.000 IN.-32 IN |
| Guide Design | THREAD RELIEF |
| Internal Annular Serration | NOT PROVIDED |
| Material | ALUMINUM ALLOY 6061 |
| Hole Diameter | 0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 12266634 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 12266634 | 5/9 Secondary reference Drs Sustainment Systems, Inc. |
NSN 1240-01-078-8280 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 1240-01-078-8280 has 1 manufacturer part number on file: 12266634 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12266634: Hole Chamfer Diameter: 3.245 INCHES MINIMUM AND 3.255 INCHES MAXIMUM IN; Style Designator: RECESSED; Setscrew Notch: NOT PROVIDED; Overall Length: 0.477 INCHES MINIMUM AND 0.487 INCHES MAXIMUM IN. 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 1240-01-078-8280 has DEMIL Code Q. 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.