The Ring,retaining,optical Element, cataloged under National Stock Number 1240-01-076-2064, 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 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1240-01-076-2064 |
| Primary Part Number | 12266507-2 |
| Item Name | Ring,retaining,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Internal Flange Thickness | 0.187 INCHES NOMINAL IN |
| Outside Diameter | 4.437 INCHES NOMINAL IN |
| Aperture Diameter | 3.674 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY 6061 |
| 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 |
|---|---|
| 12266507-2 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 12266507-2 | 5/9 Secondary reference Drs Sustainment Systems, Inc. |
NSN 1240-01-076-2064 is a Ring,retaining,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 1240-01-076-2064 has 1 manufacturer part number on file: 12266507-2 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12266507-2: Internal Flange Thickness: 0.187 INCHES NOMINAL IN; Outside Diameter: 4.437 INCHES NOMINAL IN; Aperture Diameter: 3.674 INCHES NOMINAL IN; Special Features: RETAINER,SEAL DIOPTER RING,USED ON RIGHT SIDE; 7 HOLES EQUALLY SPACED,0.093 DIA THRU,0.187 DIA COUNTERBORE X 0.050 DEEP. 4 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.