The Ring,retaining,optical Element, cataloged under National Stock Number 1240-01-054-5789, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-054-5789 |
| Primary Part Number | 10556096 |
| Item Name | Ring,retaining,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate |
| Status | ACTIVE |
| Groove Location | INSIDE END OF THREAD |
| Internal Flange Thickness | 1.750 INCHES NOMINAL IN |
| Groove Diameter | 2.490 INCHES NOMINAL IN |
| Material Document and Classification | QQ-A-225/8, ALLOY 6061, T6 FED SPEC SINGLE MATERIAL RESPONSE OR WW-T-700/3, ALLOY 2024, T3 FED SPEC SINGLE MATERIAL RESPONSE OR WW-T-700/6, ALLOY 6061, T6 FED SPEC SINGLE MATERIAL RESPONSE |
| Outside Diameter | 2.688 INCHES NOMINAL IN |
| Thread Length | 0.172 INCHES IN |
| Thread Location | INTERNAL |
| Aperture Diameter | 2.406 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Inner Groove Width | 0.078 INCHES NOMINAL IN |
| Thread Size | 2 1/2-28 |
| Screw Thread Series Designator | UNS |
| Surface Treatment | ANODIZE |
| Thread Class | 2B |
| Material | ALUMINUM ALLOY 2024 OR ALUMINUM ALLOY 6061 |
| 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 |
|---|---|
| 10556096 PRIMARY | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate (USA) |
NSN 1240-01-054-5789 is a Ring,retaining,optical Element, manufactured by Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-054-5789 has 1 manufacturer part number on file: 10556096 (Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate).
Key specifications for 10556096: Groove Location: INSIDE END OF THREAD; Internal Flange Thickness: 1.750 INCHES NOMINAL IN; Groove Diameter: 2.490 INCHES NOMINAL IN; Material Document and Classification: QQ-A-225/8, ALLOY 6061, T6 FED SPEC SINGLE MATERIAL RESPONSE OR WW-T-700/3, ALLOY 2024, T3 FED SPEC SINGLE MATERIAL RESPONSE OR WW-T-700/6, ALLOY 6061, T6 FED SPEC SINGLE MATERIAL RESPONSE. 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.
NSN 1240-01-054-5789 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.