The Ring,retaining,optical Element, cataloged under National Stock Number 1240-00-931-8901, 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 17 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 | 1240-00-931-8901 |
| Primary Part Number | 7791929 |
| 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 | ADJACENT TO INTERNAL FLANGE |
| FSC Application Data | SIGHT,REFLEX |
| Internal Flange Thickness | 0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-F-495 MIL SPEC SINGLE TREATMENT RESPONSE |
| Groove Diameter | 1.322 INCHES MINIMUM AND 1.330 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-B-626,COMP 360,1/2H FED SPEC SINGLE MATERIAL RESPONSE |
| Outside Diameter | 1.377 INCHES MINIMUM AND 1.385 INCHES MAXIMUM IN |
| Thread Length | 0.200 INCHES IN |
| Thread Location | INTERNAL |
| Aperture Diameter | 0.880 INCHES MINIMUM AND 0.920 INCHES MAXIMUM IN |
| Thread Direction | RIGHT-HAND |
| Inner Groove Width | 0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN |
| Thread Size | 1.312 IN.-48 IN |
| Screw Thread Series Designator | UNS |
| Surface Treatment | OXIDE |
| Thread Class | 3B |
| Material | COPPER ALLOY 360 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 7791929 PRIMARY | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate (USA) |
NSN 1240-00-931-8901 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 1240-00-931-8901 has 1 manufacturer part number on file: 7791929 (Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate).
Key specifications for 7791929: Groove Location: ADJACENT TO INTERNAL FLANGE; FSC Application Data: SIGHT,REFLEX; Internal Flange Thickness: 0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-F-495 MIL SPEC SINGLE TREATMENT RESPONSE. 17 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 1240-00-931-8901 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.