The Lens,optical Instrument, cataloged under National Stock Number 6650-00-520-4253, is classified within Federal Supply Class 6650 (Optical Instruments, Test Equipment, Components and Accessories) of the Instruments and Laboratory 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6650-00-520-4253 |
| Primary Part Number | 5204253 |
| Item Name | Lens,optical Instrument |
| FSC / FSG | 6650 / 66 — Optical Instruments, Test Equipment, Components and Accessories |
| Manufacturer | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate |
| Status | ACTIVE |
| FSC Application Data | BINOCULAR,M7,M16 |
| Individual Lens Style | DOUBLE CONVEX AND MENISCUS DIVERGING |
| Back Focal Length | 1.281 INCHES IN |
| Element Left Surface Radius | 0.793 INCHES AND -0.595 INCHES IN |
| Equivalent Focal Length | 1.444 INCHES IN |
| Element Right Surface Radius | -0.595 INCHES AND -4.220 INCHES IN |
| Material Document and Classification | MIL-G-174,GRADE C,TYPE 541-599 MIL SPEC 1ST MATERIAL RESPONSE AND MIL-G-174,GRADE C,TYPE 621-362 MIL SPEC 2ND MATERIAL RESPONSE |
| Diameter | 0.686 INCHES MINIMUM AND 0.689 INCHES MAXIMUM IN |
| Abbe Constant | 59.900 AND 36.200 |
| Axial Thickness | 0.236 INCHES NOMINAL AND 0.024 INCHES NOMINAL IN |
| Compound Lens Edge Thickness | 0.166 INCHES NOMINAL IN |
| Material | GLASS OPTICAL |
| Refraction Index | 1.5411 NOMINAL AND 1.6210 NOMINAL |
| Compound Lens Style | DOUBLET |
| Compound Lens Overall Axial Thickness | 0.240 INCHES MINIMUM AND 0.272 INCHES MAXIMUM 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 |
|---|---|
| 5204253 PRIMARY | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate (USA) |
| Reference | Meaning |
|---|---|
| 6650005204253 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 1240005204253 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
NSN 6650-00-520-4253 is a Lens,optical Instrument, manufactured by Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate, classified under FSC 6650, Optical Instruments, Test Equipment, Components and Accessories. Status: active.
NSN 6650-00-520-4253 has 1 manufacturer part number on file: 5204253 (Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate).
Key specifications for 5204253: FSC Application Data: BINOCULAR,M7,M16; Individual Lens Style: DOUBLE CONVEX AND MENISCUS DIVERGING; Back Focal Length: 1.281 INCHES IN; Element Left Surface Radius: 0.793 INCHES AND -0.595 INCHES IN. 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.