The Lens,optical Instrument, cataloged under National Stock Number 6650-00-210-4388, 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 Bausch & Lomb Inc. Government technical data includes 16 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6650-00-210-4388 |
| Primary Part Number | MIL1802 |
| Item Name | Lens,optical Instrument |
| FSC / FSG | 6650 / 66 — Optical Instruments, Test Equipment, Components and Accessories |
| Manufacturer | Bausch & Lomb Inc |
| Status | ACTIVE |
| FSC Application Data | OPTICAL SIGHTING AND RANGING EQUIPMENT |
| Individual Lens Style | DOUBLE CONVEX AND MENISCUS DIVERGING |
| Back Focal Length | 3.920 INCHES IN |
| Front Focal Length | 3.752 INCHES IN |
| Element Left Surface Radius | -2.047 INCHES AND 3.226 INCHES IN |
| Equivalent Focal Length | 4.034 INCHES IN |
| Element Right Surface Radius | -2.047 INCHES AND -6.169 INCHES IN |
| Material Document and Classification | MIL-G-174, CLASS 1, GRADE B MIL SPEC SINGLE MATERIAL RESPONSE |
| Diameter | 2.046 INCHES MINIMUM AND 2.047 INCHES MAXIMUM IN |
| Abbe Constant | 58.800 AND 29.300 |
| Axial Thickness | 0.512 INCHES NOMINAL AND 0.118 INCHES NOMINAL IN |
| Compound Lens Edge Thickness | 0.263 INCHES NOMINAL IN |
| Material | GLASS OPTICAL |
| Refraction Index | 1.6111 NOMINAL AND 1.7200 NOMINAL |
| Compound Lens Style | DOUBLET |
| Compound Lens Overall Axial Thickness | 0.630 INCHES NOMINAL 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 |
|---|---|
| MIL1802 | Bausch & Lomb Inc (USA) |
| Reference | Meaning |
|---|---|
| 1049121 | 3/9 Design control — primary reference Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| 1049121 | 5/9 Secondary reference Grayco Optical Corp |
| 1049121 | 5/9 Secondary reference F and H Mfg Corp |
NSN 6650-00-210-4388 is a Lens,optical Instrument, manufactured by Bausch & Lomb Inc, classified under FSC 6650, Optical Instruments, Test Equipment, Components and Accessories. Status: active.
NSN 6650-00-210-4388 has 1 manufacturer part number on file: MIL1802 (Bausch & Lomb Inc).
Key specifications for MIL1802: FSC Application Data: OPTICAL SIGHTING AND RANGING EQUIPMENT; Individual Lens Style: DOUBLE CONVEX AND MENISCUS DIVERGING; Back Focal Length: 3.920 INCHES IN; Front Focal Length: 3.752 INCHES IN. 16 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 6650-00-210-4388 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.