The Lens,optical Instrument, cataloged under National Stock Number 6650-00-026-8137, 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 Naval Sea Systems Command. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6650-00-026-8137 |
| Primary Part Number | 799597-1 |
| Item Name | Lens,optical Instrument |
| FSC / FSG | 6650 / 66 — Optical Instruments, Test Equipment, Components and Accessories |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Individual Lens Style | DOUBLE CONVEX AND DOUBLE CONCAVE |
| Back Focal Length | 3.729 INCHES IN |
| Front Focal Length | 3.729 INCHES IN |
| Element Left Surface Radius | -0.985 INCHES AND 2.165 INCHES AND 0.985 INCHES IN |
| Equivalent Focal Length | 4.112 INCHES IN |
| Element Right Surface Radius | -0.985 INCHES AND 0.985 INCHES AND 2.165 INCHES IN |
| Material Document and Classification | JAN-G-174, GRADE C MIL SPEC SINGLE MATERIAL RESPONSE |
| Diameter | 1.377 INCHES NOMINAL IN |
| Abbe Constant | 63.500 AND 36.200 |
| Axial Thickness | 0.492 INCHES NOMINAL AND 0.074 INCHES NOMINAL IN |
| Compound Lens Edge Thickness | 0.835 INCHES NOMINAL IN |
| Material | GLASS OPTICAL |
| Refraction Index | 1.5110 NOMINAL AND 1.6210 NOMINAL |
| Compound Lens Style | TRIPLET |
| Compound Lens Overall Axial Thickness | 1.058 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 |
|---|---|
| 799597-1 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 799597-1 | 5/9 Secondary reference Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
NSN 6650-00-026-8137 is a Lens,optical Instrument, manufactured by Naval Sea Systems Command, classified under FSC 6650, Optical Instruments, Test Equipment, Components and Accessories. Status: active.
NSN 6650-00-026-8137 has 1 manufacturer part number on file: 799597-1 (Naval Sea Systems Command).
Key specifications for 799597-1: Individual Lens Style: DOUBLE CONVEX AND DOUBLE CONCAVE; Back Focal Length: 3.729 INCHES IN; Front Focal Length: 3.729 INCHES IN; Element Left Surface Radius: -0.985 INCHES AND 2.165 INCHES AND 0.985 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.
NSN 6650-00-026-8137 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.