The Lens,optical Instrument, cataloged under National Stock Number 6650-00-167-7971, is classified within Federal Supply Class 6650 (Optical Instruments, Test Equipment, Components and Accessories) of the Instruments and Laboratory Equipment group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6650-00-167-7971 |
| Item Name | Lens,optical Instrument |
| FSC / FSG | 6650 / 66 — Optical Instruments, Test Equipment, Components and Accessories |
| Status | ACTIVE |
| FSC Application Data | DETECTING SET,INFRARED,NONCOMMUNICATION |
| Individual Lens Style | MENISCUS DIVERGING |
| Back Focal Length | 15.267 INCHES IN |
| Front Focal Length | 15.070 INCHES IN |
| Element Left Surface Radius | -4.457 INCHES IN |
| Equivalent Focal Length | 15.129 INCHES IN |
| Element Right Surface Radius | -10.453 INCHES IN |
| Material Document and Classification | MIL-G-174, TYPE BSC-1, 517-645 MIL SPEC SINGLE MATERIAL RESPONSE |
| Diameter | 2.650 INCHES NOMINAL IN |
| Abbe Constant | 64.500 |
| Axial Thickness | 0.119 INCHES NOMINAL IN |
| Material | GLASS OPTICAL |
| Refraction Index | 1.5170 NOMINAL |
| Single Lens Style | MENISCUS DIVERGING |
| 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 |
| Reference | Meaning |
|---|---|
| 1122029 | 5/9 Secondary reference Bae Systems Information and Electronic Systems Integration I |
| SCC635113 | D/9 Drawing number reference only U.S. Government activity |
| 1122029 | 5/2 Secondary reference U.S. Government activity |
| SCC635113-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 6650-00-167-7971 is a Lens,optical Instrument, classified under FSC 6650, Optical Instruments, Test Equipment, Components and Accessories. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5360-00-423-7899. Verify interchangeability with system specifications before substitution.
Key specifications for 6650-00-167-7971: FSC Application Data: DETECTING SET,INFRARED,NONCOMMUNICATION; Individual Lens Style: MENISCUS DIVERGING; Back Focal Length: 15.267 INCHES IN; Front Focal Length: 15.070 INCHES IN. 14 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 6650-00-167-7971 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.