The Lens,optical Instrument, cataloged under National Stock Number 6650-00-520-4757, 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 U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 14 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 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 | 6650-00-520-4757 |
| Primary Part Number | 5204757 |
| Item Name | Lens,optical Instrument |
| FSC / FSG | 6650 / 66 — Optical Instruments, Test Equipment, Components and Accessories |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Individual Lens Style | DOUBLE CONVEX AND MENISCUS DIVERGING |
| Back Focal Length | 0.905 INCHES IN |
| Element Left Surface Radius | -0.629 INCHES AND 0.473 INCHES IN |
| Equivalent Focal Length | 1.141 INCHES IN |
| Element Right Surface Radius | -0.473 INCHES AND 3.351 INCHES IN |
| Material Document and Classification | JAN-G-174, GRADE C MIL SPEC SINGLE MATERIAL RESPONSE |
| Diameter | 0.689 INCHES NOMINAL IN |
| Abbe Constant | 36.600 AND 59.900 |
| Axial Thickness | 0.335 INCHES NOMINAL AND 0.430 INCHES NOMINAL IN |
| Compound Lens Edge Thickness | 0.211 INCHES NOMINAL IN |
| Material | GLASS OPTICAL |
| Refraction Index | 1.5411 NOMINAL AND 1.6170 NOMINAL |
| Compound Lens Style | DOUBLET |
| Compound Lens Overall Axial Thickness | 0.394 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 |
|---|---|
| 5204757 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 6650-00-520-4757 is a Lens,optical Instrument, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 6650, Optical Instruments, Test Equipment, Components and Accessories. Status: active.
NSN 6650-00-520-4757 has 1 manufacturer part number on file: 5204757 (U S Army Tank Automotive Command Amsta-Im-Mm).
1 possible match (shared part number, not a government interchangeability claim): 1285-01-255-1687. Verify interchangeability with system specifications before substitution.
Key specifications for 5204757: Individual Lens Style: DOUBLE CONVEX AND MENISCUS DIVERGING; Back Focal Length: 0.905 INCHES IN; Element Left Surface Radius: -0.629 INCHES AND 0.473 INCHES IN; Equivalent Focal Length: 1.141 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 6650-00-520-4757 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.