The Lens,ophthalmic,compound, cataloged under National Stock Number 6540-00-001-0741, is classified within Federal Supply Class 6540 (Ophthalmic Instruments, Equipment, and Supplies) of the Medical, Dental, and Veterinary Equipment group. The manufacturer of record is I F Optical Company Inc Dba Chicago Optical Co. Government technical data includes 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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. Unit of issue: PR.
| Parameter | Value |
|---|---|
| NSN | 6540-00-001-0741 |
| Primary Part Number | M375M25 |
| Item Name | Lens,ophthalmic,compound |
| FSC / FSG | 6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies |
| Manufacturer | I F Optical Company Inc Dba Chicago Optical Co |
| Status | ACTIVE |
| Base Curve Diopter | 5.75 PLUS NOMINAL |
| Supplementary Features | UNCUT |
| Style Designator | ROUND |
| Diameter | 71.0 MILLIMETERS MINIMUM MM |
| Cross-Sectional Shape Style | SPHEROCYLINDER COMPOUND |
| Departure From Cited Document | AS MODIFIED BY DIAMETER |
| Nondefinitive Spec/std Data | B CLASS AND 4 STYLE |
| Sphere Curve Inside Diopter | 3.75 MINUS MAXIMUM |
| Light Transmission | UNTINTED |
| Material | PLASTIC SINGLE VISION |
| Cylinder Curve Inside Diopter | 0.25 MINUS MAXIMUM |
| Thickness | 1.6 MILLIMETERS NOMINAL MM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Unit of Issue | PR |
| Part Number | Manufacturer |
|---|---|
| M375M25 PRIMARY | I F Optical Company Inc Dba Chicago Optical Co (USA) |
| Reference | Meaning |
|---|---|
| M375M025 | 5/9 Secondary reference U.S. Government activity |
NSN 6540-00-001-0741 is a Lens,ophthalmic,compound, manufactured by I F Optical Company Inc Dba Chicago Optical Co, classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
NSN 6540-00-001-0741 has 1 manufacturer part number on file: M375M25 (I F Optical Company Inc Dba Chicago Optical Co).
Key specifications for M375M25: Base Curve Diopter: 5.75 PLUS NOMINAL; Supplementary Features: UNCUT; Style Designator: ROUND; Diameter: 71.0 MILLIMETERS MINIMUM MM. 12 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.