The Lens Blank,ophthalmic,sphere,sem, cataloged under National Stock Number 6540-00-926-4778, is classified within Federal Supply Class 6540 (Ophthalmic Instruments, Equipment, and Supplies) of the Medical, Dental, and Veterinary Equipment group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6540-00-926-4778 |
| Item Name | Lens Blank,ophthalmic,sphere,sem |
| FSC / FSG | 6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies |
| Status | ACTIVE |
| Base Curve Diopter | 8.50 PLUS NOMINAL |
| Style Designator | ROUND-RECTANGULAR WITH ROUNDED CORNERS |
| Diameter | 54.0 MILLIMETERS MINIMUM AND 60.0 MILLIMETERS MAXIMUM MM |
| Cross-Sectional Shape Style | SPHERE |
| Sphere Curve Outside Diopter | 8.50 PLUS MAXIMUM |
| Nondefinitive Spec/std Data | 1 TYPE AND D CLASS |
| Height | 54.0 MILLIMETERS MINIMUM AND 57.0 MILLIMETERS MAXIMUM MM |
| Width | 54.0 MILLIMETERS MINIMUM AND 57.0 MILLIMETERS MAXIMUM MM |
| Light Transmission | UNTINTED |
| Material | GLASS SODA-LIME SINGLE VISION |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| MILL16991 | 4/1 Identification reference U.S. Government activity |
NSN 6540-00-926-4778 is a Lens Blank,ophthalmic,sphere,sem, classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
Key specifications for 6540-00-926-4778: Base Curve Diopter: 8.50 PLUS NOMINAL; Style Designator: ROUND-RECTANGULAR WITH ROUNDED CORNERS; Diameter: 54.0 MILLIMETERS MINIMUM AND 60.0 MILLIMETERS MAXIMUM MM; Cross-Sectional Shape Style: SPHERE. 10 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.