The Lens Blank,ophthalmic,sphere,sem, cataloged under National Stock Number 6540-01-375-4090, 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 Silor Optical of Florida Inc. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active. Unit of issue: PR.
| Parameter | Value |
|---|---|
| NSN | 6540-01-375-4090 |
| Primary Part Number | P0.50 BC |
| Item Name | Lens Blank,ophthalmic,sphere,sem |
| FSC / FSG | 6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies |
| Manufacturer | Silor Optical of Florida Inc |
| Status | ACTIVE |
| Base Curve Diopter | 0.50 PLUS NOMINAL |
| Style Designator | ROUND-RECTANGULAR WITH ROUNDED CORNERS |
| Diameter | 71.0 MILLIMETERS NOMINAL MM |
| Cross-Sectional Shape Style | SPHERE |
| Sphere Curve Outside Diopter | 0.50 PLUS NOMINAL |
| Height | 71.0 MILLIMETERS NOMINAL MM |
| Width | 71.0 MILLIMETERS NOMINAL MM |
| Light Transmission | UNTINTED |
| Material | PLASTIC SINGLE VISION |
| Cross Curve Diopter | 0.50 PLUS NOMINAL |
| Thickness | 12.0 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 |
|---|---|
| P0.50 BC PRIMARY | Silor Optical of Florida Inc (USA) |
| 0.50BC,SPHERE,CR-39,71MM | Dispensers Optical Service Corp (USA) |
NSN 6540-01-375-4090 is a Lens Blank,ophthalmic,sphere,sem, manufactured by Silor Optical of Florida Inc, classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
NSN 6540-01-375-4090 has 2 manufacturer part numbers on file: P0.50 BC (Silor Optical of Florida Inc), 0.50BC,SPHERE,CR-39,71MM (Dispensers Optical Service Corp).
Key specifications for P0.50 BC: Base Curve Diopter: 0.50 PLUS NOMINAL; Style Designator: ROUND-RECTANGULAR WITH ROUNDED CORNERS; Diameter: 71.0 MILLIMETERS NOMINAL MM; Cross-Sectional Shape Style: SPHERE. 11 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.