The Lens Blank,ophthalmic,bifocal,se, cataloged under National Stock Number 6540-01-375-8459, 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 10 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. Current acquisition status: Active. Unit of issue: PR.
| Parameter | Value |
|---|---|
| NSN | 6540-01-375-8459 |
| Primary Part Number | P4.50 BC, P1.50 ADD 35 FT |
| Item Name | Lens Blank,ophthalmic,bifocal,se |
| FSC / FSG | 6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies |
| Manufacturer | Silor Optical of Florida Inc |
| Status | ACTIVE |
| Base Curve Diopter | 4.50 PLUS NOMINAL |
| Additional Power Rating in Diopters | 1.500 BIFOCAL |
| Style Designator | ROUND WITH STRAIGHT TOP BIFOCAL SEGMENT |
| Diameter | 71.0 MILLIMETERS NOMINAL MM |
| Cross-Sectional Shape Style | SPHERE |
| Reading Segment Diameter | 35.0 MILLIMETERS NOMINAL MM |
| Light Transmission | UNTINTED |
| Material | PLASTIC OVERALL |
| Reading Segment Height | 22.0 MILLIMETERS NOMINAL MM |
| Thickness | 11.0 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 |
|---|---|
| P4.50 BC, P1.50 ADD 35 FT PRIMARY | Silor Optical of Florida Inc (USA) |
NSN 6540-01-375-8459 is a Lens Blank,ophthalmic,bifocal,se, manufactured by Silor Optical of Florida Inc, classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
NSN 6540-01-375-8459 has 1 manufacturer part number on file: P4.50 BC, P1.50 ADD 35 FT (Silor Optical of Florida Inc).
Key specifications for P4.50 BC, P1.50 ADD 35 FT: Base Curve Diopter: 4.50 PLUS NOMINAL; Additional Power Rating in Diopters: 1.500 BIFOCAL; Style Designator: ROUND WITH STRAIGHT TOP BIFOCAL SEGMENT; Diameter: 71.0 MILLIMETERS NOMINAL MM. 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.