The Lens,ophthalmic,compound, cataloged under National Stock Number 6540-01-314-2644, 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 Welling Intl. Government technical data includes 9 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: PR.
| Parameter | Value |
|---|---|
| NSN | 6540-01-314-2644 |
| Primary Part Number | M3.25 SPHERE M1.50 CYL |
| Item Name | Lens,ophthalmic,compound |
| FSC / FSG | 6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies |
| Manufacturer | Welling Intl |
| Status | ACTIVE |
| Style Designator | ROUND |
| Diameter | 70.0 MILLIMETERS NOMINAL MM |
| Cross-Sectional Shape Style | SPHEROCYLINDER COMPOUND |
| Sphere Curve Inside Diopter | 3.25 MINUS NOMINAL |
| Light Transmission | UNTINTED |
| Material | GLASS OVERALL |
| Cross Curve Diopter | 0.00 PLANO NOMINAL |
| Cylinder Curve Inside Diopter | 1.50 MINUS NOMINAL |
| Thickness | 2.2 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 |
|---|---|
| M3.25 SPHERE M1.50 CYL PRIMARY | Welling Intl (USA) |
| Reference | Meaning |
|---|---|
| A89G448 | 5/1 Secondary reference Department of the Army U S Army Medical Material Agency Mcmr-Mmo-Sa |
| 89-8-15-273 | 5/1 Secondary reference Department of the Army U S Army Medical Material Agency Mcmr-Mmo-Sa |
NSN 6540-01-314-2644 is a Lens,ophthalmic,compound, manufactured by Welling Intl, classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
NSN 6540-01-314-2644 has 1 manufacturer part number on file: M3.25 SPHERE M1.50 CYL (Welling Intl).
Key specifications for M3.25 SPHERE M1.50 CYL: Style Designator: ROUND; Diameter: 70.0 MILLIMETERS NOMINAL MM; Cross-Sectional Shape Style: SPHEROCYLINDER COMPOUND; Sphere Curve Inside Diopter: 3.25 MINUS NOMINAL. 9 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.