The Magnifier,eyepiece, cataloged under National Stock Number 6540-01-574-5740, 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 Patterson Veterinary Supply, Inc. Div Patterson Veterinary Supply. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 6540-01-574-5740 |
| Primary Part Number | 07-803-3553 |
| Item Name | Magnifier,eyepiece |
| FSC / FSG | 6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies |
| Manufacturer | Patterson Veterinary Supply, Inc. Div Patterson Veterinary Supply |
| Status | ACTIVE |
| 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 | EA |
| Part Number | Manufacturer |
|---|---|
| 07-803-3553 PRIMARY | Patterson Veterinary Supply, Inc. Div Patterson Veterinary Supply (USA) |
| OPTIVISOR DA-5 | Patterson Veterinary Supply, Inc. Div Patterson Veterinary Supply (USA) |
| Reference | Meaning |
|---|---|
| 12345 | 5/1 Secondary reference U.S. Government activity |
| 6540NCM093544 | 5/1 Secondary reference Defense Medical Standardization Board |
NSN 6540-01-574-5740 is a Magnifier,eyepiece, manufactured by Patterson Veterinary Supply, Inc. Div Patterson Veterinary Supply, classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
NSN 6540-01-574-5740 has 2 manufacturer part numbers on file: 07-803-3553 (Patterson Veterinary Supply, Inc. Div Patterson Veterinary Supply), OPTIVISOR DA-5 (Patterson Veterinary Supply, Inc. Div Patterson Veterinary Supply).
1 possible match (shared part number, not a government interchangeability claim): 4720-01-591-4192. Verify interchangeability with system specifications before substitution.
Key specifications for 07-803-3553: Special Features: GLASS LENSES FRAME MOUNTED; DESIGNED FOR CLOSE WORK; CAN BE WORN OVER GLASSES OR ALONE; FITS OVER THE HEAD; MAGNIFICATION 2.5X; Part Name Assigned by Controlling Agency: MAGNIFIER EYEPIECE 2.5X OPTIVISOR DA-5. 0 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.