The Blocking Unit,ophthalmic Lens, cataloged under National Stock Number 6540-01-717-8439, 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 Dac Vision Incorporated. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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: EA.
| Parameter | Value |
|---|---|
| NSN | 6540-01-717-8439 |
| Primary Part Number | 01-051-338 |
| Item Name | Blocking Unit,ophthalmic Lens |
| FSC / FSG | 6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies |
| Manufacturer | Dac Vision Incorporated |
| 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 |
|---|---|
| 01-051-338 PRIMARY | Dac Vision Incorporated (USA) |
| Reference | Meaning |
|---|---|
| 1662945 | 5/1 Secondary reference U.S. Government activity |
| 6540NCM249585 | 5/1 Secondary reference Defense Medical Standardization Board |
NSN 6540-01-717-8439 is a Blocking Unit,ophthalmic Lens, manufactured by Dac Vision Incorporated, classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
NSN 6540-01-717-8439 has 1 manufacturer part number on file: 01-051-338 (Dac Vision Incorporated).
Key specifications for 01-051-338: Special Features: 3 BX SEMI-AUTOMATIC LENS FINISH BLOCKER. UTILIZES IMAGERY PROTECTION TO DISPLAY LENS IMAGE OVER THE LCD LAYOUT SCREEN. BLOCKING OPTIONS: GEOMETRIC CENTER, OPTICAL CENTER OR MANUAL PLACEMENT. HEADS UP DISPLAY. CAN BE CONFIGURED TO ANY METAL OR PLASTIC BLOCK DESIGN.; Part Name Assigned by Controlling Agency: 3 BX SEMI-AUTOMATIC LENS FINISH BLOCKER. 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.