The Blocks,optical Fabr, cataloged under National Stock Number 6540-01-451-7996, 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 Coburn Technologies, Inc.. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: PG.
| Parameter | Value |
|---|---|
| NSN | 6540-01-451-7996 |
| Primary Part Number | 170421 |
| Item Name | Blocks,optical Fabr |
| FSC / FSG | 6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies |
| Manufacturer | Coburn Technologies, Inc. |
| Status | ACTIVE |
| General Characteristics Item Description | BLOCKS, OPTICAL FABRICATION; 4 DIOPTER BASE CURVE; FOR USE IN BLOCKING OPTICAL LENSES WITH THE GERBER STEP ONE SYSTEM; UNIT PKG QTY: 10 BLOCKS |
| 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 | PG |
| Part Number | Manufacturer |
|---|---|
| 170421 PRIMARY | Coburn Technologies, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 97-0863 | 5/1 Secondary reference U.S. Government activity |
| GEBER ONE STEP 4 DIOPTER BC | 5/9 Secondary reference Gerber Coburn Optical, Inc |
| 170421 | 5/9 Secondary reference Gerber Coburn Optical, Inc |
NSN 6540-01-451-7996 is a Blocks,optical Fabr, manufactured by Coburn Technologies, Inc., classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
NSN 6540-01-451-7996 has 1 manufacturer part number on file: 170421 (Coburn Technologies, Inc.).
Key specifications for 170421: General Characteristics Item Description: BLOCKS, OPTICAL FABRICATION; 4 DIOPTER BASE CURVE; FOR USE IN BLOCKING OPTICAL LENSES WITH THE GERBER STEP ONE SYSTEM; UNIT PKG QTY: 10 BLOCKS; Part Name Assigned by Controlling Agency: BLOCKS OPTICAL FABR4 DIOPTER BASE CURVE U/W GERBER ONE STEP. 1 specification is 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.