NSN 6540-00-142-8709
Part Details | SEMIFINISHED BIFOCAL OPHTHALMIC LENS BLANK
6540-00-142-8709 A transparent optical element consisting of a major blank and a bifocal segment. The blank and segment have been pressed in a glass mold to an approximate size and shape, and are ground and polished to a finished diopter curvature on one surface only.
Alternate Parts: MILL36460, 6540-00-142-8709, 00-142-8709, 6540001428709, 001428709
| Supply Group (FSG) | NSN Assigned | NIIN | Item Name Code (INC) |
|---|---|---|---|
| 65 | OCT 04, 1968 | 00-142-8709 | 30300 ( LENS BLANK, OPHTHALMIC, BIFOCAL, SEMIFINISHED ) |
REFERENCE DRAWINGS & PICTURES
SPHERE
ROUND WITH STRAIGHT TOP BIFOCAL SEGMENT
Cross Reference | NSN 6540-00-142-8709
| Part Number | Cage Code | Manufacturer |
|---|---|---|
| MILL36460 | 81349 | MILITARY SPECIFICATIONSPROMULGATED BY MILITARY |
Technical Data | NSN 6540-00-142-8709
| Characteristic | Specifications |
|---|---|
| STYLE DESIGNATOR | ROUND WITH STRAIGHT TOP BIFOCAL SEGMENT |
| DIAMETER | 65.0 MILLIMETERS MINIMUM |
| THICKNESS | 4.0 MILLIMETERS NOMINAL |
| READING SEGMENT DIAMETER | 25.0 MILLIMETERS NOMINAL |
| READING SEGMENT HEIGHT | 17.5 MILLIMETERS NOMINAL |
| MATERIAL AND LOCATION | GLASS, SODA-LIME SINGLE VISION AND GLASS, BARIUM BIFOCAL |
| LIGHT TRANSMISSION | TINTED |
| TINTED AREA LIGHT TRANSMITTANCE IN PERCENT | 31.0 |
| CROSS-SECTIONAL SHAPE STYLE | SPHERE |
| BASE CURVE DIOPTER | 8.25 PLUS NOMINAL |
| ADDITIONAL POWER RATING IN DIOPTERS | 1.500 BIFOCAL |
| NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND A CLASS |
| DEPARTURE FROM CITED DESIGNATOR | AS MODIFIED BY THICKNESS |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | LENS BLANK OPHTHALMIC SEMIFINISHED BIFOCAL PLUS 8.25 PLUS 1.50 |