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National Stock Number:
6540-00-926-4716
Federal Supply Class:
6540
National Item Identification Number:
009264716
Description:
LENS BLANK,OPHTHALMIC,BIFOCAL,SE
Detail:
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.
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Manufacturer Information:
| MILL16991 | 81349 | MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |
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Techincal Specification:
| ADDITIONAL POWER RATING IN DIOPTERS | 2.250 BIFOCAL | | BASE CURVE DIOPTER | 4.25 PLUS NOMINAL | | CROSS-SECTIONAL SHAPE STYLE | SPHERE | | DIAMETER | 54.0 MILLIMETERS MINIMUM AND 58.0 MILLIMETERS MAXIMUM | | LIGHT TRANSMISSION | UNTINTED | | MATERIAL | BARIUM FLINT GLASS BIFOCAL | | MATERIAL | GLASS SODA-LIME SINGLE VISION | | PART NAME ASSIGNED BY CONTROLLING AGENCY | LENS BLANK OPHTH BIFOCAL SEMIFINISHED GLASS+4.25 ADDL2.25DIOPTER | | READING SEGMENT DIAMETER | 25.0 MILLIMETERS NOMINAL | | READING SEGMENT HEIGHT | 17.5 MILLIMETERS NOMINAL | | NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND A CLASS | | STYLE DESIGNATOR | ROUND WITH STRAIGHT TOP BIFOCAL SEGMENT |
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