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National Stock Number:
1240-00-620-4979
Federal Supply Class:
1240
National Item Identification Number:
006204979
Description:
WINDOW,OPTICAL INSTRUMENT
Detail:
A COLOR FREE ITEM OF TRANSPARENT OR TRANSLUCENT MATERIAL, USUALLY OPTICAL GLASS, HAVING SPECIFIC LIGHT DISPERSIVE AND REFRACTIVE PROPERTIES. THIS ITEM MUST HAVE TWO PLANE-PARALLEL SURFACES AND IS DESIGNED FOR USE IN AN OPTICAL INSTRUMENT TO PROVIDE A BARRIER TO FOREIGN MATTER AND/OR PERMIT LIGHT TRANSMISSION IN OR TO THE OPTICAL SYSTEM.
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Manufacturer Information:
| 1240006204979 | A00AM | E.C.A ETABLISSEMENT CENTRAL DESAPPROVISIONNEMENTS DES FORCES ARMEE | | 8200495 | 03829 | GENERAL SCIENTIFIC CORP | | 8200495 | 19200 | US ARMY ARDEC RDECOM | | 8200495 | 32865 | DRS NETWORK & IMAGING SYSTEMS LLC |
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Techincal Specification:
| BEVEL ANGLE IN DEG | 42.000 MINIMUM AND 48.000 MAXIMUM | | BEVEL DEPTH | 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM | | DIAMETER | 2.022 INCHES MINIMUM AND 2.025 INCHES MAXIMUM | | DISPERSION | 64.500 ANGSTROMS NOMINAL | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-G-174, GRADE B, TYPE 517-645 MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED | | MATERIAL | GLASS OPTICAL LOCATION NOT OTHERWISE SPECIFIED | | POLISHED PERIPHERY | NOT PROVIDED | | POLISHED SURFACE | BOTH | | REFLECTION REDUCING SURFACE | BOTH | | REFRACTION INDEX | 1.5170 NOMINAL | | THICKNESS | 0.418 INCHES MINIMUM AND 0.458 INCHES MAXIMUM |
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