9340-00-990-6549 WINDOW,OBSERVATION Index 3110-00-990-6562 BEARING,BALL,ANNULAR

National Stock Number:
1240-00-990-6559

Federal Supply Class:
1240

National Item Identification Number:
009906559

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.


Manufacturer Information:
1051425419200US ARMY ARDEC RDECOM
1240009906559A00AME.C.A ETABLISSEMENT CENTRAL DESAPPROVISIONNEMENTS DES FORCES ARMEE


Techincal Specification:
BEVEL ANGLE IN DEG45.000 NOMINAL
BEVEL DEPTH0.039 INCHES NOMINAL AND 0.118 INCHES NOMINAL
DIAMETER4.184 INCHES MINIMUM AND 4.188 INCHES MAXIMUM
DISPERSION64.5 ANGSTROMS NOMINAL
FSC APPLICATION DATAPERISCOPE,XM32,OPTICAL SIGHTING AND RANGING EQUIPMENT
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-174, CLASS 1, GRADE B, TYPE 517-645 MIL SPEC SINGLE MATERIAL RESPONSE
MATERIALGLASS OPTICAL
POLISHED PERIPHERYNOT PROVIDED
POLISHED SURFACEBOTH
REFLECTION REDUCING SURFACEBOTH
REFRACTION INDEX1.5170 NOMINAL
SPECIAL FEATURESLIGHT DEVIATION 3 MINUTES
SURFACE FINISHGROUND AND POLISHED
THICKNESS0.383 INCHES MINIMUM AND 0.393 INCHES MAXIMUM


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