1240-00-864-2930 TELESCOPE,PANORAMIC Index 1240-00-864-2932 RETAINER,OPTICAL ELEMENT

National Stock Number:
1240-00-864-2931

Federal Supply Class:
1240

National Item Identification Number:
008642931

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:
766043919200US ARMY ARDEC RDECOM


Techincal Specification:
BEVEL ANGLE IN DEG42.000 MINIMUM AND 48.000 MAXIMUM
BEVEL DEPTH0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM
DISPERSION64.5 ANGSTROMS NOMINAL
FSC APPLICATION DATATELESCOPE,PANORAMIC
LENGTH1.557 INCHES MINIMUM AND 1.562 INCHES MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-174, CLASS 1, GRADE C, TYPE 517-645 MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED
MATERIALGLASS OPTICAL LOCATION NOT OTHERWISE SPECIFIED
SPECIAL FEATURESALL CORNERS WITH A 0.310 IN. RADIUS
POLISHED SURFACEBOTH
POLISHED PERIPHERYNOT PROVIDED
REFLECTION REDUCING SURFACEBOTH
REFRACTION INDEX1.5170 NOMINAL
THICKNESS0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM
WIDTH0.990 INCHES MINIMUM AND 1.000 INCHES MAXIMUM


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