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National Stock Number:
1240-00-864-2936
Federal Supply Class:
1240
National Item Identification Number:
008642936
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:
| 7645552 | 19200 | US ARMY ARDEC RDECOM |
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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 | 1.740 INCHES MINIMUM AND 1.745 INCHES MAXIMUM | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-G-174, GRADE D, TYPE 523-586 MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED | | MATERIAL | GLASS OPTICAL LOCATION NOT OTHERWISE SPECIFIED | | POLISHED PERIPHERY | PROVIDED | | POLISHED SURFACE | BOTH | | SPECIAL FEATURES | ELEMENT IN ACCORD WITH SPEC MIL-O-13830; SPHERICAL POWER NOT TO EXCEED 3 FRINGES,ASTIGMATISM 2 FRINGES; LIGHT DEVIATION NOT TO EXCEED 2 MINUTES (0.033 DEG) OF ARC; SURFACES QUALITY 80-50; USED ON PERISCOPE AND HOWITZERS M109A2 AND M109A3 | | SURFACE FINISH | GROUND AND POLISHED | | THICKNESS | 0.240 INCHES MINIMUM AND 0.250 INCHES MAXIMUM |
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