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National Stock Number:
1240-01-081-5346
Federal Supply Class:
1240
National Item Identification Number:
010815346
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:
| 8211655 | 11934 | SEILER INSTRUMENT AND MANUFACTURING COMPANY, INCORPORATED | | 8211655 | 19200 | US ARMY ARDEC RDECOM |
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Techincal Specification:
| DIAMETER | 0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM | | MATERIAL | GLASS LOCATION NOT OTHERWISE SPECIFIED | | POLISHED PERIPHERY | PROVIDED | | POLISHED SURFACE | BOTH | | SPECIAL FEATURES | MATL: RED GLASS,TYPE III,SPEC MIL-F-12717; ELEMENT IN ACCORD WITH SPEC MIL-O-13830; SURFACE QUALITY 80-50; MAX WEDGE NOT TO EXCEED 15 MINUTES (0.250 DEG); RIM AND CHAMFERS GROUND; NOT TO EXCEED 0.010 (FACE WIDTH); USED ON AIMING CIRCLE M2A2 | | THICKNESS | 0.030 INCHES MINIMUM AND 0.040 INCHES MAXIMUM |
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