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National Stock Number:
1240-01-171-8377
Federal Supply Class:
1240
National Item Identification Number:
011718377
Description:
RING,RETAINING,OPTICAL ELEMENT
Detail:
A CYLINDRICAL ITEM HAVING AN INTERNALLY FLANGED DIAMETER DESIGNED TO RETAIN A LENS OR WINDOW IN THE OBJECTIVE END, OR A DIOPTER SCALE AT THE VIEWING END OF AN OPTICAL INSTRUMENT. IT MAY HAVE ONE OR MORE OF THE FOLLOWING CHARACTERISTICS: INTERNAL THREAD OR MACHINED FOR A PRESS FIT, METHOD OF SECURING, AND/OR KNURLED PERIPHERY. FOR EXTERNALLY THREADED ITEMS, SEE RETAINER, OPTICAL ELEMENT. EXCLUDES CELL, OPTICAL ELEMENT; NUT, PLAIN KNURLED; NUT, PLAIN ROUND; AND RING, RETAINING.
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Manufacturer Information:
| 13075287 | 04939 | LOCKHEED MARTIN CORPORATION | | 13075287 | 58260 | PROGRAM MANAGER ADVANCED ATTACK HELICOPTER BARCOM AMCPM-AAH |
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Techincal Specification:
| APERTURE DIAMETER | 4.277 INCHES NOMINAL | | GROOVE DIAMETER | 4.820 INCHES NOMINAL | | GROOVE LOCATION | INSIDE END OF THREAD | | INNER GROOVE WIDTH | 0.050 INCHES NOMINAL | | INTERNAL FLANGE THICKNESS | 0.543 INCHES NOMINAL | | OUTSIDE DIAMETER | 5.020 INCHES NOMINAL | | OVERALL LENGTH | 1.250 INCHES NOMINAL | | MATERIAL | ALUMINUM ALLOY | | SCREW THREAD SERIES DESIGNATOR | UNS | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 2B | | THREAD LENGTH | 0.680 INCHES | | THREAD LOCATION | INTERNAL | | THREAD PITCH DIAMETERS | +4.7297 TO 4.7358 INCHES | | THREAD SIZE | 4 3/4-32 |
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