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National Stock Number:
1240-01-291-7137
Federal Supply Class:
1240
National Item Identification Number:
012917137
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:
| 717511333-001 | 04939 | LOCKHEED MARTIN CORPORATION | | 717511336-009 | 04939 | LOCKHEED MARTIN CORPORATION | | 717511336-009 | 61999 | MB AEROSPACE STERLING HEIGHTS, INC. |
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Techincal Specification:
| APERTURE DIAMETER | 3.917 INCHES NOMINAL | | GROOVE DIAMETER | 4.180 INCHES NOMINAL | | GROOVE LOCATION | ADJACENT TO INTERNAL FLANGE | | INNER GROOVE WIDTH | 0.0500 INCHES NOMINAL | | INTERNAL FLANGE THICKNESS | 0.063 INCHES NOMINAL | | OUTSIDE DIAMETER | 4.290 INCHES NOMINAL | | OVERALL LENGTH | 0.450 INCHES NOMINAL | | SCREW THREAD SERIES DESIGNATOR | UNS | | THREAD CLASS | 2B | | THREAD DIRECTION | RIGHT-HAND | | THREAD PITCH DIAMETERS | +4.1313 TO 4.1700 INCHES | | THREAD LOCATION | INTERNAL | | THREAD SIZE | 4 11/64-28 |
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