National Item Identification Number
01-039-2856
010392856
5855-01-039-2856
5855010392856
National Stock Number
Item Name
RING,RETAINING,OPTICAL ELEMENT
Federal Supply Class
5855
Description
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.
Commercial and Government Entity Code (Supplier Data)
80063
Reference Numbers (Part Numbers)
SM-D-850425
SM-D-850425
SM-D-850425
Required Categories
MATERIAL
SURFACE TREATMENT
THREAD LOCATION
THREAD SIZE
SCREW THREAD SERIES D
Required Description
ALUMINUM ALLOY, 6061
DULL BLACK
INTERNAL
7/40-18
UNS
2B
3.1389 TO 3.1459 I