National Item Identification Number

01-285-3385
012853385
6650-01-285-3385
6650012853385

National Stock Number

Item Name

RING,RETAINING,OPTICAL ELEMENT

Federal Supply Class

6650

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)

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53711

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Reference Numbers (Part Numbers)

5525872

Required Categories

MATERIAL
SURFACE TREATMENT
THREAD LOCATION
THREAD SIZE
SCREW THREAD SERIES D

Required Description

BRASS
BLACK OXIDE, MIL-F-495
EXTERNAL
1 23/32-20
UNS
3A
1.6826 TO 1.6862 I