National Item Identification Number

00-789-8178
007898178
6650-00-789-8178
6650007898178

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)

2493663
2493663

Required Categories

MATERIAL
SURFACE TREATMENT
THREAD LOCATION
OUTSIDE DIAMETER
INTERNAL FLANGE

Required Description

ALUMINUM ALLOY
ANODIZED, MIL-A-8625, TYPE 2
EXTERNAL
3.250 INCHES NOMINAL
0.