National Item Identification Number
01-288-5484
012885484
6650-01-288-5484
6650012885484
National Stock Number
Item Name
RETAINER,OPTICAL ELEMENT
Federal Supply Class
6650
Description
A cylindrical, externally threaded item having a centrally located hole specifically designed to retain by means of either a raised box (shoulder), or counterbore, countersink, or a similar shaped recess, an optical element such as a lens, reticle, cell, and the like, in optical assemblies. It must have drilled holes or slots to facilitate assembly and disassembly. For items which house the optical element(s), and form the internal or central portions of an optical system, see CELL, OPTICAL ELEMENT. Excludes RING, EXTERNALLY THREADED.
Commercial and Government Entity Code (Supplier Data)
53711
Reference Numbers (Part Numbers)
5525882
Required Categories
OVERALL LENGTH
THREAD SIZE
MATERIAL
SURFACE TREATMENT
SPECIAL FEATURES
III
Required Description
0.250 INCHES NOMINAL
3.438 IN-20
BRASS
BLACK OXIDE, MIL-F-495
125 MICROINCH