National Item Identification Number
00-450-1700
004501700
6650-00-450-1700
6650004501700
National Stock Number
Item Name
WINDOW,OPTICAL INSTRUMENT
Federal Supply Class
6650
Description
A color free item of transparent or translucent material, usually optical glass, having specific light dispersive and refractive properties. This item must have two plane-parallel surfaces and is designed for use in an optical instrument to provide a barrier to foreign matter and/or permit light transmission in or to the optical system.
Commercial and Government Entity Code (Supplier Data)
89944
Reference Numbers (Part Numbers)
248578-17
Required Categories
MATERIAL
REFRACTION INDEX
DISPERSION
POLISHED SURFACE
POLISHED PERIPHERY
DI
Required Description
GLASS, OPTICAL, MIL-G-174, GRADE B, TYPE 517-642
1.5170 NOMINAL
64.2 ANGSTROMS