National Item Identification Number
01-423-9340
014239340
5210-01-423-9340
5210014239340
National Stock Number
Item Name
OPTICAL FLAT
Federal Supply Class
5210
Description
A flat, transparent piece of glass, generally of fused quartz, with one or both principal surfaces polished to within a few millionths of an inch of a true plane. It is used in conjunction with a monochromatic light source to measure the flatness of precision finished surfaces, and to determine the distance and parallelism between precision finished surfaces by comparison with known standards. In operation the flat is superimposed, reference surface downward, on the parts under test and when illuminated by monochromatic light the rays reflected from the reference surface are either reinforced or neutralized by the rays reflected from the surface under test producing interference bands which reveal any variations in the thickness of the film of air between surface under test and the flat. Excludes optical parallels.
Commercial and Government Entity Code (Supplier Data)
34860
LITTON SYSTEMS INC
DBA LASER SYSTEMS DIV LASER SYSTEMS
2787S ORANGE BLOSSOM TRL
547300 ORLANDO FL 32854
APOPKA
FL
32703
321-354-3718
Reference Numbers (Part Numbers)
60710139-9
Required Categories
III END ITEM IDENTIFICATION
Required Description
OH-58D AHIP (ARMY HELICOPTER IMPROVEMENT PROGRAM), ROTARY WING AIRCRAFT