National Item Identification Number
00-762-8966
007628966
5210-00-762-8966
5210007628966
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)
77445
91141
DAVIDSON OPTRONICS INC
DBA DAVIDSON OPTRONICS, INC.
2223 W SAN BERNARDINO RD
WEST COVINA
CA
91790
626-962-5181
Reference Numbers (Part Numbers)
D617-10Q1S
D617-10Q1S
GG0635
Required Categories
DESIGN TYPE
MATERIAL
WORKING SURFACE FLATNESS ACCURACY
DIAMETER
THICKNESS
C
Required Description
REFERENCE SINGLE
QUARTZ, FUSED
0.00000010 INCHES NOMINAL
10.000 INCHES NOMINA