National Item Identification Number
00-203-5371
002035371
5210-00-203-5371
5210002035371
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)
91141
DAVIDSON OPTRONICS INC
DBA DAVIDSON OPTRONICS, INC.
2223 W SAN BERNARDINO RD
WEST COVINA
CA
91790
626-962-5181
18056
DO ALL INDUSTRIAL SUPPLY CORP.
4805 LEEDS AVENUE
BALTIMORE
MD
21227
800-923-6255
Reference Numbers (Part Numbers)
D-617-3Q1S
GG0635
3X5-8
Required Categories
DESIGN TYPE
MATERIAL
WORKING SURFACE FLATNESS ACCURACY
DIAMETER
THICKNESS
C
Required Description
REFERENCE SINGLE
QUARTZ, FUSED
0.00000100 INCHES NOMINAL
3.000 INCHES NOMINAL