No other part numbers with same form, fit, and function found.
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.
NSN 5910-00-959-3966
NSN 6145-01-410-9098
NSN 6240-01-144-5478
NSN 7035-00-631-3782
NSN 5998-01-252-8369
NSN 5960-01-313-0681
NSN 6610-00-491-8165
NSN 6240-00-756-5149
NSN 5950-01-480-9164
NSN 6610-01-448-2335
NSN 6650-00-617-3436
NSN 5985-00-237-7321