Optical Instrument Window

Features

Specifications

• Diameter:
  Between 55.515 inches and 55.520 inches
• Thickness:
  Between 13.200 millimeters and 13.600 millimeters
• Surface Finish:
  Polished
• Bevel Depth:
  1.500 millimeters
• Refraction Index:
  Between 1.5150 and 1.5190
• Polished Surface:
  Both
• Dispersion:
  Between 64.000 angstroms and 65.000 angstroms
• Polished Periphery:
  Provided
• Bevel Angle In Deg:
  45.000
• Material:
  Glass, optical, jan-g-174, type 517-645, grade c
• Fsc Application Data:
  Telescope mk 90 mod 0
• Federal Supply Class (fsc):
  Optical instruments, test equipment, components and accessories
• National Stock Number (nsn):
  6650-00-800-4092