7688771
View detailed technical data, stock status, and sourcing information for: 7688771
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A cylindrical item having an internally flanged diameter designed to retain a lens or window in the objective end, or a diopter scale at the viewing end of an optical instrument. It may have one or more of the following characteristics: internal thread or machined for a press fit, method of securing, and/or knurled periphery. For externally threaded items, see retainer, optical element. Excludes:cell, optical element; nut, plain knurled; nut, plain round; and ring, retaining.
1.097 inches minimum and 1.100 inches maximum diameter, 0.241 inches minimum and 0.251 inches maximum axial thickness, -0.927 inches equivalent focal length, -0.961 inches back focal length, 1.6890 nominal refraction index
Product Characteristics
Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.
- Diameter
- 1.097 inches minimum and 1.100 inches maximum
- Axial Thickness
- 0.241 inches minimum and 0.251 inches maximum
- Equivalent Focal Length
- -0.927 inches
- Back Focal Length
- -0.961 inches
- Refraction Index
- 1.6890 nominal
- Abbe Constant
- 30.900
- Single Lens Style
- double concave
- Element Left Surface Radius
- 2.774 inches
- Element Right Surface Radius
- 0.860 inches
- Special Features
- left surface edge chamfer 0.010 to 0.020 in. by 45 deg. right surface edge chamfer 0.050 to 0.060 in. by 45 deg. both surfaces coated with magnesium fluoride. rim and chamfers ground.
- Material
- glass optical
- Material Document And Classification
- mil-g-174, grade c, type 689-309 mil spec single material response
- Fsc Application Data
- periscope,tank
Related Parts
This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:
| Part Number | Name |
|---|---|
| 7688771 | Optical Instrument Lens |
FAQs
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What is the FSCG of the NSN 6650-00-768-8771?
Does the NSN 6650-00-768-8771 have a Schedule B code assigned?
Does NSN 6650-00-768-8771 require demilitarization?
Does NSN 6650-00-768-8771 contain precious materials?
Does NSN 6650-00-768-8771 contain hazardous materials?
When the NSN 6650-00-768-8771 was assigned to the Federal Catalog?
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