Model: 891638
Optical Element Retaining RingProperties:
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.
Part 891638 NSN 1240-01-258-2395
Material Classification
Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicatorsPackaging & Shipping
Freight Classification
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Schedule B and Export
- Schedule B: 9803200000
- SITC: 93100
- End Use: Military apparel and footwear
- NAICS: 990000
- USDA: 1
Freight Class: Military equipments not identified by kind
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