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Optical Instrument Window NSN 1240-00-620-4979

Item Description

A color free item of transparent or translucent material, usually optical glass, having specific light dispersive and refractive properties. This item must have two plane-parallel surfaces and is designed for use in an optical instrument to provide a barrier to foreign matter and/or permit light transmission in or to the optical system.

NSN 1240-00-620-4979 NSN: 1240-00-620-4979

Features and Characteristics

Diameter
Between 2.022 inches and 2.025 inches
Thickness
Between 0.418 inches and 0.458 inches
Bevel Depth
Between 0.020 inches and 0.030 inches
Refraction Index
1.5170
Polished Surface
Both
Dispersion
64.500 angstroms
Reflection Reducing Surface
Both
Polished Periphery
Not provided
Bevel Angle In Deg
Between 42.000 and 48.000
Material
Glass, optical, mil-g-174, grade b, type 517-645
Material
Glass, optical, mil-g-174, grade b, type 517-645
FSC
1240 Optical Sighting And Ranging Equipment
NIIN
006204979
NSN
1240006204979

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
8200495
Cage Code:
03829
Status:
A
MSDS:
Part Number:
1240006204979
Cage Code:
A00AM
Status:
A
MSDS:

Foreign Trade & Schedule B

What is a Schedule B number? Find more information at help.cbp.gov
  • Schedule B Number: 9803200000
  • NAICS: 990000
  • SITC: 93100
  • Description: Military equipments not identified by kind
  • End Use (Code 50060):
    Military apparel and footwear

Q & A

Frequently asked questions for NSN 1240-00-620-4979
What are the manufacturers of nsn 1240006204979?
Does this nsn 1240006204979 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 1240006204979
A color free item of transparent or translucent material, usually optical glass, having specific light dispersive and refractive properties. this item must have two plane-parallel surfaces and is designed for use in an optical instrument to provide a barrier to foreign matter and/or permit light transmission in or to the optical system.
Does nsn 1240006204979 contain any precious metals?
Precious metal content is unknown.
Does nsn 1240006204979 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 1240006204979?
No known electrostatic discharge.

Identification Group

Item Identification Guide (IIG) and Item Name Code (INC)
INC
FIIG
App. Key
Cond. Code
Status
INC:
10908
FIIG:
T271-F
App. Key:
FA
Cond. Code:
2
Status:
A

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  •   On Time Delivery
  •   Certificate of Conformance
  •   Quality Inspected Parts
  •   Quality Fast Service
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