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Optical Instrument Window NSN 1240-00-171-4178

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 1240-00-171-4178 NSN: 1240-00-171-4178

Features and Characteristics

Diameter
Between 50.950 millimeters and 51.000 millimeters
Thickness
Between 5.800 millimeters and 6.200 millimeters
Bevel Depth
0.750 millimeters
Refraction Index
1.5170
Polished Surface
Both
Dispersion
64.5 angstroms
Reflection Reducing Surface
Both
Polished Periphery
Not provided
Bevel Angle In Deg
45.000
Material
Glass, optical, jan-g-174, type 517-645, grade b
Material
Glass, optical, jan-g-174, type 517-645, grade b
Fsc Application Data
Telescope mk 102 mod 3
FSC
1240 Optical Sighting And Ranging Equipment
NIIN
001714178
NSN
1240001714178

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
1040155
Cage Code:
10001
Status:
A
MSDS:
Part Number:
52476
Cage Code:
21587
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 1240-00-171-4178
What are the manufacturers of nsn 1240001714178?
Does this nsn 1240001714178 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 1240001714178
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 1240001714178 contain any precious metals?
No precious metal content.
Does nsn 1240001714178 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 1240001714178?
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
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