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Optical Instrument Window NSN 1240-00-864-2936

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 1240-00-864-2936 NSN: 1240-00-864-2936

Features and Characteristics

Diameter
Between 1.740 inches and 1.745 inches
Thickness
Between 0.240 inches and 0.250 inches
Surface Finish
Ground and polished
Bevel Depth
Between 0.020 inches and 0.030 inches
Polished Surface
Both
Polished Periphery
Provided
Bevel Angle In Deg
Between 42.000 and 48.000
Special Features
Element in accord with specification mil-o-13830; spherical power not to exceed 3 fringes, astigmatism 2 fringes; light deviation not to exceed 2 minutes (0.033 deg) of arc; surfaces quali type 80-50; used on periscope and howitzers m109a2 and m109a3
Material
Glass, optical, mil-g-174, grade d, type 523-586
Material
Glass, optical, mil-g-174, grade d, type 523-586
FSC
1240 Optical Sighting And Ranging Equipment
NIIN
008642936
NSN
1240008642936

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
7645552
Cage Code:
19200
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 1240-00-864-2936
What are the manufacturers of nsn 1240008642936?
Does this nsn 1240008642936 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 1240008642936
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 1240008642936 contain any precious metals?
No precious metal content.
Does nsn 1240008642936 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 1240008642936?
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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