Optical Instrument Window

(NSN) National Stock Number
1240-00-530-0735
Federal Supply Classification
1240 Optical Sighting and Ranging Equipment
Item Name Code
10908
Schedule B Code
9803200000
Summary

22.802 millimeters minimum and 23.000 millimeters maximum diameter, 3.9542 millimeters minimum and 4.0457 millimeters maximum thickness, 1.5230 nominal refraction index, both polished surface, 58.6 angstroms nominal dispersion, both reflection reducing surface

DAC HCC DMIL RNCC
X - - 3
RNVC SADC MSDS RNAAC
2 - - XX
Identification

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.

INC FIIG Concept Condition
10908 T271-F - 2
Specifications
Diameter
22.802 millimeters minimum and 23.000 millimeters maximum
Details The length of a straight line which passes through the center of a circular figure or body,and terminates at the circumference.
Thickness
3.9542 millimeters minimum and 4.0457 millimeters maximum
Details A measurement of the smallest dimension of an item,in distinction from length or width.
Refraction Index
1.5230 nominal
Details An indication of the ratio of the speed of light in the first medium to its speed in the second medium.
Polished Surface
both
Details An indication of the polished surface/s/ on the item.
Dispersion
58.6 angstroms nominal
Details The variation of the refractive index of the item.
Reflection Reducing Surface
both
Details An indication of the surface/s/ treated with reflection reducing film.
Polished Periphery
not provided
Details An indication of whether or not a polished periphery is provided.
Material
glass optical
Details The chemical compound or mechanical mixture properties of which the item is fabricated.
Material Document And Classification
jan-g-174, type 523-586, grade a mil spec single material response
Details The specification, standard, or manufacturer's reference and the classification designation, such as class, condition, temper, and the like, that identifies the material.
Fsc Application Data
rangefinder mk 63
Details The justification for the assignment of a federal supply class /fsc/ to an item based on the classification of the next higher classifiable assembly.
Material and Special Handling
Hazardous material, precious metals, criticality, and electrostatic discharge indicators.
HMIC PMIC ESD/EMI Criticality
N A - -
Freight
Universal / National Freight and Handling Information
UFC HMC LTL LCL
46000 - Q -
RVC WCC TCC SHC
- 744 Z 9
Price and Availability Quote

Send us a quick request for quote using the form below:

Provided with every order

Order with confidence, we are a valued certified supplier serving customers in the military and aerospace industries.

  • Counterfeit Parts Prevention
  • 100% Product Inspections
  • 7 Year Record Retention
  • On Time Delivery
  • HAZMAT Certified
  • Worldwide Shipping
FAQs
Frequently asked questions for NSN 1240-00-530-0735
What is the NIIN of the NSN 1240-00-530-0735?
The National Item Identification Number (NIIN) of the NSN 1240-00-530-0735 is 00-530-0735
When the NSN 1240-00-530-0735 was assigned to the Federal Catalog?
It was assigned 62 years ago, on Tue, Jan 1, 1963
Does the NSN 1240-00-530-0735 contain any precious metals?
Does not contain precious metal
Does the NSN 1240-00-530-0735 contain any hazardous material?
No data in HMIRS

Can't Find It

If you didn't find what you need, don't worry, we're here to help! Our team is ready to help you find exactly what you need. Click below to contact us.

Who we are?

At our core, we specialize in sourcing and supplying high-quality NSN (National Stock Number) parts to industries that demand precision and reliability.

From aerospace and defense to manufacturing and logistics, we provide the essential components that keep critical systems running.

Contact
350 Tenth Ave
San Diego, CA, 92101
United States
© 2025 National Stock Number (NSN) Parts Store, Inc. All rights reserved.
Made in USA