Model: 7645552

Optical Instrument Window

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

Properties:

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
Material
Glass, optical, mil-g-174, grade d, type 523-586
Material
Glass, optical, mil-g-174, grade d, type 523-586
NSN
1240-00-864-2936
Part Number
7645552
Description
Window,optical Instrument
CAGE
19200

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.

Part 7645552 NSN 1240-00-864-2936

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
10908
FIIG:
T271-F
Concept No.:
App. Key:
FA
Cond. Code:
2
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
A
ESD:
ESD:
MMAC:
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
1.7 X 1.7 X 0.3
Paclk Weight:
0.1000lbs
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
36
LVL_A:
Q
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
086700
UFC:
45955
LTL:
RATING VARIABLE
LCL:
65.0
WCC:
704
TCC:
Z
SHC:
9
ACC:
Construction Materials

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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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