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Optical Element Retaining Ring NSN 1240-00-931-8901

Item Description

A cylindrical item having an internally flanged diameter designed to retain a lens or window in the objective end, or a diopter scale at the viewing end of an optical instrument. It may have one or more of the following characteristics: internal thread or machined for a press fit, method of securing, and/or knurled periphery. For externally threaded items, see retainer, optical element. Excludes cell, optical element; nut, plain knurled; nut, plain round; and ring, retaining.

NSN 1240-00-931-8901 NSN: 1240-00-931-8901

Features and Characteristics

Thread Class
3b
Thread Direction
Right-hand
Groove Diameter
Between 1.322 inches and 1.330 inches
Thread Length
0.200 inches
Overall Length
Between 0.340 inches and 0.341 inches
Outside Diameter
Between 1.377 inches and 1.385 inches
Thread Size
1.312 in.-48
Aperture Diameter
Between 0.880 inches and 0.920 inches
Inner Groove Width
Between 0.050 inches and 0.070 inches
Screw Thread Series Designator
Uns
Thread Location
Internal
Internal Flange Thickness
Between 0.060 inches and 0.080 inches
Groove Location
Adjacent to internal flange
Knurled Periphery
Not provided
Special Features
Drilled face drive type, two 0.077 in. Dia. Holes spaced 180 degrees apart on a 1.156 in. Bolt circle dia. On internal flange end.
Material
Brass, qq-b-626, comp 360, 1/2h
Material
Brass, qq-b-626, comp 360, 1/2h
Surface Treatment
Black oxide, mil-f-495
Surface Treatment
Black oxide, mil-f-495
Fsc Application Data
Sight, reflex
FSC
1240 Optical Sighting And Ranging Equipment
NIIN
009318901
NSN
1240009318901

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
7791929
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 1240-00-931-8901
What are the manufacturers of nsn 1240009318901?
Does this nsn 1240009318901 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 1240009318901
A cylindrical item having an internally flanged diameter designed to retain a lens or window in the objective end, or a diopter scale at the viewing end of an optical instrument. it may have one or more of the following characteristics: internal thread or machined for a press fit, method of securing, and/or knurled periphery. for externally threaded items, see retainer, optical element. excludes cell, optical element; nut, plain knurled; nut, plain round; and ring, retaining.
Does nsn 1240009318901 contain any precious metals?
No precious metal content.
Does nsn 1240009318901 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 1240009318901?
No known electrostatic discharge.

Identification Group

Item Identification Guide (IIG) and Item Name Code (INC)
INC
FIIG
App. Key
Cond. Code
Status
INC:
22585
FIIG:
T271-J
App. Key:
JC
Cond. Code:
2
Status:
A

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  •   Certificate of Conformance
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