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Spur Antibacklash Gear NSN 3020-00-713-8245

Item Description

An item having one fixed gear and one free gear, both having the same complement of spur gear teeth, mounted on a common hub. The free gear is attached to the fixed gear by springs and operates as one gear. Upon installation with the mating gear, the teeth of the free moving gear are preset to mesh with teeth other than those of the fixed gear. This spring tension between the fixed gear and the free gear eliminates any free motion between the driver and the driven gear. The gear is used where identical and accurate transmitted motion between gears is required.

NSN 3020-00-713-8245 NSN: 3020-00-713-8245

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Features and Characteristics

Attachment Method
Mounting hole
End Application
Guided missile, intercept
Pitch Diameter
4.0000 inches
Teeth Quantity
182
Bore Style
Plain both ends
Criticality Code Justification
Feat
Mounting Hole Type And Quantity
2 plain transversely through face
Outside Diameter
4.042 inches
Nominallength
0.380 inches
Tooth Form
Standard
Pressure Angle
20.0000 degrees
Distance Between Body Face And Protruding Hub End
0.113 inches first end
Face Width
0.182 inches
Bore Diameter
0.240 inches both ends
Hub Style Designator
Plain both ends
Hub Diameter
0.875 inches first end
Mounting Hole Diameter
0.406 inches transversely through face
Part Name Assigned By Controlling Agency
Gear assembly, spur, anti-backlash
Special Features
Mtg hols 180 degs apart; weapon system essential
Material
Aluminum alloy first gear
Material Specification
Qq-a-355, cond t3 federal specification single material response second gear
Surface Treatment
Passivate hub
Surface Treatment Specification
171, finish 7.1.1stdc1ljea171, finsish 7.1.1 military standard single treatment response first gear
Style Designator
Protruding hubs
FSC
3020 Transmission Chain Sprockets Pulleys Gears
NIIN
007138245
NSN
3020007138245

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
9053335
Cage Code:
18876
Status:
A
MSDS:
Part Number:
1293787-2
Cage Code:
55972
Status:
A
MSDS:

Foreign Trade & Schedule B

What is a Schedule B number? Find more information at help.cbp.gov
  • Schedule B Number: 8483409000
  • NAICS: 333612
  • SITC: 74840
  • Description: Gears and gearing, other than toothed wheels, chain sprockets and other transmission elements entered separately
  • End Use (Code 21180):
    Industrial machines, other

Q & A

Frequently asked questions for NSN 3020-00-713-8245
What are the manufacturers of nsn 3020007138245?
Does this nsn 3020007138245 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 3020007138245
An item having one fixed gear and one free gear, both having the same complement of spur gear teeth, mounted on a common hub. the free gear is attached to the fixed gear by springs and operates as one gear. upon installation with the mating gear, the teeth of the free moving gear are preset to mesh with teeth other than those of the fixed gear. this spring tension between the fixed gear and the free gear eliminates any free motion between the driver and the driven gear. the gear is used where identical and accurate transmitted motion between gears is required.
Does nsn 3020007138245 contain any precious metals?
Precious metal content is unknown.
Does nsn 3020007138245 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 3020007138245?
No known electrostatic discharge.

Identification Group

Item Identification Guide (IIG) and Item Name Code (INC)
INC
FIIG
App. Key
Cond. Code
Status
INC:
26668
FIIG:
A27300
App. Key:
AC
Cond. Code:
1
Status:
A

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