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Spur Antibacklash Gear NSN 3020-00-907-3438

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 3020-00-907-3438 NSN: 3020-00-907-3438

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Features and Characteristics

Attachment Method
Mounting hole
Pitch Diameter
1.4220 inches
Teeth Quantity
91
Mounting Hole Type And Quantity
1 threaded transversely through hub, first end
Outside Diameter
1.4530 inches
Nominallength
0.375 inches
Tooth Form
Standard
Pressure Angle
20.0000 degrees
Distance Between Body Face And Protruding Hub End
0.250 inches first end
Face Width
0.125 inches
Bore Diameter
0.250 inches both ends
Hub Diameter
0.375 inches first end
Special Features
1retainer, 1 setscrew, 2 springs
Material
Steel comp 303s
Material Specification
Mil-s-7720, comp 303s military specification single material response
Surface Treatment
Passivate
Style Designator
Protruding hub
FSC
3020 Transmission Chain Sprockets Pulleys Gears
NIIN
009073438
NSN
3020009073438

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
AB250-91-250SS
Cage Code:
01351
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 3020-00-907-3438
What are the manufacturers of nsn 3020009073438?
Does this nsn 3020009073438 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 3020009073438
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 3020009073438 contain any precious metals?
Precious metal content is unknown.
Does nsn 3020009073438 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 3020009073438?
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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