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Spur Antibacklash Gear NSN 3020-00-020-3905

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 3020-00-020-3905 NSN: 3020-00-020-3905

Features and Characteristics

Pitch Diameter
1.2500 inches
Teeth Quantity
60
Bore Style
Plain both ends
Backlash Designation
Grade a
Outside Diameter
1.292 inches
Pressure Angle
14.5000 degrees
Face Width
0.063 inches
Bore Diameter
0.250 inches both ends
Hub Style Designator
Pinned first end
Precision Classification
Quality number 10 or quality number 11
Material
Steel comp 304
Material Specification
Qq-s-766 cond a fin 28 federal specification single material response
Surface Treatment
Passivate
Surface Treatment Specification
Cmc197-117, canadian marconi co mfr ref single treatment response
Style Designator
Protruding hub
FSC
3020 Transmission Chain Sprockets Pulleys Gears
NIIN
000203905
NSN
3020000203905

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
3318-508
Cage Code:
90073
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 3020-00-020-3905
What are the manufacturers of nsn 3020000203905?
Does this nsn 3020000203905 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 3020000203905
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 3020000203905 contain any precious metals?
Precious metal content is unknown.
Does nsn 3020000203905 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 3020000203905?
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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  •   Certificate of Conformance
  •   Quality Inspected Parts
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