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Helical Antibacklash Gear NSN 3020-01-128-4681

Item Description

An item having one fixed gear and one free gear, both having the same complement of helical 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 3020-01-128-4681 NSN: 3020-01-128-4681

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Features and Characteristics

Attachment Method
Mounting hole
Pitch Diameter
0.4746 inches
Teeth Quantity
15
Bore Style
W/counterbore both ends
Mounting Hole Type And Quantity
2 plain axially through hub, first end
Outside Diameter
0.523 inches
Teeth Type
Single helix
Tooth Form
Standard
Tooth Direction
Left
Pressure Angle
20.0000 degrees
Helix Angle
9.0000 degrees
Distance Between Body Face And Protruding Hub End
0.015 inches both ends
Face Width
0.405 inches
Bore Diameter
0.220 inches both ends
Counterbore Depth
0.015 inches both ends
Counterbore Diameter
0.220 inches both ends
Hub Style Designator
Plain both ends
Hub Diameter
0.365 inches both ends
Precision Classification
Quality number 6 or quality number 7
Mounting Hole Diameter
0.045 inches axially through hub, first end
Bolt Hole Circle Diameter
0.290 inches axially through hub, first end
Material
Plastic polyhexamethylene adipamide
Material Specification
L-p-410 federal specification single material response
Style Designator
Protruding hubs
FSC
3020 Transmission Chain Sprockets Pulleys Gears
NIIN
011284681
NSN
3020011284681

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
42735P2
Cage Code:
25734
Status:
A
MSDS:
Part Number:
42735
Cage Code:
25734
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 3020-01-128-4681
What are the manufacturers of nsn 3020011284681?
Does this nsn 3020011284681 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 3020011284681
An item having one fixed gear and one free gear, both having the same complement of helical 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 3020011284681 contain any precious metals?
No precious metal content.
Does nsn 3020011284681 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 3020011284681?
No known electrostatic discharge.

Identification Group

Item Identification Guide (IIG) and Item Name Code (INC)
INC
FIIG
App. Key
Cond. Code
Status
INC:
26667
FIIG:
A27300
App. Key:
AB
Cond. Code:
1
Status:
A

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