Spur Antibacklash Gear NSN 3020-00-020-3954

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: 3020-00-020-3954

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Features and Characteristics

Attachment Method

Mounting hole

Pitch Diameter

1.2500 inches

Teeth Quantity

Bore Style

Plain both ends

Backlash Designation

Grade a

Mounting Hole Thread Series Designator

Unc axially through hub, second end

Mounting Hole Thread Size

0.086 inches axially through hub, second end

Mounting Hole Type And Quantity

1 threaded axially through hub, second end

Outside Diameter

1.276 inches

Tooth Form

Standard

Pressure Angle

20.0000 degrees

Distance Between Body Face And Protruding Hub End

0.032 inches second end

Face Width

0.062 inches

Bore Diameter

0.090 inches both ends

Hub Style Designator

Plain second end

Hub Diameter

0.257 inches second end

End Length

0.138 inches first end

Precision Classification

Quality number 10 or quality number 11

End Diameter

0.245 inches first end

First Step Length

0.031 inches first end

First Step Diameter

0.625 inches first end

Material

Steel comp 303 hub

Material Specification

Qq-s-766, cond a federal specification single material response hub

Surface Treatment

Passivate

Style Designator

Protruding hubs

FSC

3020 Transmission Chain Sprockets Pulleys Gears

NIIN

000203954

NSN

3020000203954

Manufacturer Part Numbers

Part numbers registered to this national stock number.

Part Number

Cage

Status

MSDS

Part Number:

3157-346

Cage Code:

90073

Status:

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 3020-00-020-3954

What are the manufacturers of nsn 3020000203954?

Cmc Electronics Inc (90073)

Does this nsn 3020000203954 have a shelf life?
No. This NSN does not have an applicable shelf life.

What is the formal definition of nsn 3020000203954
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 3020000203954 contain any precious metals?
Precious metal content is unknown.

Does nsn 3020000203954 contain any hazardous materials?
No MSDS. No hazardous material.

What is the ESD classification of nsn 3020000203954?
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:

Cond. Code:

Status:

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Certificate of Conformance
Quality Inspected Parts
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