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Spur Antibacklash Gear

NSN: 3020-00-104-4974 | Model: 803810-8
ITAR Registered seal

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 Properties and Flags
NATO Stock Number
Yes - ITAR Controlled
Attachment Method
Pitch Diameter
1.1458 inches
Teeth Quantity
Bore Style
Plain both ends
Outside Diameter
1.166 inches
Tooth Form
Pressure Angle
20.0000 degrees
Distance Between Body Face And Protruding Hub End
0.205 inches first end
Face Width
0.095 inches
Bore Diameter
0.090 inches both ends
Hub Style Designator
Split first end
Hub Diameter
0.188 inches first end
Clamping Surface Length
0.169 inches first end
Precision Classification
Quality number 10
Aluminum alloy 2024
Surface Treatment
Surface Treatment Specification
MIL-A-8625, type 1 military specification single treatment response
Style Designator
Protruding hub

Pricing and Availability

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NSN 3020-00-104-4974 Datasheet

Supply Class (FSC):
Transmission Chain Sprockets Pulleys Gears
Cross Reference:
  • 803810-8
  • 803810-8
  • 803810-8
  • 803810-8
  • 803810-8
  • 803810-8
Cage Codes:
  • Honeywell International Inc (CAGE 64547)
  • Honeywell International Inc. (CAGE 70210)
Schedule B & Trade:
  • Schedule B: 8483409000 (NAICS 333612)

    Gears and gearing, other than toothed wheels, chain sprockets and other transmission elements entered separately

  • SITC: 74840

    Gears and gearing; ball screws; gear boxes and other speed changers (including torque converters)

  • End Use: 21180

    Industrial machines, other


N - Indicates there is no data in the humors and the nsn is in a fsc not generally suspected of containing hazardous materials.


U - Precious metal content is unknown


- The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.

Freight Information:
  • NMFC:

    133300 - Machinery/machines noi

  • WCC:

    593 - Motors and parts, (machinery and parts),(less than 35 feet)

  • SHC:

    9 - Other or no special handling required (sh)

  • ADC:

    A - Shipment is not a consolidation and does not exceed 84 inches in any dimension.

  • ACC:

    V - Trailers, vehicles, machinery, shop and warehouse equipment and supplies including special tools and equipment, ground servicing

  • LTL:

    W - Rating variable

  • TCC:

    Z - No special type of cargo code applicable

NSN Management Codes:
  • SOS
  • AAC
  • Quantity per pack
  • Unit of Measure
  • Shelf Life
  • Classification Control
  • Repariability

Questions & Answers:

What are the historical prices recorded for this stock number?
Historical data shows pricing from $637.23 to $1,062.05..
Does NSN 3020-00-104-4974 have a shelf life?
No. There is no shelf life applicable for this NSN.
What NATO entities are users of this NSN?
Department Of The Navy
What is the NIIN of NSN 3020-00-104-4974?
001044974 or 00-104-4974
Does NSN 3020-00-104-4974 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 3020-00-104-4974?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Jun 19, 1968