Spur Antibacklash Gear

NSN: 3020-00-020-3905 | Model: 3318-508

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

3020-00-020-3905

DEMIL

Pitch Diameter

1.2500 inches

Teeth Quantity

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

Pricing and Availability

Send us a request for quote using the form below. Our team will contact you with an up to date pricing and availability quote ASAP.

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NSN 3020-00-020-3905 Datasheet

Supply Class (FSC):

Transmission Chain Sprockets Pulleys Gears

Cross Reference:

3318-508

Cage Codes:

Cmc Electronics Inc (CAGE 90073)

Replacements:

3020-00-020-3905 replaces 3020-00-019-9773

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

Identification:

HMIC

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

PMIC

U - Precious metal content is unknown

CRITL

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

Freight Information:

NMFC:

197339 - Wheels cog/gear/pinion i/s
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:

B - Construction materials: includes paint and related materials, prefabricated building, wood products, metal and composition mater
LTL:

R - 65.0
TCC:

Z - No special type of cargo code applicable

Questions & Answers:
What are the historical prices recorded for this stock number?
No pre-dated pricing for this NSN could be found.
Does NSN 3020-00-020-3905 have a shelf life?
No. There is no shelf life applicable for this NSN.
What NATO entities are users of this NSN?
Portugal, and Norway
What is the NIIN of NSN 3020-00-020-3905?
000203905 or 00-020-3905
Does NSN 3020-00-020-3905 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 3020-00-020-3905?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Jan 01, 1963