Model: 20178-3

Spur Antibacklash Gear

Special Features:

Two threaded mtg holes located hub between hub end and gear face 90 degrees apart; unc thread series; mtg hole nom thd size 0.112 in.; 40 thds per in.

Properties:

Attachment Method
Mounting hole
Pitch Diameter
0.9375 inches
Teeth Quantity
60
Bore Style
Plain both ends
Outside Diameter
0.9688 inches
Nominallength
0.375 inches
Tooth Form
Standard
Pressure Angle
20.0000 degrees
Distance Between Body Face And Protruding Hub End
0.250 inches first end
Face Width
0.125 inches
Bore Diameter
0.250 inches both ends
Hub Style Designator
Pinned first end
Hub Diameter
0.375 inches first end
Precision Classification
Quality number 10 or quality number 11
Material
Aluminum alloy 2024 body
Material
Steel comp 302 hub or steel comp 303 hub or steel comp 303se hub or steel comp 316 hub
Material
Steel comp 302 or steel comp 303 or steel comp 303se or steel comp 316 hub
Material Specification
Mil-s-7720 military specification all material responses hub
Material Specification
Qq-a-225/6 federal specification single material response body
Surface Treatment
Anodize body
Surface Treatment
Passivate hub
Surface Treatment Specification
Mil-a-8625 military specification single treatment response body
Surface Treatment Specification
Mil-f-14072, finish e300 military specification single treatment response hub
Style Designator
Protruding hub
NSN
3020-00-455-1225
Part Number
20178-3
Description
Gear,antibacklash,spur
CAGE
14632

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.

Part 20178-3 NSN 3020-00-455-1225

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
26668
FIIG:
A27300
Concept No.:
App. Key:
AC
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
U
ESD:
ESD:
MMAC:
CRITL:
X

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Schedule B and Export
  • Schedule B: 8483409000
  • SITC: 74840
  • End Use: Industrial machines, other
  • NAICS: 333612
  • USDA: 1

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

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