Model: SM-B-178919

Spur Antibacklash Gear

Properties:

Attachment Method
Clamp
Pitch Diameter
1.6250 inches
Teeth Quantity
52
Bore Style
Plain both ends
Backlash Designation
Grade b
Outside Diameter
1.688 inches
Tooth Form
Standard
Pressure Angle
20.0000 degrees
Distance Between Body Face And Protruding Hub End
0.278 inches first end
Distance Between Body Face And Protruding Hub End
0.031 inches second end
Face Width
0.110 inches
Bore Diameter
0.250 inches both ends
Hub Style Designator
Plain second end
Hub Style Designator
Split first end
Hub Diameter
0.312 inches first end
Hub Diameter
0.563 inches second end
Clamping Surface Length
0.250 inches first end
Material
Steel comp 301 second gear
Material
Steel comp 301 first gear
Material
Steel comp 303 hub
Material
Steel spring
Material Specification
Mil-s-5059 military specification single material response first gear
Material Specification
Mil-s-5059 military specification single material response second gear
Material Specification
Qq-s-764 federal specification single material response hub
Surface Treatment
Passivate first gear
Surface Treatment
Passivate hub
Surface Treatment
Passivate second gear
Style Designator
Protruding hubs
NSN
3020-00-942-4959
Part Number
SM-B-178919
Description
Gear,antibacklash,spur
CAGE
80063

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 SM-B-178919 NSN 3020-00-942-4959

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

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
197339
UFC:
96710
LTL:
65.0
LCL:
--
WCC:
593
TCC:
Z
SHC:
9
ACC:
Trailers/Vehicles

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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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