Model: 242-639-003

Spur Antibacklash Gear

Properties:

Pitch Diameter
1.0000 inches
Teeth Quantity
96
Bore Style
Plain both ends
Outside Diameter
1.021 inches
Tooth Form
Standard
Pressure Angle
20.0000 degrees
Distance Between Body Face And Protruding Hub End
0.188 inches first end
Face Width
0.125 inches
Bore Diameter
0.125 inches both ends
Hub Style Designator
Pinned first end
Hub Diameter
0.375 inches first end
Precision Classification
Quality number 10
Material
Aluminum alloy first gear
Material
Aluminum alloy second gear
Material
Steel comp 303 hub
Material
Stainless steel retaining ring
Material
Steel spring
Material Specification
Qq-a-250/4 t3 or t4 federal specification 3rd material response second gear
Material Specification
Qq-a-250/4 t3 or t4 federal specification 1st material response first gear
Material Specification
Qq-s-763 federal specification 2nd material response hub
Surface Treatment
Anodize first gear
Surface Treatment
Anodize second gear
Surface Treatment
Passivate hub
Surface Treatment
Passivate retaining ring
Surface Treatment Specification
Mil-a-8625 military specification 1st treatment response first gear
Surface Treatment Specification
Mil-a-8625 military specification 3rd treatment response second gear
Surface Treatment Specification
Mil-f-14072, finish e300 military specification 2nd treatment response hub
Style Designator
Protruding hub
Furnished Items And Quantity
1 setscrew
NSN
3020-00-179-3938
Part Number
242-639-003
Description
Gear,antibacklash,spur
CAGE
01351

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 242-639-003 NSN 3020-00-179-3938

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:
133300
UFC:
63220
LTL:
RATING VARIABLE
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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