Model: 3157-346

Spur Antibacklash Gear

Properties:

Attachment Method
Mounting hole
Pitch Diameter
1.2500 inches
Teeth Quantity
80
Bore Style
Plain both ends
Backlash Designation
Grade a
Mounting Hole Thread Series Designator
Unc axially through hub, first end
Mounting Hole Thread Series Designator
Unc axially through hub, second end
Mounting Hole Thread Size
0.086 inches axially through hub, first end
Mounting Hole Thread Size
0.086 inches axially through hub, second end
Mounting Hole Type And Quantity
1 threaded axially through hub, first end
Mounting Hole Type And Quantity
1 threaded axially through hub, second end
Outside Diameter
1.276 inches
Tooth Form
Standard
Pressure Angle
20.0000 degrees
Distance Between Body Face And Protruding Hub End
0.169 inches first end
Distance Between Body Face And Protruding Hub End
0.032 inches second end
Face Width
0.062 inches
Bore Diameter
0.090 inches both ends
Hub Style Designator
1 step first end
Hub Style Designator
Plain second end
Hub Diameter
0.257 inches second end
End Length
0.138 inches first end
Precision Classification
Quality number 10 or quality number 11
End Diameter
0.245 inches first end
First Step Length
0.031 inches first end
First Step Diameter
0.625 inches first end
Material
Steel comp 302 body
Material
Steel comp 303 hub
Material Specification
Qq-s-766, cond a federal specification single material response body
Material Specification
Qq-s-766, cond a federal specification single material response hub
Surface Treatment
Passivate
Style Designator
Protruding hubs
NSN
3020-00-020-3954
Part Number
3157-346
Description
Gear,antibacklash,spur
CAGE
90073

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 3157-346 NSN 3020-00-020-3954

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

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
--
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
Q
LVL_B:
Q

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:
Construction Materials

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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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