Model: 31251F

Helical Gear

Properties:

Body Style
Plain, solid
Attachment Method
Mounting hole
Pitch Diameter
3.5000 inches
Teeth Quantity
27
Bore Style
10a w/ keyway both ends
Bore Style
W/ keyway both ends
Mounting Hole Thread Series Designator
Unc axially through body, first end
Mounting Hole Thready Qty Per Inch (tpi)
16 axially through body, first end
Mounting Hole Thread Size
0.375 inches axially through body, first end
Mounting Hole Type And Quantity
2 threaded axially through body, first end
Outside Diameter
3.698 inches
Teeth Type
Single helix
Tooth Form
Standard
Tooth Direction
Left
Pressure Angle
14.5000 degrees
Helix Angle
39.5167 degrees
Face Width
1.498 inches
Bore Diameter
1.929 inches both ends
Keyway Width
0.251 inches both ends
Distance From Bore Center To Keyway Bottom
1.094 inches both ends
Bolt Hole Circle Diameter
2.625 inches axially through body, first end
Material
Steel
Material Specification
Qq-s-633 fs 1035 federal specification single material response
Style Designator
Hubless
NSN
3020-00-517-1120
Part Number
31251F
Description
Gear,helical
CAGE
56442

A gear, cylindrical in form, with teeth on the outer surface at an angle to the axis of the gear. See also gear, antibacklash, helical:

Part 31251F NSN 3020-00-517-1120

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
05464
FIIG:
A27300
Concept No.:
1
App. Key:
AF
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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