Model: 251658R1

Helical Gear

Special Features:

Timing mark on 25 tooth cw from center of keyway, both chamfers 1/16 in. By 45 degrees opposite timing mark, timing mark between 4 and 5 tooth, ccw from center of keyway

Properties:

Body Style
Webbed, offset, solid
Pitch Diameter
2.0234 inches
Teeth Quantity
54
Bore Style
10a w/ keyway both ends
Bore Style
W/ keyway both ends
Hardness Rating
16.0 rockwell c and 26.0 rockwell c
Outside Diameter
7.220 inches
Nominallength
1.375 inches
Teeth Type
Single helix
Tooth Form
Standard
Tooth Direction
Left
Pressure Angle
14.5000 degrees
Helix Angle
39.4500 degrees
Distance Between Body Face And Protruding Hub End
0.109 inches both ends
Distance Between Body Face And Recessed Hub End
0.171 inches second end
Face Width
1.125 inches
Bore Diameter
1.249 inches both ends
Keyway Width
0.252 inches both ends
Distance From Bore Center To Keyway Bottom
0.745 inches both ends
Hub Style Designator
Plain both ends
Hub Diameter
1.875 inches second end
Hub Diameter
2.375 inches first end
Material
Iron
Style Designator
One protruding hub, one recessed hub
NSN
3020-00-204-0154
Part Number
251658R1
Description
Gear,helical
CAGE
29510

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 251658R1 NSN 3020-00-204-0154

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

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
197339
UFC:
96710
LTL:
65.0
LCL:
60.0
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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