Model: 4256A424

Worm Wheel Antibacklash Gear

Properties:

Attachment Method
Clamp
Pitch Diameter
1.4526 inches
Teeth Quantity
93
Face Type
Concave
Bore Style
Plain both ends
Outside Diameter
1.484 inches
Tooth Direction
Right
Mating Thread Lead Quantity
2
Pressure Angle
14.5000 degrees
Helix Angle
3.5625 degrees
Distance Between Body Face And Protruding Hub End
0.219 inches first end
Face Width
0.188 inches
Bore Diameter
0.188 inches both ends
Hub Style Designator
Split first end
Hub Diameter
0.250 inches first end
Material
Copper alloy 464 body
Material
Steel comp 303 hub
Material Specification
Qq-b-637 federal specification single material response body
Material Specification
Qq-s-764, cond a federal specification single material response hub
Surface Treatment
Passivate hub
Style Designator
Protruding hub
NSN
3020-01-025-0489
Part Number
4256A424
Description
Gear,antibacklash,worm Wheel
CAGE
23905

An item having one fixed gear and one free gear, both having the same complement of worm wheel 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 4256A424 NSN 3020-01-025-0489

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
26669
FIIG:
A27300
Concept No.:
App. Key:
AD
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:
0.1000lbs
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:
197337
UFC:
96690
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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