3020-00-179-3937 GEAR,ANTIBACKLASH,SPUR Index 3020-00-179-3941 GEAR,ANTIBACKLASH,SPUR

National Stock Number:
3020-00-179-3938

Federal Supply Class:
3020

National Item Identification Number:
001793938

Description:
GEAR,ANTIBACKLASH,SPUR

Detail:
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.


Manufacturer Information:
242-639-000395542NORTHROP GRUMMAN SYSTEMS CORPORATION
242-639-00301351SOUTHERN GEAR & MACHINE INC


Techincal Specification:
BORE STYLEPLAIN BOTH ENDS
BORE NOMINAL DIAMETER0.125 INCHES BOTH ENDS
FURNISHED ITEMS AND QUANTITY1 SETSCREW
FACE NOMINAL WIDTH0.125 INCHES
HUB NOMINAL DIAMETER0.375 INCHES FIRST END
HUB STYLE DESIGNATORPINNED FIRST END
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/4 T3 OR T4 FED SPEC 1ST MATERIAL RESPONSE FIRST GEAR
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/4 T3 OR T4 FED SPEC 3RD MATERIAL RESPONSE SECOND GEAR
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC 2ND MATERIAL RESPONSE HUB
MATERIALALUMINUM ALLOY FIRST GEAR
MATERIALALUMINUM ALLOY SECOND GEAR
MATERIALSTEEL COMP 303 HUB
MATERIALSTEEL CORROSION RESISTING RETAINING RING
MATERIALSTEEL SPRING
NOMINAL DISTANCE BETWEEN BODY FACE AND PROTRUDING HUB END0.188 INCHES FIRST END
NOMINAL OUTSIDE DIAMETER1.021 INCHES
PITCH DIAMETER1.0000 INCHES NOMINAL
PRECISION CLASSIFICATIONQUALITY NUMBER 10
PRESSURE ANGLE20.0000 DEGREES
STYLE DESIGNATORPROTRUDING HUB
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC 1ST TREATMENT RESPONSE FIRST GEAR
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC 3RD TREATMENT RESPONSE SECOND GEAR
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-F-14072,FINISH E300 MIL SPEC 2ND TREATMENT RESPONSE HUB
SURFACE TREATMENTANODIZE FIRST GEAR
SURFACE TREATMENTANODIZE SECOND GEAR
SURFACE TREATMENTPASSIVATE HUB
SURFACE TREATMENTPASSIVATE RETAINING RING
TEETH QUANTITY96
TOOTH FORMSTANDARD


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