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National Stock Number:
3020-00-455-1225
Federal Supply Class:
3020
National Item Identification Number:
004551225
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.
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Manufacturer Information:
| 20178-3 | 14632 | DRS SIGNAL SOLUTIONS, INC. |
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Techincal Specification:
| MATERIAL | ALUMINUM ALLOY 2024 BODY | | STEEL COMP 302 OR | | STEEL COMP 303 OR | | STEEL COMP 303SE OR | | STEEL COMP 316 HUB | | MATERIAL DOCUMENT AND CLASSIFICATION | QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE BODY | | MIL-S-7720 MIL SPEC ALL MATERIAL RESPONSES HUB | | SURFACE TREATMENT | ANODIZE BODY | | PASSIVATE HUB | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE BODY | | MIL-F-14072,FINISH E300 MIL SPEC SINGLE TREATMENT RESPONSE HUB | | TEETH QUANTITY | 60 | | TOOTH FORM | STANDARD | | PRESSURE ANGLE | 20.0000 DEGREES | | PRECISION CLASSIFICATION | QUALITY NUMBER 10 OR | | QUALITY NUMBER 11 | | STYLE DESIGNATOR | PROTRUDING HUB | | PITCH DIAMETER | 0.9375 INCHES NOMINAL | | NOMINAL OVERALL LENGTH | 0.375 INCHES | | NOMINAL OUTSIDE DIAMETER | 0.9688 INCHES | | FACE NOMINAL WIDTH | 0.125 INCHES | | NOMINAL DISTANCE BETWEEN BODY FACE AND PROTRUDING HUB END | 0.250 INCHES FIRST END | | BORE STYLE | PLAIN BOTH ENDS | | BORE NOMINAL DIAMETER | 0.250 INCHES BOTH ENDS | | HUB STYLE DESIGNATOR | PINNED FIRST END | | HUB NOMINAL DIAMETER | 0.375 INCHES FIRST END | | ATTACHMENT METHOD | MOUNTING HOLE | | SPECIAL FEATURES | TWO THREADED MTG HOLES LOCATED HUB BETWEEN HUB END AND GEAR FACE 90 DEG APART; UNC THREAD SERIES; MTG HOLE NOM THD SIZE 0.112 IN.; 40 THDS PER IN. |
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