NSN 3020-00-020-3954 3157346, 3157-346, 00-020-3954
Product Details | SPUR ANTIBACKLASH GEAR
3020-00-020-3954 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.
Part Alternates: 3157346, 3157-346, 3020-00-020-3954, 00-020-3954, 3020000203954, 000203954
Mechanical Power Transmission Equipment | Gears, Pulleys, Sprockets, and Transmission Chain
| Supply Group (FSG) | NSN Assign. | NIIN | Item Name Code (INC) |
|---|---|---|---|
| 30 | 01 JAN 1963 | 00-020-3954 | 26668 ( GEAR, ANTIBACKLASH, SPUR ) |
Drawings & Photos | NSN 3020-00-020-3954
Cross Reference | NSN 3020-00-020-3954
| Part Number | Cage Code | Manufacturer |
|---|---|---|
| 3157-346 | 90073 | CMC ELECTRONICS INC |
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Technical Data | NSN 3020-00-020-3954
| Characteristic | Specifications |
|---|---|
| FIRST STEP NOMINAL DIAMETER | 0.625 INCHES FIRST END |
| HUB STYLE DESIGNATOR | PLAIN SECOND END |
| BORE NOMINAL DIAMETER | 0.090 INCHES BOTH ENDS |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-766,COND A FED SPEC SINGLE MATERIAL RESPONSE BODY |
| HUB STYLE DESIGNATOR | 1 STEP FIRST END |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-766,COND A FED SPEC SINGLE MATERIAL RESPONSE HUB |
| TOOTH FORM | STANDARD |
| MOUNTING HOLE NOMINAL THREAD SIZE | 0.086 INCHES AXIALLY THROUGH HUB, FIRST END |
| BACKLASH DESIGNATION | GRADE A |
| MOUNTING HOLE NOMINAL THREAD SIZE | 0.086 INCHES AXIALLY THROUGH HUB, SECOND END |
| FACE NOMINAL WIDTH | 0.062 INCHES |
| MOUNTING HOLE THREAD SERIES DESIGNATOR | UNC AXIALLY THROUGH HUB, FIRST END |
| MATERIAL | STEEL COMP 303 HUB |
| PRESSURE ANGLE | 20.0000 DEGREES |
| END NOMINAL DIAMETER | 0.245 INCHES FIRST END |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| MOUNTING HOLE THREAD SERIES DESIGNATOR | UNC AXIALLY THROUGH HUB, SECOND END |
| END NOMINAL LENGTH | 0.138 INCHES FIRST END |
| MATERIAL | STEEL COMP 302 BODY |
| FIRST STEP NOMINAL LENGTH | 0.031 INCHES FIRST END |
| ATTACHMENT METHOD | MOUNTING HOLE |
| PRECISION CLASSIFICATION | QUALITY NUMBER 10 OR QUALITY NUMBER 11 |
| PITCH DIAMETER | 1.2500 INCHES NOMINAL |
| MOUNTING HOLE TYPE AND QUANTITY | 1 THREADED AXIALLY THROUGH HUB, FIRST END |
| NOMINAL OUTSIDE DIAMETER | 1.276 INCHES |
| TEETH QUANTITY | 80 |
| STYLE DESIGNATOR | PROTRUDING HUBS |
| NOMINAL DISTANCE BETWEEN BODY FACE AND PROTRUDING HUB END | 0.032 INCHES SECOND END |
| BORE STYLE | PLAIN BOTH ENDS |
| MOUNTING HOLE TYPE AND QUANTITY | 1 THREADED AXIALLY THROUGH HUB, SECOND END |
| HUB NOMINAL DIAMETER | 0.257 INCHES SECOND END |
| NOMINAL DISTANCE BETWEEN BODY FACE AND PROTRUDING HUB END | 0.169 INCHES FIRST END |
Restrictions/Controls & Freight Information | NSN 3020-00-020-3954
| Category | Code | Description |
|---|---|---|
| Hazardous Material Indicator Code | N | There is no data in the HMIS and the NSN is in an FSC not generally suspected of containing hazardous materials |
| Demilitarization Code: | A | Non-Munitions List Item/ Non-Strategic List Item - Demilitarization not required. |
| Precious Metals Indicator Code: | U | Precious metal type is unknown |
| Criticality Code: | X | The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. |
| Category | Code | Description |
|---|---|---|
| NMF Description | 197339 | WHEELS COG/GEAR/PINION I/S |
| Less than car load rating | ||
| Less than truck load rating | R | 65.0 |
| Water commodity Code | 593 | unknown |
| Originating Activity Code | XX | |
| Air Dimension Code | A | Shipment is not a consolidation and does not exceed 72 inches in any dimension. |
| Air Commodity | B | Construction materials: Includes paint and related materials, prefabricated building, wood products, metal and composition materials and their products, commercial hardware and miscellaneous items, cement, asphalt, building maintenance materials. |
| Air Special Handling | Z | No special handling required. |
| Special Handling Code | 9 | unknonwn |
| HAZMAT | ||
| Type of Cargo | Z | No special type of cargo code applicable |