The Gear,spur, cataloged under National Stock Number 3020-01-133-0478, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 23 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-133-0478 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.499 INCHES BOTH ENDS0.499 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.313 INCHES FIRST END0.313 INCHES FIRST END IN |
| Teeth Quantity | 4242 |
| Surface Treatment Document and Classification | MIL-F-14072,FINISH E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALLMIL-F-14072,FINISH E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | PLAIN, SOLIDPLAIN, SOLID |
| Bore Style | PLAIN BOTH ENDSPLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 2 THREADED AXIALLY THROUGH HUB FIRST END2 THREADED AXIALLY THROUGH HUB FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.156 INCHES FIRST END0.156 INCHES FIRST END IN |
| Nominal Overall Length | 0.2500 INCHES0.2500 INCHES IN |
| Style Designator | HUBLESSHUBLESS |
| Material Document and Classification | QQ-S-764,TYPE 303,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALLQQ-S-764,TYPE 303,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 0.8750 INCHES NOMINAL0.8750 INCHES NOMINAL IN |
| Tooth Form | STANDARDSTANDARD |
| Hub Style Designator | PINNED FIRST ENDPINNED FIRST END |
| Mounting Hole Nominal Thread Size | 0.086 INCHES AXIALLY THROUGH HUB FIRST END0.086 INCHES AXIALLY THROUGH HUB FIRST END IN |
| Nominal Outside Diameter | 0.914 INCHES0.914 INCHES IN |
| Mounting Hole Thread Quantity Per Inch | 56 AXIALLY THROUGH HUB FIRST END56 AXIALLY THROUGH HUB FIRST END |
| Surface Treatment | PASSIVATE OVERALLPASSIVATE OVERALL |
| Pressure Angle | 20.0000 DEGREES20.0000 DEGREES |
| Material | STEEL COMP 303 OVERALL |
| Mounting Hole Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) AXIALLY THROUGH HUB FIRST ENDUNIFIED NATIONAL COARSE (UNC) AXIALLY THROUGH HUB FIRST END |
| Attachment Method | MOUNTING HOLEMOUNTING HOLE |
| Face Nominal Width | 0.094 INCHES0.094 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| SM-C-791018 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-01-133-0478 is a Gear,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-01-133-0478: Bore Nominal Diameter: 0.499 INCHES BOTH ENDS0.499 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.313 INCHES FIRST END0.313 INCHES FIRST END IN; Teeth Quantity: 4242; Surface Treatment Document and Classification: MIL-F-14072,FINISH E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALLMIL-F-14072,FINISH E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 23 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.