The Gear,antibacklash,spur, cataloged under National Stock Number 3020-00-678-1632, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. The manufacturer of record is General Dynamics Mission Systems, Inc.. Government technical data includes 24 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-678-1632 |
| Primary Part Number | 75-737428-1 |
| Item Name | Gear,antibacklash,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | General Dynamics Mission Systems, Inc. |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.250 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.438 INCHES SECOND END IN |
| Hub Nominal Diameter | 1.1880 INCHES FIRST END IN |
| Teeth Quantity | 128 |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.0625 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.281 INCHES FIRST END IN |
| First Step Nominal Length | 0.0625 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUBS |
| Pitch Diameter | 1.7778 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 1.1875 INCHES FIRST END IN |
| Hub Style Designator | PLAIN SECOND END |
| Hub Style Designator | PINNED FIRST END |
| End Nominal Length | 0.2187 INCHES FIRST END IN |
| Nominal Outside Diameter | 1.8056 INCHES IN |
| Surface Treatment | PASSIVATE HUB |
| End Nominal Diameter | 0.4375 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL CORROSION RESISTING SPRING |
| Material | COPPER ALLOY SECOND GEAR |
| Material | STEEL CORROSION RESISTING HUB |
| Material | COPPER ALLOY FIRST GEAR |
| Face Nominal Width | 0.125 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 |
| Part Number | Manufacturer |
|---|---|
| 75-737428-1 | General Dynamics Mission Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 75-737428-1 | 3/9 Design control — primary reference General Dynamics Advanced Information Systems Inc. Dba General Dynamics Advanced Information Systems |
NSN 3020-00-678-1632 is a Gear,antibacklash,spur, manufactured by General Dynamics Mission Systems, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-678-1632 has 1 manufacturer part number on file: 75-737428-1 (General Dynamics Mission Systems, Inc.).
Key specifications for 75-737428-1: Bore Nominal Diameter: 0.250 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.438 INCHES SECOND END IN; Hub Nominal Diameter: 1.1880 INCHES FIRST END IN; Teeth Quantity: 128. 24 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.