The Gear,helical, cataloged under National Stock Number 3020-00-528-7118, 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 Motors Llc Dba General Motors Llc. Government technical data includes 27 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-528-7118 |
| Primary Part Number | 3260891 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | General Motors Llc Dba General Motors Llc |
| Status | ACTIVE |
| Bore Nominal Diameter | 4.3750 INCHES COUNTERBORE FIRST END IN |
| Helix Angle | 25.8167 DEGREES |
| Hub Nominal Diameter | 6.750 INCHES FIRST END IN |
| Teeth Quantity | 69 |
| Body Style | WEBBED, OFFSET, SOLID |
| Counterbore Nominal Diameter | 6.2515 INCHES COUNTERBORE FIRST END IN |
| Tooth Direction | RIGHT |
| Bore Style | W/COUNTERBORE COUNTERBORE FIRST END |
| Mounting Hole Type and Quantity | 4 THREADED AXIALLY THROUGH BODY FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.3120 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Style Designator | PROTRUDING HUB, RECESSED BODY |
| Material Document and Classification | MS 288-72915 MIL STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 8.6250 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Mounting Hole Nominal Thread Size | 0.3750 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Nominal Outside Diameter | 8.874 INCHES IN |
| Mounting Hole Thread Quantity Per Inch | 24 AXIALLY THROUGH BODY FIRST END |
| Pressure Angle | 14.5000 DEGREES |
| Material | COPPER ALLOY OVERALL |
| Bolt Hole Circle Nominal Diameter | 5.250 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Counterbore Nominal Depth | 0.3120 INCHES COUNTERBORE FIRST END IN |
| Mounting Hole Thread Series Designator | UNF AXIALLY THROUGH BODY FIRST END |
| Attachment Method | MOUNTING HOLE |
| Body Recess Nominal Depth | 1.3120 INCHES SECOND END IN |
| Face Nominal Width | 1.750 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 |
|---|---|
| 3260891 PRIMARY | General Motors Llc Dba General Motors Llc (USA) |
| 3260891 | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3260891 | C/1 Advisory reference — outside the item-of-supply concept General Motors Corp Electro-Motive Div |
| 3260891 | 3/9 Design control — primary reference General Motors Corp |
NSN 3020-00-528-7118 is a Gear,helical, manufactured by General Motors Llc Dba General Motors Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-528-7118 has 2 manufacturer part numbers on file: 3260891 (General Motors Llc Dba General Motors Llc), 3260891 (Hatch & Kirk, Inc.).
Key specifications for 3260891: Bore Nominal Diameter: 4.3750 INCHES COUNTERBORE FIRST END IN; Helix Angle: 25.8167 DEGREES; Hub Nominal Diameter: 6.750 INCHES FIRST END IN; Teeth Quantity: 69. 27 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.