The Gear,spur, cataloged under National Stock Number 3020-01-122-5906, 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 Allison Transmission Inc Dba Allison Transmission, Inc. Government technical data includes 25 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-01-122-5906 |
| Primary Part Number | 6881580 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Allison Transmission Inc Dba Allison Transmission, Inc |
| Status | ACTIVE |
| Bore Nominal Diameter | 3.000 INCHES BOTH ENDS IN |
| Teeth Quantity | 76 |
| Second Step Nominal Diameter | 7.500 INCHES FIRST END IN |
| Body Style | WEBBED, OFFSET, SOLID |
| Counterbore Nominal Diameter | 3.400 INCHES SECOND END IN |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Bore Style | W/COUNTERBORE SECOND END |
| Nominal Distance Between Body Face and Protruding Hub End | 2.250 INCHES FIRST END IN |
| First Step Nominal Length | 0.141 INCHES FIRST END IN |
| Second Step Nominal Length | 0.250 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUB, RECESSED BODY |
| Pitch Diameter | 7.6000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 4.437 INCHES FIRST END IN |
| Hub Style Designator | 2 STEPS FIRST END |
| Spline Quantity | 58 BOTH ENDS |
| End Nominal Length | 1.859 INCHES FIRST END IN |
| Nominal Outside Diameter | 7.800 INCHES IN |
| End Nominal Diameter | 3.609 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Counterbore Nominal Depth | 0.132 INCHES SECOND END IN |
| Spline Pitch Diameter | 2.9000 INCHES NOMINAL BOTH ENDS IN |
| Body Recess Nominal Depth | 0.531 INCHES SECOND END IN |
| Face Nominal Width | 0.500 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 |
|---|---|
| 6881580 PRIMARY | Allison Transmission Inc Dba Allison Transmission, Inc (USA) |
| Reference | Meaning |
|---|---|
| 6881580 | 5/9 Secondary reference Detroit Diesel (overseas Distribution Corp) |
NSN 3020-01-122-5906 is a Gear,spur, manufactured by Allison Transmission Inc Dba Allison Transmission, Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-122-5906 has 1 manufacturer part number on file: 6881580 (Allison Transmission Inc Dba Allison Transmission, Inc).
Key specifications for 6881580: Bore Nominal Diameter: 3.000 INCHES BOTH ENDS IN; Teeth Quantity: 76; Second Step Nominal Diameter: 7.500 INCHES FIRST END IN; Body Style: WEBBED, OFFSET, SOLID. 25 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.