The Gear,spur, cataloged under National Stock Number 3020-00-902-1953, 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 27 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-902-1953 |
| Primary Part Number | 6777652 |
| 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 | 1.245 INCHES BOTH ENDS IN |
| Teeth Quantity | 37 |
| Second Step Nominal Diameter | 2.158 INCHES FIRST END IN |
| Body Style | WEBBED, SOLID |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 2.250 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 1.311 INCHES SECOND END IN |
| First Step Nominal Length | 0.725 INCHES FIRST END IN |
| First Step Nominal Length | 0.486 INCHES SECOND END IN |
| Second Step Nominal Length | 0.875 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUBS |
| Pitch Diameter | 4.2110 INCHES NOMINAL IN |
| Tooth Form | SPECIAL |
| First Step Nominal Diameter | 1.772 INCHES FIRST END IN |
| First Step Nominal Diameter | 2.118 INCHES SECOND END IN |
| Hub Style Designator | 2 STEPS FIRST END |
| Hub Style Designator | 1 STEP SECOND END |
| Spline Quantity | 14 BOTH ENDS |
| End Nominal Length | 0.670 INCHES FIRST END IN |
| End Nominal Length | 0.825 INCHES SECOND END IN |
| Nominal Outside Diameter | 4.492 INCHES IN |
| End Nominal Diameter | 1.633 INCHES FIRST END IN |
| End Nominal Diameter | 1.770 INCHES SECOND END IN |
| Pressure Angle | 25.0000 DEGREES |
| Material | STEEL OVERALL |
| Spline Pitch Diameter | 1.1600 INCHES NOMINAL BOTH ENDS IN |
| Face Nominal Width | 0.905 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 |
|---|---|
| 6777652 PRIMARY | Allison Transmission Inc Dba Allison Transmission, Inc (USA) |
| Reference | Meaning |
|---|---|
| 6777652 | 5/9 Secondary reference General Motors Corp |
NSN 3020-00-902-1953 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 3020-00-902-1953 has 1 manufacturer part number on file: 6777652 (Allison Transmission Inc Dba Allison Transmission, Inc).
Key specifications for 6777652: Bore Nominal Diameter: 1.245 INCHES BOTH ENDS IN; Teeth Quantity: 37; Second Step Nominal Diameter: 2.158 INCHES FIRST END IN; Body Style: WEBBED, SOLID. 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.