The Gear,spur, cataloged under National Stock Number 3020-01-178-8551, 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 Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp. Government technical data includes 15 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-01-178-8551 |
| Primary Part Number | 8478A69H01 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp |
| Status | ACTIVE |
| Bore Nominal Diameter | 3.750 INCHES BOTH ENDS IN |
| Teeth Quantity | 128 |
| Body Style | PLAIN, SOLID |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 4 PLAIN TRANSVERSELY THROUGH FACE |
| Mounting Hole Nominal Diameter | 0.156 INCHES TRANSVERSELY THROUGH FACE IN |
| Style Designator | HUBLESS |
| Material Document and Classification | QQ-S-763,CLASS 316 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 5.3333 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 5.4166 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 316 OVERALL |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 0.190 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 |
|---|---|
| 8478A69H01 PRIMARY | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp (USA) |
| Reference | Meaning |
|---|---|
| 8478A69 | D/9 Drawing number reference only Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp |
NSN 3020-01-178-8551 is a Gear,spur, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-178-8551 has 1 manufacturer part number on file: 8478A69H01 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp).
Key specifications for 8478A69H01: Bore Nominal Diameter: 3.750 INCHES BOTH ENDS IN; Teeth Quantity: 128; Body Style: PLAIN, SOLID; Bore Style: PLAIN BOTH ENDS. 15 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.