The Gear,spur, cataloged under National Stock Number 3020-01-446-8120, 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 Naval Sea Systems Command. Government technical data includes 13 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-446-8120 |
| Primary Part Number | 123-4556117 PART 1 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Keyway Nominal Width | 0.562 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 2.250 INCHES BOTH ENDS IN |
| Teeth Quantity | 15 |
| Body Style | PLAIN, SOLID |
| Bore Style | W/ 2 KEYWAYS BOTH ENDS |
| Style Designator | HUBLESS |
| Material Document and Classification | 66AISI/SAE4340 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 5.0000 INCHES NOMINAL IN |
| Nominal Outside Diameter | 5.533 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 1.406 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4340 OVERALL |
| Face Nominal Width | 4.000 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 |
|---|---|
| 123-4556117 PART 1 PRIMARY | Naval Sea Systems Command (USA) |
| 123-4403533 PART 73 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 4403533 | D/9 Drawing number reference only Naval Sea Systems Command |
| H600-1502-77 PART 73 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 4556117 | D/9 Drawing number reference only Naval Sea Systems Command |
| H600-1502-129 PART 1 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 3020-01-446-8120 is a Gear,spur, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-446-8120 has 2 manufacturer part numbers on file: 123-4556117 PART 1 (Naval Sea Systems Command), 123-4403533 PART 73 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 3040-01-446-8171. Verify interchangeability with system specifications before substitution.
Key specifications for 123-4556117 PART 1: Keyway Nominal Width: 0.562 INCHES BOTH ENDS IN; Bore Nominal Diameter: 2.250 INCHES BOTH ENDS IN; Teeth Quantity: 15; Body Style: PLAIN, SOLID. 13 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.