The Gear,spur, cataloged under National Stock Number 3020-01-414-4392, 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 18 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-414-4392 |
| Primary Part Number | 845-6556485 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Bore Nominal Diameter | 3.674 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 4.140 INCHES SECOND END IN |
| Teeth Quantity | 37 |
| Body Style | PLAIN, SOLID |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.140 INCHES SECOND END IN |
| Precision Classification | ACCURACY GRADE 10 |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | ASTM A322 ASSN STD 1ST MATERIAL RESPONSE AND AMS 2301 FED SPEC 2ND MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 4.6250 INCHES NOMINAL IN |
| Hub Style Designator | PLAIN SECOND END |
| Spline Quantity | 38 BOTH ENDS |
| Nominal Outside Diameter | 4.916 INCHES IN |
| Surface Treatment | CARBON OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4320H OVERALL |
| Spline Pitch Diameter | 3.8000 INCHES NOMINAL BOTH ENDS IN |
| Face Nominal Width | 1.590 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 |
|---|---|
| 845-6556485 PRIMARY | Naval Sea Systems Command (USA) |
| 845-6603141-36 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6556485 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3020-01-414-4392 is a Gear,spur, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-414-4392 has 2 manufacturer part numbers on file: 845-6556485 (Naval Sea Systems Command), 845-6603141-36 (Naval Sea Systems Command).
Key specifications for 845-6556485: Bore Nominal Diameter: 3.674 INCHES BOTH ENDS IN; Hub Nominal Diameter: 4.140 INCHES SECOND END IN; Teeth Quantity: 37; Body Style: PLAIN, SOLID. 18 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.