The Gear,spur, cataloged under National Stock Number 3020-01-379-2120, 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 14 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 10 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-379-2120 |
| Primary Part Number | 561-6404325-145 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.250 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.500 INCHES FIRST END IN |
| Teeth Quantity | 240 |
| Body Style | PLAIN, SOLID |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.250 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 10 |
| Style Designator | PROTRUDING HUB |
| Pitch Diameter | 3.7500 INCHES NOMINAL IN |
| Hub Style Designator | PINNED FIRST END |
| Nominal Outside Diameter | 3.781 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL CORROSION RESISTING OVERALL |
| Face Nominal Width | 0.188 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 |
|---|---|
| 211051961 | Naval Sea Systems Command (USA) |
| H31-240 | Designatronics Incorporated Div Sterling Instruments Div (USA) |
| 561-6404325-145 PRIMARY | Naval Sea Systems Command (USA) |
| G17-240 PRIMARY | Roller Bearing Co of America, Inc Div Pic Design (USA) |
| GP36-240 PRIMARY | Secs Inc (USA) |
| Reference | Meaning |
|---|---|
| LAS-F7-240 | 5/9 Secondary reference Nordex Inc |
| DG17T240 | 5/9 Secondary reference Allied Devices Corp Dba Absolute Precision Co |
| PG-7062-240 | 5/9 Secondary reference U.S. Government activity |
| LAS-F7-240 | C/1 Advisory reference — outside the item-of-supply concept Nordex, Incorporated Dba Nordex Inc |
| P64S28-240 | 5/9 Secondary reference W. M. Berg, Inc. |
| 6404325 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3020-01-379-2120 is a Gear,spur, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-379-2120 has 5 manufacturer part numbers on file: 211051961 (Naval Sea Systems Command), H31-240 (Designatronics Incorporated Div Sterling Instruments Div), 561-6404325-145 (Naval Sea Systems Command), G17-240 (Roller Bearing Co of America, Inc Div Pic Design), GP36-240 (Secs Inc).
10 possible matches (shared part number, not a government interchangeability claim): 3020-01-379-3064, 3020-01-409-1251, 3020-01-409-1258. Verify interchangeability with system specifications before substitution.
Key specifications for 561-6404325-145: Bore Nominal Diameter: 0.250 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.500 INCHES FIRST END IN; Teeth Quantity: 240; Body Style: PLAIN, SOLID. 14 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.