The Gear,internal, cataloged under National Stock Number 3020-01-421-5277, 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 24 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-421-5277 |
| Primary Part Number | 801-6406709 FIND 81 |
| Item Name | Gear,internal |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.000 INCHES FIRST END IN |
| Hub Nominal Diameter | 5.320 INCHES SECOND END IN |
| Teeth Quantity | 42 |
| Second Step Nominal Diameter | 5.320 INCHES FIRST END IN |
| Body Style | PLAIN, SOLID |
| Bore Style | INVOLUTE SPLINE FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.156 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 2.909 INCHES FIRST END IN |
| First Step Nominal Length | 0.219 INCHES FIRST END IN |
| Teeth Type | SPUR |
| Second Step Nominal Length | 0.845 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUBS |
| Pitch Diameter | 4.2000 INCHES NOMINAL IN |
| First Step Nominal Diameter | 4.498 INCHES FIRST END IN |
| Hub Style Designator | 2 STEPS FIRST END |
| Hub Style Designator | PLAIN SECOND END |
| Spline Quantity | 9 FIRST END |
| End Nominal Length | 0.846 INCHES FIRST END IN |
| Nominal Outside Diameter | 5.342 INCHES IN |
| End Nominal Diameter | 3.500 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Spline Pitch Diameter | 1.7190 INCHES NOMINAL FIRST END IN |
| Face Nominal Width | 0.875 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 |
|---|---|
| 801-6406709 FIND 81 PRIMARY | Naval Sea Systems Command (USA) |
| 211085738 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6406709 | D/9 Drawing number reference only Naval Sea Systems Command |
| DF331106 FIND 81 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 3020-01-421-5277 is a Gear,internal, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-421-5277 has 2 manufacturer part numbers on file: 801-6406709 FIND 81 (Naval Sea Systems Command), 211085738 (Naval Sea Systems Command).
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-422-2300, 4820-01-434-7956, 3040-01-438-1471. Verify interchangeability with system specifications before substitution.
Key specifications for 801-6406709 FIND 81: Bore Nominal Diameter: 2.000 INCHES FIRST END IN; Hub Nominal Diameter: 5.320 INCHES SECOND END IN; Teeth Quantity: 42; Second Step Nominal Diameter: 5.320 INCHES FIRST END IN. 24 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.