The Gear,internal, cataloged under National Stock Number 3020-01-416-1649, 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 23 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-416-1649 |
| Primary Part Number | 6397426-0A-105 |
| Item Name | Gear,internal |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Bore Nominal Diameter | 4.661 INCHES FIRST END IN |
| Teeth Quantity | 48 |
| Body Style | PLAIN, SOLID |
| Flange Nominal Thickness | 0.390 INCHES IN |
| Flange Nominal Diameter | 7.500 INCHES IN |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 12 PLAIN AXIALLY THROUGH FLANGE |
| Mounting Hole Nominal Diameter | 0.410 INCHES AXIALLY THROUGH FLANGE IN |
| Teeth Type | SPUR |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 1.060 INCHES IN |
| Style Designator | RECESSED RING FLANGE TYPE HUG |
| Material Document and Classification | MIL-S-5000 MIL STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 4.8000 INCHES NOMINAL IN |
| Tooth Form | STUB |
| Features Provided | ALIGNMENT HOLE |
| Nominal Outside Diameter | 5.999 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Bolt Hole Circle Nominal Diameter | 6.750 INCHES AXIALLY THROUGH FLANGE IN |
| Body Recess Nominal Diameter | 5.120 INCHES FIRST END IN |
| Attachment Method | MOUNTING HOLE |
| Body Recess Nominal Depth | 0.380 INCHES FIRST END 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 |
|---|---|
| 6397426-0A-105 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6397426 | D/9 Drawing number reference only Naval Sea Systems Command |
| 803-6397426-0A- | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
NSN 3020-01-416-1649 is a Gear,internal, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-416-1649 has 1 manufacturer part number on file: 6397426-0A-105 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-450-9590. Verify interchangeability with system specifications before substitution.
Key specifications for 6397426-0A-105: Bore Nominal Diameter: 4.661 INCHES FIRST END IN; Teeth Quantity: 48; Body Style: PLAIN, SOLID; Flange Nominal Thickness: 0.390 INCHES IN. 23 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.