The Gear Sector,worm Wheel, cataloged under National Stock Number 3020-01-424-7399, 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 21 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-424-7399 |
| Primary Part Number | 845-2068554 ITEM 4 |
| Item Name | Gear Sector,worm Wheel |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.125 INCHES BOTH ENDS IN |
| Helix Angle | 10.5664 DEGREES |
| Hub Nominal Diameter | 1.625 INCHES FIRST END IN |
| Teeth Quantity | 40 |
| Nominal Outside Radius | 3.2840 INCHES IN |
| Tooth Direction | RIGHT |
| Bore Style | STRAIGHT SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.3125 INCHES FIRST END IN |
| Throat Nominal Radius | 0.661 INCHES IN |
| Face Type | CONCAVE |
| Mating Pitch Diameter | 6.1120 INCHES NOMINAL IN |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | MIL-M-16576 MIL STD SINGLE MATERIAL RESPONSE OVERALL |
| Hub Style Designator | PLAIN FIRST END |
| Spline Quantity | 9 BOTH ENDS |
| Arc Nominal Length | 6.6590 INCHES IN |
| Pitch Radius | 3.0560 INCHES NOMINAL IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | COPPER ALLOY OVERALL |
| Mating Thread Lead Quantity | 1 |
| Face Nominal Width | 1.4375 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 |
|---|---|
| 845-2068554 ITEM 4 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 845-2068554 ITEM 4 | 3/2 Design control — primary reference U.S. Government activity |
| 2068554 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3020-01-424-7399 is a Gear Sector,worm Wheel, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-424-7399 has 1 manufacturer part number on file: 845-2068554 ITEM 4 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-424-9076, 4820-01-424-9820. Verify interchangeability with system specifications before substitution.
Key specifications for 845-2068554 ITEM 4: Bore Nominal Diameter: 1.125 INCHES BOTH ENDS IN; Helix Angle: 10.5664 DEGREES; Hub Nominal Diameter: 1.625 INCHES FIRST END IN; Teeth Quantity: 40. 21 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.