The Gear,spur, cataloged under National Stock Number 3020-01-084-0557, 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-084-0557 |
| Primary Part Number | 845-4687756 PIECE 8 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.000 INCHES BOTH ENDS IN |
| Teeth Quantity | 80 |
| Body Style | WEBBED, OFFSET, SOLID |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 1 PLAIN AXIALLY THROUGH BODY FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.343 INCHES FIRST END IN |
| First Step Nominal Length | 0.177 INCHES FIRST END IN |
| Mounting Hole Nominal Diameter | 0.125 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Style Designator | PROTRUDING HUB, RECESSED BODY |
| Pitch Diameter | 3.6341 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 2.940 INCHES FIRST END IN |
| Hub Style Designator | 1 STEP FIRST END |
| End Nominal Length | 0.166 INCHES FIRST END IN |
| Nominal Outside Diameter | 3.725 INCHES IN |
| End Nominal Diameter | 1.755 INCHES FIRST END IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL OVERALL |
| Attachment Method | MOUNTING HOLE |
| Body Recess Nominal Depth | 0.214 INCHES SECOND END IN |
| Face Nominal Width | 0.192 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 |
|---|---|
| 845-4687756 PIECE 8 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 2642-982-03 PC 5 | 3/2 Design control — primary reference U.S. Government activity |
| 4775959-0005 | 3/2 Design control — primary reference U.S. Government activity |
| 845-4775959 | D/9 Drawing number reference only U.S. Government activity |
| 845-4687756 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3020-01-084-0557 is a Gear,spur, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-084-0557 has 1 manufacturer part number on file: 845-4687756 PIECE 8 (Naval Sea Systems Command).
7 possible matches (shared part number, not a government interchangeability claim): 3040-01-085-8917, 3020-01-092-0409, 3020-01-092-1131. Verify interchangeability with system specifications before substitution.
Key specifications for 845-4687756 PIECE 8: Bore Nominal Diameter: 1.000 INCHES BOTH ENDS IN; Teeth Quantity: 80; Body Style: WEBBED, OFFSET, SOLID; Bore Style: PLAIN BOTH ENDS. 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.