The Gear,spur, cataloged under National Stock Number 3020-01-124-7511, 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 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-124-7511 |
| Primary Part Number | 522-4675675ITEM5 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.995 INCHES BOTH ENDS IN |
| Teeth Quantity | 75 |
| Body Style | WEBBED, WITH LIGHTENING HOLES |
| Bore Style | STRAIGHT SPLINE BOTH ENDS |
| Mounting Hole Type and Quantity | 2 COUNTERBORED TRANSVERSELY THROUGH HUB FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 1.120 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 1.140 INCHES FIRST END IN |
| First Step Nominal Length | 0.125 INCHES BOTH ENDS IN |
| Mounting Hole Nominal Diameter | 1.060 INCHES TRANSVERSELY THROUGH HUB FIRST END IN |
| Style Designator | PROTRUDING HUBS |
| Pitch Diameter | 12.5000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 4.000 INCHES BOTH ENDS IN |
| Hub Style Designator | 1 STEP BOTH ENDS |
| Spline Quantity | 10 BOTH ENDS |
| End Nominal Length | 1.000 INCHES SECOND END IN |
| End Nominal Length | 1.015 INCHES FIRST END IN |
| Nominal Outside Diameter | 12.666 INCHES IN |
| End Nominal Diameter | 3.000 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 1.000 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 |
|---|---|
| 522-4675675ITEM5 | Naval Sea Systems Command (USA) |
| 300-4684422ITEM5 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 87643-6903ITEM5 | 3/2 Design control — primary reference U.S. Government activity |
| 4675675-0005 | 5/2 Secondary reference U.S. Government activity |
| 300-4684422ITEM5 | 5/2 Secondary reference U.S. Government activity |
| 87774-3603 | D/9 Drawing number reference only U.S. Government activity |
| 87643-6903 | D/9 Drawing number reference only U.S. Government activity |
| 300-4684422 | D/9 Drawing number reference only U.S. Government activity |
| 87774-3603ITEM5 | 5/2 Secondary reference U.S. Government activity |
| 4675675-0005 | 5/9 Secondary reference Drw Mfg Co |
| 522-4675675 | D/9 Drawing number reference only U.S. Government activity |
NSN 3020-01-124-7511 is a Gear,spur, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-124-7511 has 2 manufacturer part numbers on file: 522-4675675ITEM5 (Naval Sea Systems Command), 300-4684422ITEM5 (Naval Sea Systems Command).
8 possible matches (shared part number, not a government interchangeability claim): 4820-01-158-8622, 3040-01-182-7182, 3040-01-182-7874. Verify interchangeability with system specifications before substitution.
Key specifications for 522-4675675ITEM5: Bore Nominal Diameter: 1.995 INCHES BOTH ENDS IN; Teeth Quantity: 75; Body Style: WEBBED, WITH LIGHTENING HOLES; Bore Style: STRAIGHT SPLINE BOTH ENDS. 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.