The Gear,spur, cataloged under National Stock Number 3020-01-090-9744, 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 U S Dept of Transportation Federal Aviation Administration. Government technical data includes 12 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-090-9744 |
| Primary Part Number | 40597-1 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | U S Dept of Transportation Federal Aviation Administration |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.000 INCHES BOTH ENDS IN |
| Teeth Quantity | 60 |
| Body Style | WEBBED, OFFSET, SOLID |
| Bore Style | W/COUNTERBORE BOTH ENDS |
| Mounting Hole Type and Quantity | 2 THREADED TRANSVERSELY THROUGH HUB FIRST END |
| Nominal Overall Length | 0.993 INCHES IN |
| Style Designator | PROTRUDING HUB, RECESSED BODY |
| Pitch Diameter | 5.0000 INCHES NOMINAL IN |
| Nominal Outside Diameter | 5.167 INCHES IN |
| Material | STEEL OVERALL |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 0.309 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | N |
| Part Number | Manufacturer |
|---|---|
| 40597-1 PRIMARY | U S Dept of Transportation Federal Aviation Administration (USA) |
| Reference | Meaning |
|---|---|
| 40597-1 | 5/9 Secondary reference U.S. Government activity |
| 40597-1 | 5/9 Secondary reference Datron Systems Inc |
NSN 3020-01-090-9744 is a Gear,spur, manufactured by U S Dept of Transportation Federal Aviation Administration, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-090-9744 has 1 manufacturer part number on file: 40597-1 (U S Dept of Transportation Federal Aviation Administration).
1 possible match (shared part number, not a government interchangeability claim): 6105-01-323-3698. Verify interchangeability with system specifications before substitution.
Key specifications for 40597-1: Bore Nominal Diameter: 2.000 INCHES BOTH ENDS IN; Teeth Quantity: 60; Body Style: WEBBED, OFFSET, SOLID; Bore Style: W/COUNTERBORE BOTH ENDS. 12 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.