The Gear,internal, cataloged under National Stock Number 3020-01-108-4083, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-108-4083 |
| Item Name | Gear,internal |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.0065 INCHES BOTH ENDS IN |
| Teeth Quantity | 66 |
| Body Style | PLAIN, SOLID |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Style Designator | SOLID BACK RING, PROTRUDING HUB, RECESSED HUB |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 8617H ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 5.5000 INCHES NOMINAL IN |
| Spline Quantity | 23 BOTH ENDS |
| Nominal Outside Diameter | 6.5000 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 8617H OVERALL |
| Spline Pitch Diameter | 1.9167 INCHES NOMINAL BOTH ENDS IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 1400066 | 3/9 Design control — primary reference Fairfield Manufacturing Company, Inc. Dba Dana Fairfield |
NSN 3020-01-108-4083 is a Gear,internal, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5945-01-256-5686. Verify interchangeability with system specifications before substitution.
Key specifications for 3020-01-108-4083: Bore Nominal Diameter: 2.0065 INCHES BOTH ENDS IN; Teeth Quantity: 66; Body Style: PLAIN, SOLID; Bore Style: INVOLUTE SPLINE 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.